Heater on dash turns off every now and then
My in dash heater on my 2016 class c motorhome with a Ford E450 Chassie turns itself off intermittingly for about 30 seconds to 2 minutes . It does it on straight highways, climbing grades, going down...
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IF it's going to defrost it likely has a engine vacuum issue. That's what drives the HVAC mode positions. Many times the reservoir is bad.
