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Originally Posted by Gilly
CHECK the monovalve, the rubber diaphragm gets a tear or hole in it and the coolant is resent back to the engine instead of the heater core. MOST time in a case like this, it's a torn diaphragm and a repair kit will fix it. Don't go chasing electrical problems yet, i am really sure it's the mono water valve.
Gilly
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Thanks Gilly.
Looking at the valve, I found the first thing is to remove the diagnostic connector. I saw a detailed post on this forum by Philip Fox. But on my car, one of the screws is completed blocked by the transmission fluid level check sticker. Does my 560 SEL has a different screw to secure the diagnostic connector?