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Registered User
Join Date: Oct 2019
Posts: 3
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cooling fans
Iam working on 1977 924 cooling fans .Only the right fan works. I have supplied power to left fan and it runs, checked grounds. car has new relay ,sensor in radiator tank and resistor. Any thoughts ? also right fan runs on low speed only
Last edited by Grounder; 11-21-2019 at 10:54 AM.. |
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11-21-2019, 10:39 AM
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Registered
Join Date: Feb 2009
Location: Park Hills, KY
Posts: 2,459
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working on a similar issue with a 83 944. tested fans and jumpered the wires connecting to the temp switch on radiator.
both fans run when I put power directly to each, but when I jumper the temp switch leads I only get the left / drivers side fan to run. so replaced the temp sensor but have not had the car running yet doing several other things. Quote:
good luck.
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Bob Cox 78 930 clone project car. 87 924S resurrect at some point. 84 928S, Ruby Red linen/brown interior - sold  86 944 turbo my new DE/track car - sold
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11-22-2019, 04:54 AM
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Registered
Join Date: Feb 2009
Location: Park Hills, KY
Posts: 2,459
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when researching my cooling fan issue, never could find an explanation of how they should operate.
did find a post that when the coolant temp reaches a point, based on the temp sensor you use, one fan should turn on at moderate speed. and with the AC on, both fans should operate at high speed. what I could not find is if/how/when just high coolant temp and AC off will cause both fans to come on. I had expected that when I jumpered the connectors to the rad temp switch, but only got the one fan running at moderate speed. have not had car running yet to test what happens with AC on, or when coolant temp gets high enough. when building my 951 track car, I ran a set of wires to the connectors for the rad temp sensor. when I flip the switch I installed on the dash that closed that contact, both fans would run at high speed. it is an 86 turbo so maybe it works differently than earlier cars. anyone?
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Bob Cox 78 930 clone project car. 87 924S resurrect at some point. 84 928S, Ruby Red linen/brown interior - sold 86 944 turbo my new DE/track car - sold
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11-22-2019, 08:55 AM
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Registered
Join Date: Mar 2008
Location: Nashville, TN
Posts: 4,049
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Early cars:
When rad switch is activated, both fans run full speed with ignition on, and slow speed on 1 motor only with key off. Late cars have 2 set activation points in the fan switch-- lower temperature runs both fans at low speed, higher temperature runs both fans at high speed. Key on or off. When ac is engaged with ignition on, both fans run at high speed regardless of model year or rad temperature |
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11-22-2019, 02:29 PM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,884
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A/C has to be functional too. My fan operation didn't work properly as well, a/c system was good, minus 12v to the clutch, it was the a/c amplifier board. It's under the kick panel on the passenger side.
It's about the size of an index card, 1 inch thick. Crack the box open, find the burnt trace, solder, good to go.
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83 944 91 FJ80 84 Ram Charger (now gone) Last edited by mattdavis11; 11-23-2019 at 12:35 AM.. |
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11-23-2019, 12:30 AM
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Registered
Join Date: Feb 2009
Location: Park Hills, KY
Posts: 2,459
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Ahhhh.... cant recall now if key was on or off. thought on but will test again when I am ready to start it up again.
thanks.
__________________
Bob Cox 78 930 clone project car. 87 924S resurrect at some point. 84 928S, Ruby Red linen/brown interior - sold 86 944 turbo my new DE/track car - sold
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11-24-2019, 05:39 AM
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