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Mr. Carb

1986 XT Turbo 4WD electric radiator fan switch

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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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I know it's more complicated because there is A/C which also is supposed to turn on the cooling fan, correct?

 

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.

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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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