R/ the changeover valves. I had to R/R one (defrost) a while ago.

They are easy to pull and bench test with a 12V power supply, or battery. They can also be had very cheap in the JY, and of course bench tested before install.

Do you sometimes get a rapid click sound coming from the changeover valve area? That is what happened to mine, it usually did it when I first turned on the ACC,

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----Adam

1985 300SD 322,000