Aux fan not working - Does this make ac to not work

[white_335i]

Originally Posted by upallnight

Check the 50 amp fuse in the glove box. If that is blown, your aux fan is blown. I'm surprised that the ac compressor is engaging, but the ac is not working. The pulley will be spinning but is the clutch plate engaged? Are you misreading the spinning pulley that the compressor is engaged?

Hi Upallnight, all the fuses check out.. It is the compressor clutch engaging.. Like Overboost had suggested, i had unplugged the wire to the ac pressure switch and the aux fan came on at high speed. Will get a new switch and go from there. Thanks..

[upallnight]

Originally Posted by white_335i

Hi Upallnight, all the fuses check out.. It is the compressor clutch engaging.. Like Overboost had suggested, i had unplugged the wire to the ac pressure switch and the aux fan came on at high speed. Will get a new switch and go from there. Thanks..

Since the compressor is engaging, but there's no cold air from the vents, you will need to find out what the pressures are in the system, the low side pressure and the high side pressure and the ambient temperature when these pressures were read.

[white_335i]

Originally Posted by upallnight

Since the compressor is engaging, but there's no cold air from the vents, you will need to find out what the pressures are in the system, the low side pressure and the high side pressure and the ambient temperature when these pressures were read.

Hi Upallnight, I am waiting for the manifold guages to showup, but in the meantime, picked up a can of freeon that has a guage. Connected it to the low side and the the guage is in the "green" 40lb ish, outside temp was 96.. Same reading with compressor on and off. So, this is telling me that the system is full and has no leaks.

I had also used DIS to force/turn on the ac compressor and I am 100% sure that the clutch is engaging.

Also, another interesting thing is, I feel like the vents are blowing hot air as if the temp on the climate control unit is set to high/heat..But, the temp is set to 60... Does this indicate that the heater control valve is open?

Thoughts?

[upallnight]

Originally Posted by white_335i

Hi Upallnight, I am waiting for the manifold guages to showup, but in the meantime, picked up a can of freeon that has a guage. Connected it to the low side and the the guage is in the "green" 40lb ish, outside temp was 96.. Same reading with compressor on and off. So, this is telling me that the system is full and has no leaks.

I had also used DIS to force/turn on the ac compressor and I am 100% sure that the clutch is engaging.

Also, another interesting thing is, I feel like the vents are blowing hot air as if the temp on the climate control unit is set to high/heat..But, the temp is set to 60... Does this indicate that the heater control valve is open?

Thoughts?

With the compressor off, the reading should be higher. When the compressor is running it is drawing the refrigerant through the expansion valve which will cause the liquid refrigerant to expand into a gas and as it expands into a gas the refrigerant gets cold.

The fact that the pressure is the same whether the compressor is running or not leads me to believe that either the compressor is a variable displacement compressor and it is not working properly or you are not able to tell whether the compressor is engaging or not engaging. A manifold gauge set connected to the low side and high side will be more informative.