Quote:
Originally Posted by Jeremy5848
An additional monovalve problem that can also cause those same symptoms is a partial failure of the rubber parts inside the valve. This causes coolant to invade the electromagnet area and cause the valve to be sticky. A kit is available to replace this part of the monovalve.
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I've probably installed about a dozen monovalve kits in this car and knew to look for rubber damage - none. I think the complete valve replace has solved my problem. Does everyone realize Bosh has stopped production of these? Better buy a spare while you can.
I also found some monovalve kits are defective and use the following test procedure when installing:
Put the kit into the electromagnet portion and connect the pins direct to the battery to get 12V. A good kit will extend about 15-20 mm and hold that position until the voltage is removed. I found some kits (cheaper, probably from China). That pulse open and closed in my test. Clearly these would not be acceptable. I had two bad ones that I could not returned so I switched out the rubber pieces.