Engine Size: 4.7
Refrigerant Type: R134A
Ambient Temp: 90
Pressure Low: 35
Pressure High: 175
Country of Origin: United States
I am having problems with under cooling and need some advice. I bought the vehicle used and all of the A/C system is original equipment. After discharging a small amount of the charge to get a visual it was very bright green in color. Would this be indicative that a previous owner may have added stop leak to the system and could such a product cause expansion valve failure? After recovering, evac, and recharge to the manufacture specs of 32oz the center vent temp is about 60 and the rear air about 55. These pressures and temps were taken at about 1500rpm. So basically no change in performance.
If it doesn't fit force it. If it breaks it needed to be replaced anyway!
Bright green would be dye. Was it undercharged? Did you get the weight/amount of what was recovered? Unknown history, may have a leak that previous owner was topping off. May have excessive oil and sealer would be possible. Did it hold vacuum for an extended time? May need to look for dye trace and find the leak? Check for dye trace in the condensate drain. You may be able to get someone local to use an identifier to prove or disprove sealer suspicion.
You may have a bit too much oil, or a compressor that is a bit tired - but you are within factory specifications for 90f ambient with that vehicle:
High side 170 to 220 psi
Low side 25 to 35 psi
Vent temp 54 to 60f
Your system is at the high end of the range, so if it is not a leaker all you can do is a flush & refill with the proper oil charge. The high side pressure is a bit low, but that tracks with a 9 year old compressor. I would keep an eye on the charge level, and look at things with a UV light occasionally - and keep running it.
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.
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