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Old 12-03-2000, 09:04 AM
mihai914 mihai914 is offline
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Join Date: May 2000
Location: Montreal
Posts: 25
Your lack of heat is 95% caused by the monovalve diaphragm being broken, you buy it as a kit and it's very easy to replace but messy. PN for my 420sel 88 is 000 835 06 44. Symptoms on my car were the same as yours.

1988 420sel
1973 porsche 914 2.0 (Deceased)
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