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Brandon, ASE certified GM technician
Category: Chevy
Satisfied Customers: 48
Experience:  GM dealership technician, ASE master certified, world-renowned tech/automotive college graduate
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2004 gmc: blows hot air..pulling..air conditioning relay switch

Resolved Question:

my 2004 gmc sierra airconditioning blows hot air after it has been running- pulling a load for a short period of time - is there an air conditioning relay switch or something wrong with it.
Submitted: 8 years ago.
Category: Chevy
Expert:  Brandon replied 8 years ago.

what i have seen is that the perssure swtich on the rec>drier is bad or going bad next time this happens find this sensor and hit it lightly and see it a/c comes back on if so replace

this is the right side of engine bay next to the fire wall

Object Number: 660417  Size: SH

Customer: replied 8 years ago.
Reply to Brandon's Post: That isn't it - we unhooked the present pressure switch and hooked it back up and the ac works fine...the hot air comes out after we have been pulling a load(stock trailer) and only on the drivers side. usually the passenger side continues to blow cold air.
Expert:  Brandon replied 8 years ago.
It sounds like it is a temp mode actuator losing it's memory, so it goes to default. You will probably need to replace that actuator.
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