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Discussion Starter · #1 ·
Hi, I just replaced the alternator in my '01 ZX3 (PITA), and now when I turn on the A/C the engine sound really weird, it's a thumping sound that I can hear from outside the car (and even inside also), then when I accelerate to 1500 rpms or more the sound goes away and comes again when hitting 800 rpm, the sound is only present when the car is at D (Drive) and the A/C is on, if the car is in N (Neutral) or P (Park) even with the A/C on the sound is not present, just with the transmission engaged in D or R, any ideas ? BTW the A/C is working really good. Thanks in advance !
 
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