Brainybear72 answered 9 years ago
Since the two systems AC and trans are isolated and unrelated the only common between is the serpentine belt. When the AC clutch kicks in it is causing more a demand on the engine's torque, than normal. So the engine is being taxed hard. This is a complex problem and I am telling you now I do not have the answer, but I have a few suggestions which may be a solution. 1) the AC compressor could be working harder because it is low on r134a refrigerant. 2) your trans fluid is low. Check it with the engine hot, and if it needs more fluid add Lucas Transfix. If it does not, do NOT or fill it. That will cause leaks 3) check the tension on your serpentine belt. There should be an indicator on the tensioner to say if it is within working limits. BUT if you see the belt shaking and not moving smoothly then the belt does need to be replaced.
what could be causing that and no we were not told about it when we bought it from a private owner
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