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Fan Stays Running - Feature or Malfunction?

damnthetorpedoes

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damnthetorpedoes Enthusiast

damnthetorpedoes

Posted
Posted

My cooling fan(s) occasionally stay running after the truck is turned off. I've noticed this twice now and only happens when shutting the truck off after some spirited driving. Both times the temp gauge has been above 210 (slightly) at the time of shutdown. I waited about 5 min and the fans were still on so restarted, let run for approx 1 min and shut down. The fans turned off at that point. 

Is this a feature to cool the engine after it is shut down, or do I have a relay or programming issue somewhere?

nluchau Enthusiast

nluchau

Posted
Posted

I have never had my cooling fan run after a turn off of the vehicle.  I have noticed it come on directly after I start the vehicle if its warm then it goes off after a short time.  This is on my 5.3.  6.2's might have other metrics as to when the fan runs?  

Lsgun1 Enthusiast

Lsgun1

Posted
Posted
31 minutes ago, sk said:

It is a GM feature called "afterblow" (no I didn't make that up).  It is meant to dry the evaporator core so you don't get that moldy smell from your A/C.  On some years it came already enabled but on others the Techs had to enable it later after people started to complain about it.

 

https://www.underhoodservice.com/gm-eliminating-air-conditioning-odor/

 

He is saying the engine cooling fan stays running, not the HVAC fan.

garagerog Enthusiast

garagerog

Posted
Posted

OP,  it's a Feature, normal, been that way on many vehicles across the board for years now.  If it bothers you that bad, shut off your a/c during the last 5 minutes of your drive and sweat it out.

rah7777777 Enthusiast

rah7777777

Posted
Posted

He's talking about the engine cooling fan under the hood. 

 

NOT the HVAC blower

 

But I would assume its normal. Probably shuts off withing a couple minutes. Lots of cars do that in the hot months. 

16LT4 Enthusiast

16LT4

Posted
Posted

I've noticed the ENGINE FAN remaining on sometimes on a hot day in every electric fanned vehicle I've ever had.  You're fine.

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