HVAC fan runs continuously - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-18-2004, 08:11 AM   #1
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Default 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?

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Old 10-18-2004, 09:38 PM   #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.

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Old 10-18-2004, 09:57 PM   #3
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Quote:
Originally Posted by jlathem
The part was $ 104.00 at the dealership.

JLathem
OUCH!

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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Old 10-18-2004, 10:07 PM   #4
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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.

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Old 10-19-2004, 07:21 AM   #5
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Thanks Guys, I take a look sometime this week.

Mike
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Old 10-19-2004, 02:02 PM   #6
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What is the year and trim line of your car? Do you have electronic climate control?
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Old 10-20-2004, 07:26 AM   #7
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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

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Old 10-20-2004, 02:15 PM   #8
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Yes, your blower control module has gone bad. And there are no relays associated with the fan, just the module.
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Old 10-20-2004, 06:57 PM   #9
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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.

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Old 10-21-2004, 07:06 AM   #10
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jlathem:

Could you please check the PN for me. The BCM is $66 and the Delayed BCM is $264.

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Mike
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