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Old 01-12-2000, 08:49 AM
Posts: n/a
A torn diaphragm on the mono-heat valve will do exactly what you describe. If its a European car with dual temperature wheels it has a heater valve with two inserts.The heater valve should be behind the false firewall to the right of the battery(looking from under the hood). It has 4 slot-head screws in the top that hold the insert in the housing. The insert costs around $30 and is easy to replace.
Randy D.
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