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hello . I can assist you with this .
what is your vehicle ? Make , year , model
okay . when the air goes to only ambient have you looked to see if the A/C compressor clutch is still engaged ( locked )
does the engine temperature get warm also when the A/C issue happens ?
one thing to check first off is at the front of the air conditioning compressor is the clutch shoe air gap
do that and let me know . it should not be too wide , my preference for any A/C compressor is 0.010 in.
no problem ! :-)
you are welcome .