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switching heater on can be felt in engine vibration 850 1995

posted by  someone claiming to be homer on  Thu Dec 7 07:32 CST 2000 [RELATED]

As i turned on my heater fan i noticed the engine idle to roughen. Checking it compared to switching it on with the defroster on i noticed the same thing. I know the Ac is supposed to kick in when the defrost is on and a slight roughness when the compressor engaged would not be suprising--but i didnt think it engaged when set for heating the floor? Is this normal or have i discovered a short that might explain all the early death of AC i read about here???





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