Dual Electric 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 04-24-2007, 05:15 PM   #11
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Does the 95'* PCM have it where if the coolant temp reaches a ceartin temp, then the computer will shut off the car?
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Old 04-24-2007, 05:37 PM   #12
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not that I am aware of

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Old 04-25-2007, 03:28 PM   #13
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I believe this will identify what the relay'* belong to.


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Old 04-25-2007, 03:33 PM   #14
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Quote:
Originally Posted by BillBoost37
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.

I turned on the A/C and then had the heat on high and then lowest and the both engine fans did not turn on.
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Old 04-25-2007, 03:53 PM   #15
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I took one of the relay'* out for the cooling fans and there are 4 fins in the bottom. How do you check to see if the relay is working or not?
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Old 04-25-2007, 04:14 PM   #16
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Apply ground to either 85 or 86 and power to the other while measuring for continutiy between 30 and 87 ( or 87a, whichever has the connector.)

85 and 86 create the magnetic force that pulls the switch from 87A to 87 and connects it to 30 IIRC.
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Old 04-25-2007, 04:59 PM   #17
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I believe that'* the correct way to test a 5 pin relay. I'm trying to test a 4 pin relay, therefore pin # 87a does not exist.
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Old 04-25-2007, 07:25 PM   #18
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The only difference between the 5 pin and the 4 pin relay is that the 5 pinned ones have both a normally closed and a normally path. They are considered the universal fit relay. 30 to 87a is for normally closed and 30 to 87 is for normally open.

You can purchase the 4 pin relays in either normally open or normally closed configuration but the pins will still be labelled 30 & 87 on both kinds.
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Old 04-29-2007, 09:00 PM   #19
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Ok here'* the update, I was checking to see if there were any loose wires and this one happened to come off. I took it all apar,t cleaned up the connection and solldered it back on. I don't know if it'* a temporary fix or permanent, but it had no effect on getting the fans to run again.



Next I took off each relay and switched them around and still the fans didn't turn on. I took off one of the relays, and crossed the connector wires with a pair of needle nose pliers and the fans came on for a second, I didn't hold the connection for long since it was raining out. When I did the same for the A/C relay the clutch seemed to engage and disengage, I hope tha'st a good thing since my A/C isn't working.

Anyone have any other suggestions, I'm still thinking that it might be the relay, but what are the possibilties that all 4 relays that I was switching around are gone?
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Old 04-29-2007, 09:30 PM   #20
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It'* hard to tell from the picture, but is there another wire on the connection at the lower left? If not, that wire puts those two resistors in series. I can not see the upper left either, but try running a jumper wire from the upper left resistor to the connection on the upper right one. See if they work then. My guess is that one or both of those resistors are open.

Better yet...it looks as if there may be a resistance marking on the resistors. If so, and you have a meter, check the resistance of each.
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