Blower Fan Diagnostics - Page 2 - 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 03-12-2004, 05:54 PM   #11
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Default Re: Blower Fan Diagnostics

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Originally Posted by Allmachtige
My blower fan for my climate control stopped working and I tried the following.
First off I test voltage at the harness and still got 9.5 volts on high speed, then I applied direct 12v from the battery and the fan started right up. All fuses and relays related to the blower check through fine. So what can it be? Blower module doing wacky things or what?
I'd expect high speed to be giving a full 12-14 volts at the motor, not 9.5. You're sure that you had a good tester connection when measuring that voltage, right? If so, the resistor pack or blower controller (depending on whether you have the manual or electronic climate controls, respectively) may be failing on you.
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Old 03-12-2004, 07:07 PM   #12
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I agree, it should be higher, but the fan should still run at 9.5V, too. His fan is completely off.
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Old 03-13-2004, 06:27 AM   #13
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To get the 9.5v reading I just stuck the positive and negative pointers of the multimeter into the respective pins on the harness connector that connects into the fan.

How do I locate the blower module/controller?
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Old 03-13-2004, 11:40 AM   #14
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It'* located in the center rear of the engine compartment, below the passenger side underhood fuse block.
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