I ran a search and was unable to come up with anything comparative to my problem...hence the post.

Thru on the A/C yesterday and was surprised to find that only the driver's side far left vent was pushing out cool (not cold) air.

Each subsequent vent to the right of me was pushing out progressively warmer air.....the far right passenger's vent wasn't even warm...it was hot !!!

Not familiar with the A/C systems here.....what's going on ?

Simple recharge ? Leak ?

THANK YOU !!!

 

Very untechnical, but it appears to be an impending recharge... I may be wrong.... think the other guys will chime in soon!

 

I may know something soon, since my AC seems to have quit completely. The revs drop briefly at idle when I hit the switch, but there is no cool air.

 

Keith,

Sounds like a combination of recharge and mixing valves not operating properly. I mention the mixing valves, because you should be getting the same temp air out of all the face vents.

Randall G in California knows the 993 HVAC systems inside and out. You may want to PM him. His knowledge is excellent and he is very helpful.

 

Sounds most definitely like a mixing valve. Take the black plastic shield off that covers your mixing motors right under the front hood near the base of the windshield. You will see a few little black servo motors that control mixing valves, recirc, etc. Turn the key on and have someone cycle the temperature from cold to hot or hot to cold and see if the two servos operate. If only the drivers side operates, you got it. There is a printed circuit board that controls the variable positioning of the arm and it is susceptible to burning out a hot spot so the servo no longer operates. I only say "susceptible" because I have had two do that same thing.

I would think however, that if you fix that first, you might get significantly cooler air from both vents. Even the slightest bit of that hot air coming in makes it just impossible to get things cold. But I don't know for sure if the far left vent next to the ignition switch is on a completely isolated air "circuit" from the right - so I might be completely wrong there.