A/c not working properly
#12
X2 to the above comments. This will also drive up high side pressures. We fix probably 5 a month with this issue. Orifice tube/expansion valve usually doesn't give issue unless someone's used sealer in the system at which point its common to see the low side pressures bottom out.
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#13
Could be a vacuum leak and at low rpm the door in the heater box switches the door to heat. As the rpm increase the vacuum pulls the door back the other way. Is 4X4 not engaging or cruise control not working right they all run off vacuum. Had it happen mine when the line to the cruise control cracked.
#14
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