Thu Jan 21, 2016 11:58 pm by cornbinder89
Espar, and close cousin to Webasto (or weird-bastard, as a friend used to call them). I use a small coolant type heater, I plumb it so the output passes thru the trucks heater core before going back to the block. (I get 1st dibs on the heat!).
I could never see the point of having two, one for the block and one for the cab (air heater). Even at zero (F) the heater will drive me out of the small cabover, so have to turn the blower off. Then the heater cycle to low output, cause the block is hot enough. Cycles to low when the return temp is about 140 and shuts down when the temp reaches 165, turns back on around 155. The way I run it and in the temps I am seeing it never shuts off all night.
The only problem I have found doing it this way, every season and a half, the combustion blower motor wears out and you have to change it to the tune of $200! I guess its not designed for the long runs I give it.