The AC in my '98 Dodge Stratus is not working right. The outlet
temperature seems to vary while driving. Sometimes when stopped the air
temperature will get warmer, other times it seems okay. I have also
noticed this while driving, but the temperature swing doesn't seem to be
as great. With the engine at a fast idle the low side pressure varies
from 30 to 40 PSI, at curb idle it climbs to 50-55 PSI. High side
pressure at ambient temp indicates the system is fully charged. I'm
thinking the expansion valve is faulty. If you have experience with auto
AC systems I'd like to hear your thoughts.
As far as I know, newer cars donot have expansion valves.
it mightbe a vacuum problem oalso. if the air ducks are control by
vacuum, when you idle or at high rpms you might open or close some
doors that you shoudl do othervsie.
I suggest you feel the low side hose to see if it is cold. If it is
cold, it means yoru system works fine but your air ducks act up.
My car usually blows ait to windshiled under load even it blows
somewhere else at idle.
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