99 A/C working pressure?
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99 A/C working pressure?
Hi guys,
My 99 Expedition A/C (front and rear system) is starting to blow a little warm. I'm thinking its a little low on R-134. I have a full set of tools (gages,vac pump,etc) but I can not recall the working pressure on vehicle. Does any one know off hand what the high and low pressure range should be? I will let it cool off outside before working so lets say 92-94deg outside temp. with 75% humidity.
Also is it better to do a full evacuation and fill, or try to top off the system.
Thanks for the help.
Selkirk
My 99 Expedition A/C (front and rear system) is starting to blow a little warm. I'm thinking its a little low on R-134. I have a full set of tools (gages,vac pump,etc) but I can not recall the working pressure on vehicle. Does any one know off hand what the high and low pressure range should be? I will let it cool off outside before working so lets say 92-94deg outside temp. with 75% humidity.
Also is it better to do a full evacuation and fill, or try to top off the system.
Thanks for the help.
Selkirk
Fleet Owner
Joined: Apr 2008
Posts: 24,324
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About 35 PSI on the low side and 200 PSI high side at idle.
If the pressure is low, I would try adding a can first instead of wasting all that is in there. A complete evacuation and refill for a system with rear air is about 4-1/2 cans.
If the pressure is low, I would try adding a can first instead of wasting all that is in there. A complete evacuation and refill for a system with rear air is about 4-1/2 cans.
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