Quote:
|
Originally Posted by 400E
I can't speak to the effect of JimF's mod on low-speed fan operation, but as designed, low-speed aux fans come on due to increase in refrigerant pressure and have NO trigger related to engine temperature. Remember from your research that the main function of the aux fans is to protect the compressor.
I would suspect that your being low on refrigerant could be the culprit.
|
Correct . The fan speeds are two completely different circuits/funtions.
Low fan is a/c high side pressure activated to keep freon head pressure in check at the condensor and high fan is engine temp sensed by the coolant CTS at 105......the only part shared for both circuits is the fan motor/s themselves. The low fan circuit is accomplished by simply putting a voltage droppin resistor is series with the fan 12v feed from the low fan relay.