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Old 10-27-2005, 12:42 PM
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Join Date: Oct 2005
Location: New Jersey
Posts: 4
87 560SL No heat

I took the suggestion of checking the monovalve. It looked like the rubber was in good shape, and I checked that it was getting power (13 Volts +-) . It is. Since it is not expensive to use a repair kit, I ordered one.
But I'm still not sure that this is the problem. Can anyone suggest any other possibility that I should be checking.

Steve Metz

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Old 10-27-2005, 09:35 PM
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Location: Atlanta, GA
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the amps like to go bad.. Do you at least have heat on full defrost?

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Jonathan Hodgman
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Old 10-28-2005, 08:18 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
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IF you un-plug the heater valve(electrical connector) you should get FULL heat. IF not then either the heater valve or heater core is plugged up!
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Old 10-28-2005, 08:22 AM
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Location: NE Alabama
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One other possibility for no water flow thru the heater core... Is the aux. water pump functioning? You can easily check by it. It is located in the same vicinity as the heater valve. While there, check to see it is getting supply voltage to rule out power problems, etc...

Good Luck!

RM Smith
1988 560SL

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