Engine Size: 350
Refrigerant Type: R134A
Ambient Temp: 80
Pressure Low: 35
Pressure High: Unknown
Country of Origin: United States
Hello all: I'm having some very frustrating problems fixing my A/C. The system is properly charged, orifice tube replaced, and blend door motor replaced (I verified it's operation prior to putting it back together). The problem is the front a/c blows 20 or so degrees warmer than the rear. The rear blows in the upper 40's, and the front in the upper 60's. If I overcharge the system, I can get the front down to 58 or so, but then the rear blows warm. There is no cabin filter, as I have checked that already. I'm at wits end here. Anyone have any ideas?
Thank you in advance. Bob.
Try clamping off the heater core
Got "recirc" selected on the front? the rear is always on recirc- so to be fair.......
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
1. how do you know "the system is properly charged"?
2. replaced blend-door-motor, have you verified correct position (forget whether it works) mine moved, but were not in the right position
3. what do you mean "if I overcharge the system..." how do you measure what you add/remove? weight?
4. have you tried "under-charging". if the evap is flooding "too much" you may not be getting enough cooling.
5. why is your High-Pressure "unknown"
and *most importantly* did you replace the orifice with the correct size???
front evap uses orifice tube, rear evap uses TXV... i am guessing if the incorrect orifice is used, the front evap will not operate correctly.
Edited: Thu May 15, 2014 at 5:07 PM by sdflyer
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