Engine Size: 2.6
I have a 1989 isuzu amigo with a 2.6L motor. When I turn on the AC (AC button is pushed in, output is selected to be 0) there is a drop in engine RPM and a hissing noise from inside the cabin even without the fan turned on (no air ouput in the cabin).
Any ideas what the problem could be?
Does it cool OK with the fan on? If I understand your description, the problem seems to be the fan switch is not disabling the A/C when set to 0 like it should.
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