¿Cooling Fan Resistor(s) or Electrical Anomaly? - 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 05-25-2006, 11:37 PM   #1
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Default ¿Cooling Fan Resistor(*) or Electrical Anomaly?


My stock 92 SSE will stop running when the ECT (Engine Cooling Temp) reaches right around 220° and will not start until the ECT drops to about 150°.

First I check the coolant level and added some antifreeze to the overflow resevior. This had no noticable effect.

Next I installed a new 180° thermostat - All that did was to buy a couple more minutes before reaching the ‘shut off temp’ of approximately 220°.

I'm scratching my head while looking at the engine when all at once - ‘doh’ what about the cooling fans, are they running at all? Come to find out they are not. I checked fuses - they're ok; I tested both relays & they behave as expected. I checked electrical connections at the cooling fan motor - no corosion.

I decide to try the procedure described by DeathRat in TechInfo for retreiving ECM/PCM codes. Much to my chagrin no codes - but what'* this I hear coming from the engine compartment; why yes it'* the cooling fans just spinning their little hearts out. However, as soon as I remove the short between terminals ‘A’ & ‘B’ of the ALCL, or if I start the car, the cooling fans will stop running. This is not an expected behavior is it?

Could it be the resistors, or is it something more sinister?

I need to check for voltage at the cooling fan motors - I'm guessing when the ECT climbs to a little over 200° there should be a voltage, right? just put the multimeter leads on the plug ~ I don't have to put the negitive to the frame for ground do I? What about listening for the relays to click?
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Old 05-26-2006, 09:34 PM   #2
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You may want to check out this link:


It'* a previous post about a full time fan switch. It is sorta along the same lines. It does sound a lot like an issue with the resistors to me. If you are checking power to the resistors, you can ground it to the frame. The power wire is full power all the time and only kicks the fans on when it is grounded. Also, the high speed fans kick on about 220 degrees. I don't have any answers for you, but I got tired of my car running hot and installed the full time fans. I haven't had a problems since. Oh, one more thing. Before I installed the fan switch, unless I had the ECC running the fans would not turn on until 220 degrees. Opposite the problem you were having. No answers here, just observations.
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