QuestionLast year I had A/C compressor replaced. 1 Year later A/C compressor is out again. I have been told by mechanics that have checked A/C recently that the auxilliary fan fuse keeps blowing. Mechanic recently replaced and converted to new A/C compressor. No mention of auxilliary fan fuse. I checked fuse and it is blown again. Could you explain what the auxilliary fan is and its correlation to the A/C compressor if any? Would turning on the A/C cause that fuse to blow when there is a short in the wiring for the auxilliary fan? Additionally, the new A/C compressor is producing cold air, however, not enough air is coming out the vents to cool down the cabin of the car. Could this auxilliary fan fuse problem be related to the low air flow from the vents or would that be specifically the blower motor. My mechanic says to replace the blower motor, however he has done no computer diagnostic and altogether missed the blown fuse for the auxilliary fan. i would appreciate your input and advice. Thank You for your time!
AnswerIt sounds to me like you are getting ripped off. Their is no reason the compressor should blow after a year if it's new or rebuilt. something is wrong in the system. It is likely that when replacing the compressor the first and second time they neglected to replenish the oil that had spilled causing the bearings and reed valve in the compressor to prematurely wear . As for a lack of coldness in the air, that is controlled by a thermostatic expansion valve that sits on the fins that are cooled by the rapid decompression of the refrigerant so, if this valve was bad, the coldness of the fins may not be good enough due to this valve
HOWEVER!
I cant even begin to guess what the real situation is because i don't know what the pressures are, i can't visually look at the ducting or condition of the evaporator and condenser.
it is possible that the auxiliary fan is reducing the cooling ability of the system but only if it gets better when it has more flow (low RPM high speed). The a/c switch turns on the auxiliary fan on low when the system is turned on, so it sounds like a short somewhere, unless the fan is bad (you can test it with a car battery, don't let them throw away the old one if you opt to have it replaced.
As for the cabin blower motor, it's rare to see a fan that is becoming less powerful, they either work or they don't. You may have a problem in the ducting, the resistor sword is bad (unlikely) or you have a voltage drop in a wire. This can be tested by checking the voltage at the fan terminals with the fan on high, should be 12v.
hope this helps
