Cooling Fans Issues -86 944na
07-26-2021, 08:58 PM
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Cooling Fans Issues -86 944na
Alright, ill try to be thorough with the description of my issue, and hopefully you guys can help me out.
1986 944na. LHD
Hit a raccoon about a week ago at around 60mph, hit the front right valence, busted foglight, and bent a couple of the brackets the valence bolts onto.
Get home and take off the valence, go to straighten one of the brackets in front, and accidentally puncture my condenser (not a good moment), emptying my ac system of the R-134.
Go to take it for a quick drive, as it still runs and drives fine, and upon idling up my driveway, I notice that my temp is creeping up and up, and no fans coming on (they had been working perfectly prior to the raccoon run-in)
Well ****. After performing Clark's test by jumping the pins on the plug that goes into the thermoswitch, all signs point to the thermoswitch being bad: relay passed with flying colors, turned the fans on and off as it should.
Replaced the thermoswitch the other day, and fans are still not coming on, even when idling up over the second white line on the temp gauge.
I know my fans physically work, I know my relay passed the Clarks test, although maybe it could still be bad (although that would seem unlikely to me), my coolant system is bled well with no air bubbles, and I have a new thermoswitch installed.
in my mind, it can't be a coincidence that my fans stopped right after hitting the raccoon, and emptying my AC system (oops). Given that none of the fan wiring runs on the right side of my car, I don't really see how the impact would have affected my fans functionality. I also don't understand how emptying my AC system would have led to the fans not working, as it is a separate system. (fans do still turn on at low speed when I turn the AC on). Currently when cruising on the highway, in 85F temps, my temp stays right above the first line on the temp gauge, so stays in a normal range as long as I am moving.
I am beginning to think the thermoswitch I put in could maybe be bad, because if the clarks method of testing the plug by jumping it shows that everything down the line from the thermoswitch is doing its job, that would point back to the thermoswitch being the issue. I am having my ac serviced this Thursday, but I don't expect my fans to come back on when my AC is fixed.
Hopefully someone could shed some light on any ideas of what my issue may be, or have input for how to run tests to find whats wrong. Thanks
1986 944na. LHD
Hit a raccoon about a week ago at around 60mph, hit the front right valence, busted foglight, and bent a couple of the brackets the valence bolts onto.
Get home and take off the valence, go to straighten one of the brackets in front, and accidentally puncture my condenser (not a good moment), emptying my ac system of the R-134.
Go to take it for a quick drive, as it still runs and drives fine, and upon idling up my driveway, I notice that my temp is creeping up and up, and no fans coming on (they had been working perfectly prior to the raccoon run-in)
Well ****. After performing Clark's test by jumping the pins on the plug that goes into the thermoswitch, all signs point to the thermoswitch being bad: relay passed with flying colors, turned the fans on and off as it should.
Replaced the thermoswitch the other day, and fans are still not coming on, even when idling up over the second white line on the temp gauge.
I know my fans physically work, I know my relay passed the Clarks test, although maybe it could still be bad (although that would seem unlikely to me), my coolant system is bled well with no air bubbles, and I have a new thermoswitch installed.
in my mind, it can't be a coincidence that my fans stopped right after hitting the raccoon, and emptying my AC system (oops). Given that none of the fan wiring runs on the right side of my car, I don't really see how the impact would have affected my fans functionality. I also don't understand how emptying my AC system would have led to the fans not working, as it is a separate system. (fans do still turn on at low speed when I turn the AC on). Currently when cruising on the highway, in 85F temps, my temp stays right above the first line on the temp gauge, so stays in a normal range as long as I am moving.
I am beginning to think the thermoswitch I put in could maybe be bad, because if the clarks method of testing the plug by jumping it shows that everything down the line from the thermoswitch is doing its job, that would point back to the thermoswitch being the issue. I am having my ac serviced this Thursday, but I don't expect my fans to come back on when my AC is fixed.
Hopefully someone could shed some light on any ideas of what my issue may be, or have input for how to run tests to find whats wrong. Thanks
07-27-2021, 01:16 AM
#2
Rennlist Member
Just some suggestions: Will the fans turn on if power is fed to them directly from the battery? perhaps with a long jumper wire? You might be able to test the thermoswitch by putting it in a pan of hot water and see if it closes and opens. with an OHM Meter. When you say "Thermoswitch" I presume that you are talking about the one in the bottom of the radiator? Now the right hand fan is connected to the AC system and only turns on when the AC is engaged. I think there may be a minimum pressure requirement by that system to turn the rt side fan on. I thought that the rt side fan was switch activated when the AC was turned on...but it could be pressure activated as well..Good luck with the AC fix!