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Old 10-30-2006, 10:25 AM
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Join Date: Jun 2005
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300 SEL heater

1988 300 SEL. Had no heat. Replaced mono-valve and auxillary pump.

The old auxillary pump was frozen and wouldn't turn when current applied.
Monovalve had torn rubber fitting. I replaced both.

Now neither monovalve nor pump see ground at the proper pin. Does that localized the problem to the push button unit????

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Old 10-30-2006, 11:55 AM
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smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
Might be the cabin temp sensor but more likely the PBU.

Sixto
93 300SD

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