A/C questions, anybody has some Infos?

[thom4782]

The fact that you get different temperatures at different vents is strange. I assume that you checked that the vents are fully open and have similar volumes of air coming out of them. Given the geometry of the air handling system, the temperatures at the outlets should be very close to on another.

The AC outlet temperature at the vents should be something like 40 to 60 degrees when the system works properly. If its not in that range, then there could be several problems. One, the R134a refrigerant is too low and the system needs recharging. Two, the AC compressor has given up the ghost. Three, the mixing flaps in the heater box are allowing too much hot air to be mixed with the cold air.

My guess is that you are low on refrigerant. I suggest recharging the system before you open up the hood, remove the heater core and attempt to fix the mixing flaps. If it was a mixing problem, I'd expect the temperature to be warm and the same at all the vents.

[Topless]

Originally Posted by thom4782

The fact that you get different temperatures at different vents is strange.

Not unusual at all on a 986/996. When the mix flaps fail, sometimes chunks of foam will clog part of the vent system causing this exact symptom. It doesn't always happen this way but it does happen often. Visual evidence of foam bits flying out or found lodged in the vents is good confirmation of failed mix flaps.

[thom4782]

Good point Topless. If that is the case here, then there are really two things to fix - 1) R&D the flaps and 2) remove any pieces of foam that may be clogging the vent lines.