Quote:
Originally Posted by 97 SL320
A quick way to check for water flow is to feel both heater hoses while the engine is hot and running. If the inlet and outlet are hot you have water flow. ( some systems use one in and two out so be sure to check all hoses. )
Do you have access to AC pressure gauges? If while the AC is on the low side goes to zero and the high side goes very high , the expansion valve is sticking.
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yes I have gauges and the expansion valve is new last year, dryer and it ran fine felt it drop suddenly that's why I thought mono valve but as another member said it has no mono valve but a vacuum valve I will look into it but for now I am working on our front end back hoe, that has to come first.