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Registered
Join Date: Apr 2001
Location: Mansfield, Texas, USA
Posts: 209
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I know this sounds weird, but check to see if you have a switch on the power steering pump. On the 944 "S", this switch is used to realize if the idle has dropped after the a/c is turned on. If it has dropped, it sends a signal to the F.I. to increse the idle. If the switch is wasted, the heater fuse burns up.
Just my .02
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