Re: cabin heater, how does it work?
Posted: Sat Nov 18, 2017 3:34 am
You got it... the HVAC heater has its own coolant loop but I think it can "mix" with the motor & battery loops if the computer allows? I guess that can slightly pre-heat it if the heater's not been used but you've been driving a while. Otherwise, there's a PTC coolant heater that draws about 6+kW that needs to heat the coolant.Carbuff wrote:Its starting to get cold around these parts. Im starting to use the heater a bit more. How does the heater work? I find that it blows cold for like 2 minutes before getting warm. I guess its not an open electrical element with air blowing past it (like a blow drier) because that would give me almost instant heat. Is it a closed liquid system where the liquid is heated by an electric element? I could see this requiring some time to heat the liquid before feeling hot air. Also, I can drive the car all day without turning on the heat and when I do turn it on it still takes time to get warm. unlike an ice vehicle that makes heat even if you dont have it turned on. How does this system work?
From what I've seen (using FORScan Lite over a bluetooth OBD-II dongle) when used in normal heat mode, non-defrost, the heater coolant loop targets ~130F temp, but when you kick on the defrost mode, the target temp rises to ~150F. So if you ever have the heater on, then kick on the defrost mode and watch the climate power consumption shoot way up again, that's why.
As an aside, in the MyView mode on the left instrument cluster display, there is a display mode where you can see the real-time power consumption of the climate control and "Other" (12V DC-DC converter and maybe other components).