Thread: monovalve
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Old 09-15-2004, 11:13 AM
autozen autozen is offline
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Join Date: Jun 2001
Location: Northern Calif. (Fairfield Area)
Posts: 2,225
As has already been stated, the default position of MB heater systems has always been full heat. If you lose vacuum, voltage, or signal the systems are designed to go to full heat to keep passengers from freezing to death in extreme cold conditions. You should have 12 volts there to keep the heater off. I concur with prior recommendations to remove the connector and the 4 screws and pull the slug out to check the diaphragm. If you don't find a problem there, remove the plastic cover from the pin connectors and squeeze down on the springy parts of the connectors with a pair of needle nose pliers. I have found on several occasions that these springy things lose tension and cotact. The result is heat always, intermittent heat, or piss poor A/C because the heat is on.

Auto Zentral Ltd.
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