AC Problem Mk4 Jetta
I am a brand-newbie to the TDIclub forum, and have appreciated the tips and the help in this thread about A/C issues.
I have a 2003 Mk4 Jetta and the A/C is not working this spring (It has worked flawlessly up until this season).
It is a manual control climate system, and the AC button illuminates and the cabin fan works - it is blowing warm air, however. It sounds like the engine RPM dips when the AC button is engaged, but I could not hear the compressor engage.
Thinking it just needed a shot of refrigerant, I tried that first. I quickly found that the pressure in the AC system was very high - due to the fact that the compressor was NOT running.
I tried the radiator and condenser fan test from the beginning of this thread. I found that ONLY the large fan on the driver's side worked in slow speed with the key ON and the AC button ON. The Passenger side fan did not run. It does seem to spin freely by hand.
I checked the fuses over the battery, and everything looks good - fuses are good, and no sign of melting or corroded terminals or contacts.
I am at a loss for what to try next. I am looking to tap the community expertise here - Would the FCM be the most likely culprit? Would it be the fan itself? I can't see where replacing the fan would make the AC suddenly engage and start to work (?).
I have not tested the wire leads at the passenger fan to see if it is getting power. That is my next planned step. If it IS getting power, then I have to assume that the passenger side fan motor burned up - but why would that keep the AC from running if the large drivers side fan works?
Grateful for any thoughts or advice you can bestow upon this frustrated newbie. Thanks !!