H964

i have been doing a lots of research trying to find answers to my ac system issues and would like you guys to chip in
1- at max cold, the fan is extremely weak either at speed 1 or 4, however, at 4 every now and then it will work fine for few minutes.
= my plan is to remove the ccu, clean all contacts and correct any bad connections
2- the last couple of days, with the setting at full cold, sometimes the compressor doesnt engage, but if i raise the temperature, it does. i noticed that only one of the two ac lines at the compressor are cold, and also noticed a large puddle of water under the car (center of front seats) after each drive (assuming its normal)
= i am thinking i have a leak some where and need to check freon level
3- all servos were tested and are working property
4- the rear blower works when i raise the temperature, in fact, the fan speeds work perfect then
i will appreciate any input
mike

power_up

For compressor doesn't engage, but it will if raise the temperature, is it the evaporator freeze up problem? Ref: https://rennlist.com/forums/993-foru...eezing-up.html

H964

Thanks a lot for the link, i think you hit it on the head! will post update
cheers

H964

well, i tried pushing the evaporator sensor further down and suggested but it didnt make a difference.
anyone has the part # for a new sensor?

mike

power_up

96461894300

ToreB

You are describing a typical faulty fresh air servo scenario. A faulty fresh air servo will restrict the air flow. Are you really sure all servos are OK?
As far as I understand from you post you might have problems with the fan speed only at certain setting, not the others. If so, you might have a problem with the CCU fan control potentiometer. This could be fixed with some good electronics cleaner.
First thing is to check the refrigerant level. If it's too low the compressor will stop.
All details here:
www.porschehvac.bergvill.com
Cheers,
Tore

H964

update:
both servos are working properly, and the temperature drop was caused by a bad evaporator sensor.
took the ccu out and cleaned it well, but it made no difference! however, i just realized that it was always working property as the passenger blower fan responded correctly to all setting! (duh moment)
conclusion: driver's side blower fan is not working! previous owner just replaced it before i bought the car, it looks like it has failed again!
any other way to verify blower fan operation?