Frustrated with Dual Fans Not Working - 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 05-05-2007, 12:12 AM   #1
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Default Frustrated with Dual Fans Not Working

FIrst of all:

92 SSE, L27
Fans work at start-up, short cycle then stop
Fans work when A/C is turned on
Fans work when I jumper the CTS underneath the TB
Replaced the PCM but used my EPROM
Replaced the CTS with a Wells #SU109 (AutoZone)
Fans work when I jumper the A-B terminals on the ADL (could be a problem according to service manual?)

Fans DON'T work when the temp rises above a gage reading of 225+
Don't have low or high under "normal" operation.

I'm almost ready to take it to a stealership!

Any suggestions?
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Old 05-05-2007, 10:24 AM   #2
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If the fans run when you installed a jumper for the CTS then I would change the CTS.

Edit - I see you already changed that. Do you have a multimeter?
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Old 05-05-2007, 10:32 AM   #3
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Yup. Compare the resistance of each of the two CTS'*, and report the readings back here. Make sure we know which reading goes to which sensor.

Do your fans come on high when you put your climate control in AUTO? (assuming you have the ECC, and not the manual controls).
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Old 05-05-2007, 11:02 AM   #4
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I don't know if this will help any but my fans don't come on until the gauge reads 239-240 I checked it with my scan tool and my gauge is way off. At 200 gauge (car) it reads 190 (scan tool), at 240 gauge (car) it reads 210 (scan tool).
Are you sure your gauge accurate?
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Old 05-05-2007, 11:08 AM   #5
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This has nothing to do with the gauge. The gauge operates off a different sensor than the PCM/fans.

Series 1 cars all have two seperate sensors.
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Old 05-05-2007, 01:40 PM   #6
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92 SSE has the ECC
Fans do come on when switched to AUTO.
SSE has 206K mostly reliable miles
EPROM code "AZKN"

Ohm readings (with old needle VOM) with dash temp gage readings +/-?

220 - 175 ohms
200 - 200 ohms
180 - 250 ohms

Makes me want to install the EPROM from the other PCM I put in "BDNL" to see if the temps(ohms) are programmed into the EPROM. Maybe I had a shift inside the AZKN chip?
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Old 05-05-2007, 01:48 PM   #7
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You need to check the resistance of both temperature sensors.
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Old 05-05-2007, 01:49 PM   #8
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And compare them to each other.

Please tell us what the gauge reads, and the resistance of each temp sensor. Specifiy which is which. Below the TB and next to the #6 fuel injector.
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Old 05-05-2007, 02:06 PM   #9
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Readings were from the CTS under the TB.

Now checking the CTS by #6 cylinder
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Old 05-05-2007, 02:13 PM   #10
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Please check them both at the same temperature, and tell us what the gauge reads at about the same time.
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