Electric Aux Fan and Temp sensor/switch questions
#21
#22
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Thanks to everyone who posted on this very old thread. I've encountered the problem on my 1996 AJ16 and thought something was wrong (overheating due to needle between N and H), but this old thread has put my mind at ease. I thought my aux fan switch was defective, but is actually working as designed.
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muzz (09-06-2017)
#24
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muzz (09-08-2017)
#25
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Greg threw a rock or 2 on the roof and got me out from under one of the Jags.
What Jag are you wanting to alter, your profile states an XJ40, and they are quite different from the XJS as far as wiring and modules etc are concerned.
#26
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#27
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muzz (09-08-2017)
#28
#29
#30
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DO NOT DO THIS, the AC compressor is switched by the AC ECM and you will damage the ECM if you do this.
Use the wire that switches the AC compressor on to also switch a relay on, this wire will go to pin 85 and pin 86 to ground.
Then wire to the + terminal on the firewall with a fuse (mine uses a 30amp as the 20amp would blow when the fan switched) to pin 87.
Then pin 30 goes to the fan.
NOTE: A 40amp horn relay will do the job. Be aware some relays have a protection diode on pin 85 or pin 86 if you get one of these post the specs as these are polarity sensitive for the switching coil.
#31
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