Forum Discussion

Eddy_smith's avatar
Eddy_smith
Explorer
Jun 11, 2019

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 grades, city driving, It just does it.

Took it to Ford six months ago because it was still under their warranty. They claimed they could not duplicate the problem. Not really sure what that was going to do. But since it was going out of warranty they claimed they replaced the entire heater assembly.

Anyways worked fine up until now. Same problem.
Anyone have any ideas?"
Thank you
Class C
  • Kamphiker's avatar
    Kamphiker
    Explorer
    Jun 11, 2019
    is it going to defrost mode ?
    (Air changes from dash vents to blowing on windshield)
  • sch911's avatar
    sch911
    Explorer
    Jun 11, 2019
    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.
  • Eddy_smith's avatar
    Eddy_smith
    Explorer
    Jun 11, 2019
    sch911 wrote:
    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.


    No it does not go to defroster. It just shuts down. Blowing cold air, and after a few seconds or a minute or so the heat comes back on.

    I cant seem to figure it out.
  • dougrainer's avatar
    dougrainer
    Nomad
    Jun 11, 2019
    I would suspect the 12 volt power for the AC/Heater unit is on a auto reset 12 volt circuit breaker and that breaker is either undersized or is weak. Ford usually does NOT install a Auto CB but a 40 amp fuse. Somebody may have changed out the fuse with the Auto reset CB. Doug

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