HVAC fan runs continuously
#1
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HVAC fan runs continuously
The HVAC fan continues to run after the key has been removed. I searched the archives and see a few different things. The on/off switch for the HVAC works. Resistor block, Relay and Fan control module. Is there any consensus on witch one or a way to check some of these items?
Thanks
Mike
Thanks
Mike
#2
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I would try the BCM. It'* on the outside of the firewall. i replaced mine today for the exact same reason. The part was $ 104.00 at the dealership.
JLathem
JLathem
#3
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Originally Posted by jlathem
The part was $ 104.00 at the dealership.
JLathem
JLathem
I agree with the above diagonstics but tou may want to check a junkyard or someone with a parts car first. I picked up one for $25 at a junkyard.
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Yeah, 25 bucks is about 75 better than what i paid. I couldn't find one in a junk yard.
Also, that module is farily easy to troubleshoot with a volt meter.
Mine has 4 wires going to it.
Red one is Battery voltage. ( on a plug by itself )
a gray with black stripe coming rom the HVAC unit. It should have about 8 volts on high
A purple one. This should have 0 volts when off. and battery voltage on high.
I bet yours has 12 volts all the time.
Turn everything off and check that purple wire. If it still has juice I would get a BCM.
JLathem
Also, that module is farily easy to troubleshoot with a volt meter.
Mine has 4 wires going to it.
Red one is Battery voltage. ( on a plug by itself )
a gray with black stripe coming rom the HVAC unit. It should have about 8 volts on high
A purple one. This should have 0 volts when off. and battery voltage on high.
I bet yours has 12 volts all the time.
Turn everything off and check that purple wire. If it still has juice I would get a BCM.
JLathem
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fuddyduddy121:
97 SSE with ECC. I received some part numbers from GM Parts Direct. What is the difference?? Does my car have a relay along with the blower control module controlling the HVAC?
12497910 delayed blower control module
52470337 blower control module
Thanks
MIke
97 SSE with ECC. I received some part numbers from GM Parts Direct. What is the difference?? Does my car have a relay along with the blower control module controlling the HVAC?
12497910 delayed blower control module
52470337 blower control module
Thanks
MIke
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I still have the receipt from the dealer if you want me to check the part number.
I also have the ECC unit. The parts guy did mention something about a delayed unit.
I am not sure though. I can check and post part numbers when I get home from work.
JLathem
I also have the ECC unit. The parts guy did mention something about a delayed unit.
I am not sure though. I can check and post part numbers when I get home from work.
JLathem