Good point about sensors. I went out and experimented on my Mystique. I measured with the relays pulled, key/engine OFF
Green Low Speed:
3-5 12 Volts
5 to battery ground .4-.5 Ohms
Jump 3 to 5 Fan Runs Slower
Black High speed circuit:
3-5 12 Volts
5 to battery ground .1 Ohm
Jump 3 to 5 Fan Runs Faster
If your 12 volts is missing from 3 to 5 on the green relay, check the ohms from 5 to battery ground, should be more than the ohms from the same pins on the black relay. Good luck, maybe the problem can be solved! The resistor is mounted to the fan assembly. Your fan should then come on with the a/c.
