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Old 02-20-2014, 04:18 PM   #1
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Default 94 cutlass supreme radiator fan

only 1 of my fans seems to be working, what should i check?
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Old 02-20-2014, 07:20 PM   #2
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Welcome to the forum Paul!
Are you having cooling problems as in the car getting hot above 210F?

If your car is so equipped with air conditioning, turn to defrost or air cond mode and see if both fans are spinning now ...even slowly...
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Old 02-20-2014, 07:23 PM   #3
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I think there are 2 separate relays and the PCM controls both of them separately. I think the PCM uses fan one mostly and If the engine reaches 225 it will kick in the second fan.



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Old 02-20-2014, 07:40 PM   #4
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thanks, i was wondering if both fans operated at the same time all of the time, I have no overheating issues, i just noticed that only one fan went on when I had the engine running with the hood up
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Old 02-20-2014, 07:56 PM   #5
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Quote:
Originally Posted by lontimecoug View Post
thanks, i was wondering if both fans operated at the same time all of the time, I have no overheating issues, i just noticed that only one fan went on when I had the engine running with the hood up
With the engine up to operating temps, turn on the A/C to Max, full cold blower on Max. That should trigger the Second fan to come on. You will hear the sound difference of the car at idle with both fans running.

If no fan, and your A/C works, check the relay. 4 pin relay would be power, power, ground 'Exciter' wire. The Exciter turns on the relay passing the positive side from one terminal to another.

If you just add power to the proper terminal the Relay will activate if good.

One OBD I cars when the cooling fans will not turn on do to lack of ECM signal you need to replace the ECM & Proms. Most parts stores sell you a ecm that you must re-use your proms in. The 1988-1995 OBD 1 W cars all have ecm issues for cooling fans.

I have on cars NOT worth putting a new ECM/E-Prom(*) in: run a wire on a toggle switch from the dash to the Exciter Terminal of the relay. Last one was a 1991 Grand Prix that would not turn on the primary cooling fan.

It is always best to repair these cars properly, and replace bad items. Yet if the car is on borrowed time and a might get crushed in a year, keeping the engine from overheating via any means is acceptable.
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Old 02-20-2014, 08:34 PM   #6
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The second fan kicks on at 225. I have a 94 CS as well and mine runs one fan most of the time. I tuned my second fan to come on at 210, for better cooling. 225 seems way to hot to me.
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Old 02-21-2014, 10:00 AM   #7
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i wouldnt think you would ever get to 225 around here unless it was august and you were driving in the city
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Old 02-21-2014, 04:05 PM   #8
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Once is the 5 years I have owned my car it got to 225. Shorty after that I had it tuned, but now it doesn't get above 210.

I was in downtown Detroit traffic on a 101F day with the AC at full blast.
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