Mr. Carb Posted February 24, 2018 Share Posted February 24, 2018 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? 1 Link to comment Share on other sites More sharing options...
john in KY Posted February 25, 2018 Share Posted February 25, 2018 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. Link to comment Share on other sites More sharing options...
Gloyale Posted February 25, 2018 Share Posted February 25, 2018 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. Link to comment Share on other sites More sharing options...
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