Had a difficult time finding any information by searching. Does anyone happen to know how the circuit for the electric radiator fan in the 86 XT Turbo works? There is a 2 pin connector and 2 pin radiator fan switch, which was replaced but still doesn't work. Trying to figure out how to test the circuit, since the switch is 2 prongs, instead of a single prong grounding switch ea81's have. I know it's more complicated because there is A/C which also is supposed to turn on the cooling fan, correct?
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1986 XT Turbo 4WD electric radiator fan switch
Posted 24 February 2018 - 07:59 PM
I know it's more complicated because there is A/C which also is supposed to turn on the cooling fan, correct?
Has to be a relay somewhere that could be the source of the problem. Thinking from memory there should be 2 relays on the passenger side, close to the strut. From memory, one is for the fan.
Posted 24 February 2018 - 09:46 PM
12v positive to ones side of the fan.
Switch connects to ground.
A/C relay shouldn't have anything to do with it. It grounds the Fan wire parallel to the switch. So the Thermos switch or the A/C relay can ground the fan to turn it on.
You need to test for 12+ on one of the fan wires.
Test for Ground at one of the 2 wires for switch.
Then test if switch is closing when hot.
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