Robert, so the PTC turns off after the engine has warmed and now circulating coolant through the heater core?
If so, if one set the heat temp at low until the engine was warm, then the PTC would not come on?
And which source does the Rear Heater use a PTC or a heater core, seem like a long way to run coolant.?
Thanx
I've read through all the posts I could find!
Why can't I just turn the climate control system OFF, with the switch, until the engine heat is sufficient to do the job? I assume the PTC Heater wouldn't be needed. I might be chilly a while but it would ease my paranoia!
@Webster, that by "low" you mean the lowest setting, since 60 degrees would kick on the PTC heater on cold days.
Here's what I know, from my learning on the Ascent from the Ascent's New Technology Training Material
Both: The PTC heater activates when the car is first started and the coolant isn't up to temperature,
as well as when idling in extreme cold
when engine temps are too low to handle heating the cabin (it doesn't turn on just when idling).
So, in other words: if your car is maintaining 195 degrees coolant when idling, then, the PTC heater would
most likely only come on when you start the car with the heat on any setting that (a) was warmer than ambient/cabin temperature and/or (b) when recirculation wasn't on, and outside air was lower than the set temperature.
If heater coolant temp is at the Subaru 195 (+/- 1-5 degrees), the PTC heater
most likely will not turn on.
And, as an added bonus, here's the best image ever circulated of the Ascent PTC heater I know of - it's from my training library. I think, things considered, Subaru won't get too mad at me for sharing it.
Have any Ascent owners on this forum had their Ascents spontaneously burst into flames?
I might know the answer to that, but, if they're here, they've chosen not to comment, and I respect that.
Remember though, there are only TWO such people, anywhere.
Thanks for all the great information. I am a paranoid sort, though, so I still have concerns. It seems logical, as others have suggested, that if the car has been parked for several hours without bursting into flames, that it will probably remain cold until it is started again. Is this true? There is something that starts up and makes noise at some point after the car has been shut down -- is that related to this issue?
Thanks again for the knowledge.
Once the car is off, and power isn't going to it, it can't burst into flames, because there's no current arcing between the connections, causing a heat condition. So, if it
WAS arcing while you were using the car, it will begin to cool. It will though, get progressively worse each time. Again though, there's arguably TWO cars out of over 271K (and 9 cars forced to have an issue).