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Idle issue with heat on

1207 Views 2 Replies 2 Participants Last post by  Stang Lane
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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