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Radiator Cooling Fan

Radiator Cooling Fan

Tom Golodik

Tom Bennet wrote:

I just realized that the radiator cooling fan on my '87 XJ6 doesn't turn on with the A/C compressor. The fan, relay, etc. check out fine. The wiring schematic shows a connection to the compressor clutch circuit, but it's not clear. Where exactly does the fan circuit get it's power from the compressor clutch circuit?


The fan doesn't turn on with the A/C compresser. A post I got from James Caan in response to my original question about the thermal switch's location mentions that the fan should come on when the engine temp hits 96C. The manual is silent on start up temperature, but does say that it should automatically shut off when the temperature drops to 92C. It also says that the fan will continue to run after the engine is shut off if water temp is higher than 92C.

The fan is controlled by a thermal switch, which on my 86 SIII is located on the extreme edge of the radiator on the passenger's side, between the fan shroud and the fenderwell about two thirds of the way down the radiator. Two wires come out of it (looks like a bronze nut about the size of the oil pan plug). The power for the thermal switch comes from #11 in the main fuse panel (rated at 35 amps), according to my wiring diagram,marked light green and orange. The other wire, light green and white, runs to the prong marked 85 on the relay, found on the opposite side of the radiator, and usually mounted near the top back edge of the cross piece over the radiator. By applying 12v to this wire, I was able to get the relay to click in and to start the fan operating. Next I must check to see if the thermal switch is powered, and, if it is, then the operation of the switch itself.

Many thanks to those who responded to my original query about the cooling fan, including Gregory Andrachuk and James Caan.

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