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Chevy C1500 Blowing Cold, no High

banks13cu on Sat October 13, 2007 11:33 PM User is offline

I have a 1995 Chevy C1500 V6 and I had to replace the blower motor in it because it went out on me. Now I have more issues... First, when I turn the heat or air on I have Lo, LoMed, HiMed, but High does not work on either heat or a/c. Secondly, when I switch the unit over to heat it continues to blow cold air. If I turn the A/C switch on the air seems to get colder...I know the A/C is working because the compressor lines get cold in the engine compartment, so its functioning.

any ideas?

thanks in advance

Chick on Sun October 14, 2007 6:13 AM User is offlineView users profile

Blower motor relay or resistor (Resistor located in the path of the blower motor which keeps it cool) I think the relay on those are under the hood.. As for just cold air, make sure the vacuum lines are not broken cracked or disconnected either under the hood, or on a blend door/controller. Next feel the heater hoses where they enter the cab, if they are not hot, check your antifreeze level cause no water is getting into the heater core.... Was any work done to the truck recently?? Maybe something got disconnected and didn't get put back??

Email: Chick


Freedoms just another word for nothing left to lose

NickD on Sun October 14, 2007 9:13 AM User is offline

Two problems, first is the blower motor high speed relay either not getting 12V from the blower motor switch or the contacts are fried, also has it's own 30 amp fuse, not very complicated.

Second is, with a hot engine, both heater hoses must be hot, if the air is cold with hot hoses, you have blend door problems. did you have the climate control panel off? That little plastic tab that operates the blend door breaks off very easily.

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