2016 silverado fans stay on

Aug 1, 2016 · 26 posts · Joined 2016. #2 · Aug 1, 2016. I've got the same thing going on and I've asked the same. I thought maybe any performance, aftermarket parts or anything to keep the engine nice and cool but all I got was let the fans do its job. And to clean the radiator stacks. This is my first diesel so I was pretty worried that I was going to OH ...

If your Chevy Impala overheats or one of the radiator fans is not working first thing you want to check are fuses and relays responsible for power to front c...Step 3 – Check the blower motor. It could be dead. If you have inspected the resistor and it is in good shape, then root of the problem could be a dead blower motor. You have to work in the engine bay and disconnect the current motor to check its' voltage and make sure it is receiving power. If the power source isn't the issue, then the motor ...May 15, 2013 · Conditions for Running the DTC. • The ignition voltage is between 8-18 volts. • The engine speed is more than 40 RPM. • The ECM driver transitions from ON to OFF or from OFF to ON. Conditions for Setting the DTC. • P0481--The PCM detects an open circuit on the high speed cooling fan relay control circuit.Turning that knob to the left will set the system to set cooler air. Turning the knob to the right will tell the system to deliver warmer air. If you have an automatic climate control system you should set to a reasonable living room temperature and let the auto system do the work to quickly heat or cool your vehicle.For many small businesses this year, it has truly hit the fan. Many wonder: what do I do next? An upcoming webinar tackles that very important question. Has it hit the fan for you ...

Maybe try just disconnecting the positive battery cable and short it to ground for about 10 minutes. Then reconnect it and turn ignition to on (not start) and let everything come up and stabilize, and then start it. 2015 Sierra 1500 LD 2wd 4.3L V6 SCSB Silver Ice Metallic Lowered. 2015 Sierra 1500 LD 4x4 5.3L V8 SCSB Iridium Metallic Leveled.Fan still running for a few minutes after truck turned off. I drove my truck today 2019 colorado v6. It was about 50 degrees (F) outside. When I got home the fan stayed on even when the key was out I also noticed the temp gauge stayed at 160 the whole drive (basically didn't move). The fan noise is coming form the front end of the truck.Old problem and requires a 6 our coldsoak to turn the fan off when you start. Block heater is not supposed to be used above -18c but you are well below that. Look up "3.0 fan runs" on GMTechlink.com for info- you will probably have to tell your dealer how to fix it. 1957 GMC 1 ton flatbed with 22K original miles.Chevrolet with leather, without heated. without pre-crash black. MSRP $313.70. $197.59. Add to Cart. 1. Wheel Replaced by Part Number 84483765. 84483765. GM. Steering Wheel.2016 chevy silverado change thermostat and temperature coolant sensor gauge not working and coolant fan stays on - Answered by a verified Chevy Mechanic. By chatting and providing personal info, ... my coolant fans stay on after i turn off the engine of my 2014 silverado, ...2011 GMC Sierra 5.3L; Cooling fans running too much. Where the engine temperature reliably stays at 195F/90.5C the cooling fans will come on and stay on for long periods (20 mins) regardless of outsid … read more6880 posts · Joined 2015. #5 · Aug 22, 2020. There is some “hitch attached” parameters programmed into the software of the park assist module but with all of the hitch designs and heights, it’s hit or miss as to whether it will work with your particular hitch or not. 2006 Silverado 2500 4x4. LBZ.

Low voltage reading on new 2016 Silverado. So I just bought a brand new 2016 and although the truck runs great, i have noticed the voltage reading will drop down to what looks like 11 or 12 after driving for a while. No starting issues, no stalling or stuttering, nothing seems off but I just notice the gauge reading lower than what I'm used to.The engine oil temperature is warmer than a predetermined temperature. The A/C pressure reaches a predetermined pressure. If the engine coolant temperature at key-off is warmer than a predetermined value, or the A/C pressure is greater than a predetermined value, the cooling fan will operate at a low speed.2018 Chevy Silverado 5.3 cooling fans are running medium high - Answered by a verified Chevy Mechanic ... Good morning my name is***** have a 2018 Chevy Silverado 5.3 L temperature gauge is on 160 fans turn on and stay on I replaced the temperature sensor thermostat works properly ... 2016 chevy silverado fan keeps running after engine is shut ...1-remove the radiator/reservoir cap when the engine is cold. 2-start the engine and let idle. 3-turn the heater on max. 4-keep coolant on hand and add it as needed. 5-some coolant may gush out with the air. 6-keep doing this until the engine is at operating temperature and the heater is hot. 7-after the coolant settles down and the engine is ...May 13, 2023 · Does your 2014-2018 Chevy Silverado, GMC Sierra, Suburban, or Tahoe radiator fan keep running? Here are the symptoms: Fans keep running, air conditioner stop...I have a 2016 Chevy Silverado with a temperature garage that appears to be stuck on cold since yesterday. I have replaced the coolant temperature sensor, and the thermostat yesterday. ... 2012 chevy silverado after changing water pump and theromostat fans kick on and stay on. ... My heat gage stays at 160 and my cooling fan runs even after the ...

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Oct 28, 2022 · Coolant temp sensor replacement Thermostat & Coolant temperature sensor replacement: Yukon, Tahoe, Sierra, Silverado, Escalade GMhttps://youtu.be/7mJF5LQ3oPs...The 2016 Chevrolet Silverado 1500 has 3 different fuse boxes: Engine Compartment Fuse Block diagram. Instrument Panel Fuse Block (Left) diagram. Instrument Panel Fuse Block (Right) diagram. Chevrolet Silverado 1500 fuse box diagrams change across years, pick the right year of your vehicle: 2019 2018 2016 2015 2014 2013 2012 2011 2010 2009 2008 ...Oct 28, 2022 · Coolant temp sensor replacement Thermostat & Coolant temperature sensor replacement: Yukon, Tahoe, Sierra, Silverado, Escalade GMhttps://youtu.be/7mJF5LQ3oPs...The radiator cooling fan on my 2016 GMC Yukon Denali, 117,000, runs on high after start and continues to run for a couple minutes after engine is shut off. This hasn't happened before. The temp gage stayed on zero (160) after a 10 mile drive. No warning lights except oil change reminder, and it...

silentbravo. 3783 posts · Joined 2016. #8 · Jun 18, 2018. Yes PCM sends ground to the relays to activate. There are 2 pins from PCM, and there should be a small 2 pin disconnect on the e-fan/headlight harness that comes out of the PCM and goes into the wiring harness about 8" away from the fans relay block.Order Chevrolet Silverado 1500 Radiator Cooling Fan Motor Relay online today. Free Same Day Store Pickup. Check out free battery charging and engine diagnostic testing while you are in store.Possible Causes Of Radiator Fan Running When Car Is Off. One possible reason for your car's radiator fan to keep running when the engine is off may be a faulty fan relay. The fan relay plays a crucial role in controlling the operation of the radiator fan, and if it malfunctions, it can cause the fan to stay on continuously.Cooling fan relays fail when the radiator cooling fan no longer receives an electrical signal. A broken fan relay means the radiator cannot cool down. ... 2016 Cooling Fan Relay Replacement Cost. Service Location. SELECT YOUR VEHICLE. $153.53 - $245.58 ... Chevrolet Silverado 1500 V8-5.3L - Cooling Fan Relay - Phoenix, Arizona. Was very ...Turning that knob to the left will set the system to set cooler air. Turning the knob to the right will tell the system to deliver warmer air. If you have an automatic climate control system you should set to a reasonable living room temperature and let the auto system do the work to quickly heat or cool your vehicle.I have a 2014 Silverado 5.3L and my coolant temp gauge stops working on my gauge panel and my radiator fan runs wide open. I replaced the coolant temp sensor with an Autozone part on Dec.16. The problem was fixed (I thought). On Jan 4, the problem was back. Gauge bottoms out again to zero and fan runs wide open. I thought maybe …Jan 27, 2020 · This video covers the part that needs to be replaced when your GM vehicle marks no engine temperature on the dashboard. Other symptoms may be the radiator fa...23335303. GM. Grille Assembly. Chevrolet, standard, white. Helps protect radiator from debris Allows air flow to the engine compartment This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors. MSRP $835.88. $550.37. Add to Cart. 1.2014 and newer chevy silverado 5.3L. The radiator fan stays on when the engine is off. Fan runs faster than normal and run when engine is cold. Replace the t...The most common symptoms of a bad coolant temperature sensor include poor mileage, cooling fans not coming on, engine performance issues, an overheating engine, and a check engine light on your dashboard. Here is a more detailed list of the signs of a bad or failing coolant temperature sensor to look for: 1. Check Engine Light.

JohnG. 1 post · Joined 2024. #27 · Feb 16, 2024. 2017 Trax fan motor was running after turning car off. Threw code P111E. Changed coolant temperature sensor to clear code. Didn't clear code or stop the fan from running so I changed the relay in the fuse box. Fixed fan but still have code.

Cricket is more than just a sport; it’s a passion shared by millions of fans around the world. For years, these fans relied on newspapers, television, and radio to stay updated wit...Broken radiator fan. When the cooling fan fails to turn on both when the AC is on and off, the fan itself can be the culprit. The cooling fans have an electric motor inside that powers them to spin. If the motor fails, it won’t power the fan blades to spin. If only one radiator fan is working, check the other one.CHEVROLET SILVERADO RADIATOR FAN RELAY LOCATION 2006 2007 2008 2009 2010 2011 2012 2013If you have Chevrolet Silverado / Chevy Silverado and you want to see ...Broken radiator fan. When the cooling fan fails to turn on both when the AC is on and off, the fan itself can be the culprit. The cooling fans have an electric motor inside that powers them to spin. If the motor fails, it won't power the fan blades to spin. If only one radiator fan is working, check the other one.Jul 23, 2020 · 3. After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101°C (214°F) the low speed fans will run for a minimum of 60 seconds After 60 seconds, if the coolant temperature drops below 101°C (214°F) the fans will shut OFF. The fans will automatically shut OFF after 3 min. regardless of coolant temperature.The most common reasons a 2016 Chevrolet Silverado 1500 radiator fan isn't working are the fan assembly, the fan clutch, or the coolant temperature sensor. 0 %. 34 % of the time it's the. Fan Motor or Clutch. 0 %. 28 % of the time it's the. Fan Relay or Fuse.After checking wiring fans have 12 volts to them and run when jumpered to battery. Grounds checked out good. Trigger wire checks out good. Fans did not come on when engine at operating temp. Coolant temp sensor was disconnected and fans come. Replaced coolant temp sensor after engine cooled down.Massachusetts Chapter - MA April 2020 BS Thread - Stay inside and Stay Safe - Looks like we are into a new month Everyone is anxious to get outside with the …Jan 3, 2020 · Cooling fans running on high speed. I have a 2014 Chevy Silverado 1500 5.3l that I am having a issue with the cooling fans running on high occasionally. When this happens my temp gauge will read zero and when I kill the engine the fans stay on. The only way to shut them off is to crank the engine and shut it right back off.

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Jan 15, 2020 · engine temp gauge not working/air con not cold. I have a 2014 Silverado Z-71. One day I noticed the cooling fans staying on longer after engine shut off, thought nothing of it. Then one day the check engine light was on so I had the codes ran and it said it was either the thermostat or the temp sensor, but then the light went off and all was good.The fan starts running on high speed and continues to run loud about 5 min after I shut the truck off. I just got an oil change and a tune up but it's still doing it Mechanic's Ass... Have a 2015 Chevy suburban with 113000 miles. The fan starts running on high speed and continues to run loud about 5 min after I shut the truck off.2242 posts · Joined 2020. #9 · Sep 1, 2023. general rule of thumb: over heat while sitting == not enough fan. over heat while driveing = = not enough radiator. at 200k miles, i bet your rad is plugged. or bad water pump. thats really the only 2 things that can make it run warm on the highwaqy above 45 mph.New to the forum and I have an issue. 2015 Sierra 2500 SLT. I'm running led bulbs in my headlights and foglights and have been for over a year. Noticed tonight that my foglights stay on after the truck is turned off. They start off very dim and get brighter. Only way to turn them off is to pull the fuse. I'm at a loss.After inspecting the belt, there can only be two things left that could be happening: 1. The clutch is not getting a signal to turn on. This indicates some form of wiring problem. -or-. 2. The AC compressor is getting a command to turn on but is no longer able to, which would indicate that it needs replacing. 2.Getting HOT air out my vents with the A/C ON. Compressor is not running. Checked the fuse and relay for the compressor clutch. Both are good. Put A/C gauges on the Hi/Low pressure side. SInce compressor is not running, both read the same and it is at 100psi. Next step is to check for voltage at the compressor clutch and see if I have 12V there.In today’s fast-paced world, staying up-to-date with the latest entertainment news is essential. Whether you are a movie buff, a music lover, or a fan of celebrity gossip, keeping ...Step 3 - Check engine sensors. The O2 or MAF sensor could be faulty. The engine contains multiple airflow and oxygen sensors that dictate many important things that affect your engine's performance. These could also be reasons why the check engine light is on. Start by checking the MAF sensor located on the air intake of your Silverado.You'll be the coolest one in the room after you make paper fans, which can be inexpensively made. Learn more about how to make paper fans for kids. Advertisement Learn how to make ...It's usually normal for a fan still running when car is off for several minutes. This phenomenon cools down the generating engine's heat, extending the engine's lifespan. However, in case of the fan running when car is off for a long time, there are problems with the cooling system. Check related components, such as coolant level ...On average, the compressor should stay on for 4-10 seconds and then off for 15-20 seconds. However, there are many factors that affect how long the AC compressor clutch stays engaged. The main factors are the outside and cabin temperatures, engine RPM, vehicle speed, AC system design, and how hot it is outside.2013 Silverado 1500 LT, Z71, 5.3L, 6L80e, 4X4, HD Towing pkg ... The Voltage use to stay on 14 volts most of the time. It has started drooping under 12 volts and lower and the Stabiliatrac warning will flash on the dash. ... 2016 Silverado LT 4x4 Crew Cab 2017 Suburban LT 2018 BMW K1600GTL. Reactions: SFLTruck and 660catman. Save Share. Like ... ….

The 2016 Yukon Denali radiator fan won't turn off, indicating a potential issue with the fan relay or temperature sensor. This malfunction can cause the engine to overheat and result in damage if not addressed promptly. The 2016 Yukon Denali is known for its powerful engine and luxurious features. However, if you encounter a problem with the ...Good morning my name is***** have a 2018 Chevy Silverado 5.3 L temperature gauge is on 160 fans turn on and stay on I replaced the temperature sensor thermostat works properly Mechanic's Assistant: I understand that youre experiencing an issue with your 2018 Chevy Silverados temperature gauge and fans staying on, and I assure you that the Chevy ...Sold: 2016 F150 3.5 Ecoboost Screw Platinum 3.55 Full-Race GT Turbos, Intercooler, Downpipes Link to my YouTube. ... My fans don't run any more than the fans on my wife's CX9 (non-turbo). Even if the ecoboost needs more cooling the fans shouldn't need to come on much, if at all, while moving. The air going over the radiator should be enough to ...Issue with Yukon cooling fans staying on after engine is turned off. Symptoms also included AC not working. Check Engine light on with code P0128. Resolved b...Test and replace a faulty fan motor. If you suspect the fan motor is the root cause, inspect it. Start by disconnecting the negative battery terminal. After that, unplug the fan wiring harness and remove the fan from the engine bay. Get a battery and jumper cables and test the radiator fan motor using a multimeter.2015 Chevy Silverado Radiator Fan kicking on and won’t go off for 5 min after engine shuts off. Temperature gauge is not working. Stays at 0. ... Replace the thermostat. A p0128 fault commands the fans to high and has the temp gauge read 0. Clearing the code will have the temperature read correctly which shows the sensor is working.For 2013-2016 ford escape purge valve dorman 81475ms 2014 2015 1.6l 4Purge partsgeek Purge motorcraft partsgeekFor 2009-2019 ford escape purge valve motorcraft 23542kr 2010 2011 2012. Ford escape purge valvePurge valve for 2013-2015, 2017-2018 ford focus 2014 n741fh . For 2013-2016 Ford Escape Purge Valve Dorman 81475MS 2014 2015 1.6L 4 Check ...19209792. GM. Mini Fuse. Instrument panel passenger side. 10 amp. Engine compartment. micro 2-blade 10 amp. Instrument panel. micro 2-blade 10 amp. Engine compartment. with 32 Volt 10 amp. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors. MSRP $3.52.I've never owned a Tahoe before, I did however own a 2016 Silverado with the 5.3 a few years ago and never noticed anything like this. My first thought was maybe ascending up the mountain pass it got a little hot and the fan is designed to keep running until cool, but I'm just guessing. 2016 silverado fans stay on, There are three cooling fan relays. One could be bad. As far running on a low speed, it should change as needed. Now, when the engine is at normal operating temp, neither fan should be on unless the AC or defroster is on. Once one of those things are selected, it will turn the fans on. Here are the directions for testing the relays., Sharp Admin. Your radiator fan should kick in at about 200 degrees Fahrenheit. If you notice your vehicle is overheating or at the very least running hotter than it normally does, listen for the fan to see if you can hear it. If you can't and it doesn't turn on eventually, Doc Motor Works can repair or replace it to keep your engine's ..., TV show fans have all sorts of theories about their favorite shows. See 10 creepy TV show fan theories to what wild tales are out there. Advertisement Most TV shows are chock-full ..., Boatguy272 Discussion starter. 54 posts · Joined 2020. #1 · Feb 28, 2022. This has happened to my truck twice in 6 months. The fans went to full speed and stayed there until I shut the truck off. Not sure if there is a temp sensor going bad, or maybe a relay. Anyone run into this yet?, Why would my fans be running high when my trucks off in a 2016 Chevy Silverado 1500 and I've changed my temp sensor ... BS engineering. 17,094 satisfied customers. My coolant fans stay on after i turn off the engine of my. my coolant fans stay on after i turn off the engine of my ... 2014 Chevy 1500 Silverado V6 radiator cooling fan keeps ..., 5. If a normal temperature can ge reached, the new engine coolant thermostat appears to be leaking and defective. Ask Your Own Chevy Question. When the fans are on the gauge doesn't move from the bottom. But when the fans stop the gauge temp records a normal temp of about 240. Chevy Mechanic: jim., The 2016 Silverado 1500 serpentine belt is responsible for transmitting rotational engine power to auxiliary systems like the AC compressor, alternator, and water pump. If the belt breaks, these crucial systems will not work and you will not be able to drive, so it's important to keep an eye out for signs of wear like damaged ribs, abrasions ..., AT WHAT TEMPERATURE RADIATOR FAN TURNS ON CHEVROLET CRUZE, CHEVY SONIC, HOLDEN CRUZEIn this video we will show you at what temperature the radiator fan / coo..., May 4, 2023 · 3. Bad ECU Unit. Your Chevy’s engine control unit signals the fan when to turn off or keep running. A defective ECU will result in the fan not knowing when to stop running. 4. Low Coolant Level. The car coolant is the liquid that removes heat from the radiator. The lower the coolant level, the less effective it’ll be., The radiator fans on my Chevy Silverado 1500 stayed running when I shut the truck off. I tested the rad fan relays, fuses, and coolant temperature switch. I ..., 2015 silverado 5.3 coolant temp sensor keeps going out. As the title says. Last week my coolant temp sensor went out, replaced it, next day I made about 9 miles before I watched the gauge bottom out, when that happens the cooling fans kick on full tilt. I replaced the sensor again with another OEM one and the next day it went out again., The ECM badly ever fails, so let's look at why the ECM would command the fans on. The ECM reacts to inputs, in this case, the information from the temperature sensor. So, it would have to be a problem with the engine temp sensor, or the wiring to the sensor. Ray. '09 Avalanche LTZ - 5.3 - 4x4 - Black. Like. Gunny81 Discussion starter., The engine fan staying on is a common issue that can be caused by various factors, including sensor failures, voltage problems, thermostat issues, and climate control settings. This comprehensive guide will provide you with the technical details and specific data points to help you diagnose and resolve the problem effectively., Install the new buttons: Connect the wire connections to the new buttons and secure them in place using screws or clips.; Reassemble the trim panels: Snap the trim panels back into place, ensuring a secure fit.; Cause 3: Sticky Steering Wheels Button. The steering wheel buttons in the Silverado are convenient for controlling the radio system.However, if one of the buttons becomes sticky due to ..., Asked by Guru9DHRBX Nov 07, 2020 at 11:33 PM about the 2015 Chevrolet Silverado 1500 LS Crew Cab RWD. Question type: Maintenance & Repair, The 2014 Chevy Silverado cooling fan relay is located in the engine compartment which is on the right-hand (driver) side under the hood. There are two associated relays and they are numbered twelve and thirteen. Symptoms You may experience if Your cooling fan relay is going bad include: overheating of the engine, fans no longer run. Fans continue running even after the engine is shut off, poor ..., 3. After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101°C (214°F) the low speed fans will run for a minimum of 60 seconds After 60 seconds, if the coolant temperature drops below 101°C (214°F) the fans will shut OFF. The fans will automatically shut OFF after 3 min. regardless of coolant temperature., 🔧 Experiencing the frustrating issue of your radiator fan refusing to turn off in your 2014-2019 Chevy Silverado or GMC Sierra? You're not alone! In this de..., Ok. Looked everywhere and can't find anything about this. My radiator fans are all out off whack (simply put). They. run from the time i turn the truck on to the time I shut it off. BUT sometimes they'll shut off for about 30 seconds to 2. minutes and kick back on. Slow then fast then back to., Learn why your radiator fan stays on all the time and how to fix it in this video. Watch more car repair tips and tricks on YouTube., If you have something like torque or a scanner, check for codes or read the ECM temperature output. In my case there was a p0128 that wouldn't set a CEL as well as the ECM recognizing operating temps around 160 degrees. 2019 Z71 CCLB Pacific Blue Metallic. Other/former rides: 84 corvette (101k miles), 04 trailblazer LS (220k miles and …, 2015 GMC Sierra 5.3. The other day I noticed my radiator fans constantly running at full blast and staying on for 5 minutes after shutdown - saw that the coolant temp gauge was pegged low. I replaced the coolant temp sensor and the problem is still there. Looking at the live data on my OBDII scanner, I can see that the coolant temp is reporting ..., O'Reilly Auto Parts carries a selection of new A/C clutch cycling switches, refrigerant, A/C compressors, and refrigerant oil for a complete repair. Show More. Show Less. Shop for the best Radiator Fan Relay for your 2014 Chevrolet Silverado 1500, and you can place your order online and pick up for free at your local O'Reilly Aut., My 2016 chevy silverado has been struggling to turn over at start recently I would like to connect a 12 volt chrger just wodering if hook up is same as old style positive to positive post negative to ... The engine cooling fans appear to be turning., Cooling fans staying on after shutting engine off. I have a 2018 Silverado 1500 5.3L. The cooling fans just recently started staying on after I shut off the engine. The temperature gauge stays around 165 degrees, even while driving. The A/C also started blowing warm air. I don't see any coolant leaks and I replaced the coolant temperature sensor., 5107 posts · Joined 2015. #6 · Nov 2, 2016. ^^^+1. During the end of Chevy truck month they gave me 12k off right off the bat. I like the courtesy reverse lights personally. Ceramic/Undercoat-Leer-BedRug-Morimoto-Winjet-Lamin X-Kenwood-Dark Audio-Rockville-Focal-Rockford-Sundown-Lewtune-Llumar-Airaid-TeamRXP-Diode Dynamics-Halo-DynoMax-Carven ..., The truck has 205K miles on it, and it has been a good truck. I bought it new in 2005. This past week, I had to jump start the truck, since the battery was dead. After jumping it off and driving it, I got home and noticed the electric fans staying on after the engine is off and keys out of the switch. So that drained my battery., The sensor had failed, making the gauge read "0". As a failsafe since it has no idea what the actual coolant temp is, the PCM commands both fans on high speed and keeps the A/C off to prevent extra heat from the condenser. It also runs the fans for about five minutes after the key is turned off. Watch the first eight minutes of this veideo:, The cooling fan can be running all the time due to short relays. Short relays cause the power to stay on all the time and keep the fan running too! 5. Dirty Fan. The intercooler fan can get dirty when driving on rough roads. Snow or mud will cause the fans to disbalance. To rectify this, you can use a garden hose., 19209792. GM. Mini Fuse. Instrument panel passenger side. 10 amp. Engine compartment. micro 2-blade 10 amp. Instrument panel. micro 2-blade 10 amp. Engine compartment. with 32 Volt 10 amp. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors. MSRP $3.52., A feature in the computer called "afterblow" may have been enabled. It watches the car as it is being driven for things like AC operation, outside temp, etc. Then, after the key is off for about 5-10 minutes, it'll run the HVAC fan for a few minutes. This helps dry the heat exchanger so it doesn't grow as much mold or other biologicals, which ..., Things that make fans run on high speed. MAX A/C. overheating condition (low coolant) Perhaps bad temp sensor would trick it to think fans needs to run on high. A/C system malfunction (goes into high cooling mode). The A/C high-side pressure is incorrect, therefore triggering the high speed fans., 224. 61K views 4 years ago. This video covers the part that needs to be replaced when your GM vehicle marks no engine temperature on the dashboard. Other symptoms may be the radiator fan that...