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Old 04-24-2007, 02:00 PM   #1
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Default Dual Electric Fans Not Working

Now that the warm weather is out, I've noticed that the water temperature at idle has gone up to approximatly 235 degree F. When the car is in motion it settles down to around 175 F. I have a drilled out 180 state and while the temperature at idle is at the 235 F mark the dual fans in front of the rads aren't working.

Any suggestions?

Where is the fuse and relay for the fans, I can check that first.?
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Old 04-24-2007, 02:06 PM   #2
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First we need to know if you are really at 235F.... Fan turn on is around 220-227F generally... But we have seen many of the temp gages that were off... Mine looks like 160F when in fact I am at or over 180F... Its really strange... also we don't see too many cooling system failures on the Bonnevilles and other H Bodies.. Not sure what going on Frank.. We might have you car in the Bonnevilla shop for a while..lol

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Old 04-24-2007, 02:13 PM   #3
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Thanks for the reply jr, , for the time it'* been on the road (6 months) I've never seen that fans operate, mind it was November when I started driving it. The outside temperature when the gauge was at 235 F was 60 degrees F. I would assume it would go even higher if I let it idle longer and or the outside temperature was even higher. Another thing I noted was that after idle and the temp. being at 235 F the overdrive didn't work. When the temperature went down to 175 it finally worked again.
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Old 04-24-2007, 02:45 PM   #4
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Sounds like things are getting too hot.. The 94-95 PCM watches trans temps... If you had no OD that the trans surpassed 260F... You may very well have some cooling issues..

when you go to NEBF will you hit any traffic?

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Old 04-24-2007, 03:01 PM   #5
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Never been to NEBF before and Mick and I are driving alone mostly at night. I know for a fact that we'll be at the boarder at around 5:00 pm and there will be traffic for sure.

If somone can tell me were the relay and the fuse is, I can check it. I beleive the relay is a black box? Is it located somewhere on the firewall?
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Old 04-24-2007, 03:06 PM   #6
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Frank there are actually 2 relays.. One for low speed the other for high speed.. we need to find the schematic for you..

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Old 04-24-2007, 03:54 PM   #7
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Passenger side relay center on firewall. There'* three there I think... AC low speed and high speed.

If you turn the ac on (I know..do it ianyway) and set the temp to 60 the fans should try and come on automatically.
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Old 04-24-2007, 04:25 PM   #8
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Thanks Don and Bill, Mick took the car to his part time job and will be home tonight at 11:00pm so I'll check in the morning. So Don, it'* normal for the OD not to work if the car is overheating then? I also noticed that when I was on the highway, the OD still didn't work when the car went down to the normal temperature. The next time I drove it, it worked fine and has ever since. It only doesn't work when the car over heats.

Thanks Guys.
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Old 04-24-2007, 04:56 PM   #9
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Yes its normal for the PCM to try to do what it can to save the trans..

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Old 04-24-2007, 05:14 PM   #10
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Hip Hip Hurray for the PCM, all hail to the PCM.



Hail master Hail.
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