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Registered
Join Date: Jan 2006
Location: Orange County, CA
Posts: 79
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Wow, sounds just like the problem I was having on my 944. It's apparently a common problem with those, but I'm not sure if it applies to the 911's as well.
FWIW, if it's at all like the 944, the typical suspect is a little plastic connector that breaks and lets go of the control arm that shuts the heat flapper off. Without any control, the flapper valve opens dumping heat when not asked for. On the 944, the control arm and connector is under the dash, just inside of where the driver's knee would be, under a small black plastic cover.
Might be worth to take a quick look.
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Proud Owner:
1996 C2 Cabriolet (993)
1988 944 SOHC
1998 Ford Ranger XLT (Total P.O.S.)
2005 Specialized Allez Comp 27-speed (yes, it's a bicycle!)
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http://members.cox.net/kronowit/porschepage.html
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