Model: Grand Caravan 3.3
Engine Size: 3.3
Refrigerant Type: R134a
Ambient Temp: 80
Pressure Low: 30
Pressure High: 200
Country of Origin: United States
92 caravan blowing warm. Ac performance has been going downhill for awhile. Ac in past was working better when i ran the rear ac with front but that also stopped helping. Compressor in van is original. System was retrofitted to 134a about 5 years ago. My mechanic did it and i don't believe he replaced any parts. The only thing he did was put the adapters on schrader valves. Also about 2 summers ago i lost all my freon they determined that it was the low side schrader valve which was leaking so they just replaced that and has been fine since until now. Compressor sounds like it is engaging AC fan goes on but i am not getting cool air out of the vents it is coming out about 80 degrees. I have gauges and checked pressures with ac on full blast the low side is hanging out about 28 or 30 and high side is sticking around 200. Problem is not the controls Any ideas what it could be?
Pressures are a little low for a dual unit system. I would start by inspecting the connections for signs of a leak. These vehicle are know for evap leaks with will require a electronic leak detector to tell for sure.
Today i went out and bought a temp gauge to stick in vent. outside it was 90 degrees when i turned on air after a few minutes according to the gauge i was getting 60 degrees out of the vents it didn't feel that cool but i guess it was. SHould it be cooler after a few minutes i went under the hood i felt the small hose it felt warm the big hose felt a little cooler but there was no condensation forming on anything of the lines isn't there suppose to be. I only ran it maybe 10 minutes was this enough time. Then a few days ago i went to turn on ac and thats all i got was warm air compressor always engages and ac fan goes on what does it sound like? When system was retrofitted about 5 years ago i don't think it was done properly thats all they did was change schrader valves and thats it could the problem be the drier or accumlater or expansion valve?. I don't think there is a leak because last summer i checked the high and low pressures and it was about the same so if there is a leak wouldn't it have dropped?
Edited: Tue June 10, 2008 at 2:58 PM by [email protected]
There is no leak in system. When i turn AC on it operates normally compressor engages AC fan goes on and the small ac hose gets very hot big hose is getting a little cool. I am only getting a maybe 4 or 5 degrees delta t. Today i was looking under hood and felt the hose which goes into the heater core and it felt hot!! is it suppose to be hot? Could this be my problem? I am a little hesitant because i am not getting hot hot air and when i leave it in fresh air mode i am not getting hot air would i be? Last question if i did have a heater control valve stuck open and i had the ac on should the big ac hose be cold and moist? or would that only happen if the heater control valve was closed?
Edited: Fri June 27, 2008 at 6:10 PM by [email protected]
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