'92 LeSabre Cooling Fans Always On (even with ECC Off) - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-18-2012, 09:50 PM   #11
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Swapped the two fan relays (the two on the right) today
for two from the same slots on a '92 Park Ave..
Fans still always on, even when dead-cold.
The skewed coolant temp sensor theory sounds plausible, because there'* no SES..
Not to sound stupid, but this being my first 3800 - Where is the coolant temp sensor?
Is it the item under the throttle body with the wires running from it?
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Old 04-18-2012, 09:56 PM   #12
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Old 04-20-2012, 07:55 PM   #13
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Excellent pic!

Thank you
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Old 04-26-2012, 08:16 PM   #14
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I went ahead and replaced the coolant temp sensor, as I found the plastic part of mine to be cracked.
Cooling fans still roared to life on cold start..

Then swapped out the two cooling fan relays, no change..

Turns out a friend of mine has an OBD scanner - No trouble codes found.
We then fired 'er up to get some readings while it was running-
All was well, everything was within parameters.

It had been running a few minutes when he pointed out that the engine was operating in Open Loop.. Just few seconds after he said that, it switched to Closed Loop. I noticed that things got quieter underhood..
The fans had shut off when it went into Closed Loop.

We kept 'er running and waited as the coolant temp increased - At about 219 (as I recall) the fans kicked on (both, running at what seemed to be low speed). After they had run a few minutes, they kicked off at about 214 (as I recall).

Apparently when the car is first started and the engine is cool, it operates in Open Loop for a few minutes until warming up a bit, then switches to Closed Loop. The fans must run on High when in Open Loop, then operate normally as it enters Closed Loop.
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Old 04-26-2012, 09:19 PM   #15
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odd.... i've never seen fans act that way based on fueling...
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