Engine Size: 6 cyl
Refrigerant Type: R134a
Ambient Temp: 75
Pressure Low: 35
Pressure High: 220
Country of Origin: United States
From time to time it seems like the AC does not work so well. My normal reaction would be to add a little R134a. There are 101,000 miles on the car. Never had any AC repairs or damage. A can of R134a may have been added some time ago. Memories are weak. The vent temp stays at 55-58 idle to cruising. It feels colder than that. And the car seems ok. But it seems that the vent temps should be forty something, at least under 50. All three of my thermometers read the same, so I do not think a bad thermometer is the problem, and the temp is the same on all vents. Also, the system seems reluctant to take any more R134a. I started with a half full can, and after 20 minutes or so, I still had 3/8 of the can left, so I quit. It made no change in pressures, or vent temps. There was plenty of condensation on the suction lines, and dripping from under the car. All in all, I think I should not mess with it, but I cannot understand the vent temps. Thanks for your thoughts.
Looks more like an air flow issue than low on refrigerant.
Compressor Type Sanden SD7H15 7-Cyl.
System Oil Capacity (1) 7.8 ozs.
Refrigerant (R-134a) Capacity 32 ozs.
System Operating Pressures (2)
High Side 160-235 psi (11.2-16.5kg/cm2 )
Low Side 20-35 psi (1.4-2.5 kg/cm2 )
(1) Use SP-20 PAG oil.
(2) Measured at 80ÃÂ°F (27ÃÂ°C).
Air flow where? Through the condenser, or the evap?
Condenser, Check for a weak fan clutch or defective electric fan. Can't remember off the top of my head if this vehicle has both or not.
You can't get it wrong, it has both. Engine driven fan on the passenger side, electric fan on the drivers side. Did you miss the part where I said it was a Jeep? :-) What can you expect from them?
They both seemed to work ok, but I did not do any cleaning.
And you have jogged my memory. Somewhere I read something about how a fan will blow air out the side if it is cavitating. Seems like that was happening. I will heck it out tomorrow.
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