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Old 12-12-2001, 05:30 PM
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sixto sixto is offline
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,114
I have a similar problem on my car. There's heat in city traffic and no heat on the freeway. If there's no heat at any time, it could also be a bad cabin temp sensor.

Aparently the monovalve is easy to repair/replace. It's under the ABS controller on your car. I'll know more when I fix mine hopefully this weekend.

91 300SE
81 300SD
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