Frustrated with Dual Fans Not Working - 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 05-05-2007, 11:11 PM   #11
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Both CTS'* check close to each other at varying temps. I guess I need to buy a digital VOM rather than using this antique meter @ 1K scale.

215 degrees - 200/200 ohms
200 degrees - 210/220 ohms
180 degrees - 300/310 ohms
160 degrees - 500/500 ohms

Plus my fingers are nearly fried from getting access to the CTS under the TB
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Old 05-06-2007, 11:43 AM   #12
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The fans should come on when the engine temp hits about 215. The coolant temperature sensor (CTS) should have a resistance of 180 ohms at 212 degrees. The resistance would have to be around 160 -170 ohms to turn on the fans. Since both of your sensors are reading 200 ohms at 215 degrees either both sensors are bad or the engine wasn't as hot as you thought.

You could go to Radio Shack & get some resistors to experiment with. Connecting a 180 ohm resistor to the wires for the gauge'* CTS will show the point where the fans are about to turn on. Connecting a 160 ohm resistor to the wires for the PCM'* CTS should turn the fans on in low speed mode. Connecting a 130 ohm resistor should turn the fans on in high speed mode.
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Old 05-06-2007, 11:54 AM   #13
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Here'* a link with the temp/resistance data. You can also use the resistors to check your meter.
http://www.pe-ltd.com/Downloads/coolant_temp.pdf
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Old 05-06-2007, 12:13 PM   #14
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And here'* our very own super-de-dooper Techinfo article that we've had for 4 or 5 years.

http://www.bonnevilleclub.com/forum/...e=article&k=24
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