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Discussion Starter · #1 ·
96 mustang gt 5speed. Sometimes when sitting at idle with the heat on the rpm's will drop and power supply seems to drop and there's a rattleing that sounds like a rattle you get from clutch chatter. Don't know what it is?
 

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Sounds like your heater could be putting A strain on your alternator. Have it running put the heat on & see if the noise is coming from the heater motor or the alternator. This could be as simple as A belt, but your first step would be to find out where the noise is coming from. If you have under drive pulleys your alternator may not be spinning fast enough @ idle to support the extra current draw from the fan motor. Does your car surge @ idle (RPM's up & down) this could also be the problem. Just A few things to ck good luck.
 

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Discussion Starter · #3 ·
This problem only occurs every once in a while so ill have to wait til it happens again but ill have my alternator tested just to be sure and check some other stuff. And I do not have under drive pulleys
 
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