Air Conditioning gremlins!!

[DavidG986]

I have removed the fan hooked it up to a 9V battery source and the fan started working flawlessly.

[Meir]

Originally Posted by DavidG986

I have removed the fan hooked it up to a 9V battery source and the fan started working flawlessly.

in that case, it might be the fan resistor.
this is the red cube attached to the AC box, and controls the fan speed.

[DavidG986]

Ok heres an update on my troubleshooting. I checked high and low side pressure again today and the low side is normal 30psi average and the high side shows no pressure. this is with the car running and A/C on and compressor engaging. any idea why high side pressure is at 0 psi ??

[Meir]

Originally Posted by DavidG986

Ok heres an update on my troubleshooting. I checked high and low side pressure again today and the low side is normal 30psi average and the high side shows no pressure. this is with the car running and A/C on and compressor engaging. any idea why high side pressure is at 0 psi ??

Hi David.
I sent you a PM.

[rexcramer]

It sounds like your compressor may be done. No hi side pressure, with the clutch engaged, is bad. Is it making a lot of noise? If you have 30 on the low side, you should also see 30 on the hi side. It is a closed loop.

[DavidG986]

Originally Posted by rexcramer

It sounds like your compressor may be done. No hi side pressure, with the clutch engaged, is bad. Is it making a lot of noise? If you have 30 on the low side, you should also see 30 on the hi side. It is a closed loop.

no abnormal noise that I can hear. if the blower fan is plugged in the A/c won't turn on but if I unplugged the blower fan and turn the A/c on, snowflake shows on the LCD screen and the compressor engages. I tested the high and low ports and the PSI values are normal.

Tomorrow I will remove the blower resistor and see what I can find.

[rexcramer]

It sounds like your compressor is okay and that is very good news.

I have zero experience with the blower motor circuit on this car. If you can isolate the blower motor, try to run it with 12 volts directly. Proceed with caution. I understand access to the HVAC system is tight and involved.

I wonder if the dash control unit is acting up. Check with Woody (itsnotanova) for possible used parts.

[DavidG986]

Ok that 0 psi reading was a fluke. apparently something was obstructing the gauge from properly reading the pressure. sure enough I removed everything reinstalled it and the pressure gauge showed a value of 25-35 psi for the low side & 200 psi on the high side.

Im suspecting the Blower Motor resistor, but wouldn't a bad resistor just allow the fan to blow high on every setting?? How do I test it?