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Old 01-16-2007, 07:43 PM
Registered User
Join Date: Oct 2005
Posts: 44
126 Heater core information needed

Hello everyone,
I need a little help again. I'm trying to diagnose my heat problem, I have very little heat. The engine temperature is normal and I can't see any tears in my monovalve diaphram. I would like to bypass it just to be sure that I haven't missed a tear. My problem is that there are 3 hoses going to/from the heater core. 2 from the monovalve and 1 to the block (return) I am wondering if you could explain what the deal is with the 2 "incoming" hoses?

1982 300sd
1980 300cd (sold)
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Old 01-17-2007, 10:44 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
pull off the plug to the monovalve.this should give you full heat[it needs power to keep it closed]if your heat now improves you know that it is either the push buttons or more likely the temperature regulator relay[underglove box screwed to airduct].

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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