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93 300SD,79 300CD work in progress
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48 Posts
Discussion Starter #1
Hello all,new to the forum.I have a 93 300SD I recently had to replace the blower motor regulator on it.Shortly after that I flushed and refilled the cooling system and after that I checked the heater and had no heat.I belong to another forum and the most common answer I got there was the monovalve.I have searched here and found a little information on it but still have questions.I know it has 12v to both of the plugs but haven't pulled the pump to check it.The information that I have gotten tells me it has an auxillary pump and heater,it looks like you can remove them to check for corrosion or other faults.Does anyone know of a way to bypass it and get heat or that wishful thinking?Also sre there any repair kits available?Thanks
 

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Registered
93 300SD,79 300CD work in progress
Joined
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48 Posts
Discussion Starter #2
No suggestions/ideas? Anyone recommend a good source for new or used parts?
 

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Registered
93 300SD,79 300CD work in progress
Joined
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48 Posts
Discussion Starter #4
I tried a search using the word monovalve and didn't really find anything to help.
 
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