Odd 1987 300SDL mono valve behavior

#12

12-16-2017, 10:44 PM

Diseasel300 Diseasel300 is offline

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Join Date: May 2016

Posts: 6,071

Unplug the monovalve and go for a drive. If you have full heat all the time, it's a control issue. If you have intermittent or random heat, the monovalve cartridge is bad. The SDL will heat fine with the Aux pump dead, so a failed one will not cause a lack of heat.

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