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Old 03-21-2007, 11:35 AM
Registered User
Join Date: Aug 2006
Posts: 5
560sl heater problems

89 560sl, heater only works minimally when in the auto position, when the fan is turned to on it blows cold. blows just barely warm in the auto positin. Any ideas. also, the air recirc swithc will not stay on form more than a few seconds.

Last edited by mreddy; 03-21-2007 at 12:11 PM.
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Old 03-21-2007, 12:13 PM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
pull the mono valve element and see if the area below the diaphram is full of coolant.check that you have an unbroken circuit thru the outer windings.that valve needs voltage to stay closed[every time you switch off car valve opens] so the last thing may be the push buttons.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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