Dash heat & defrost diesel pusher?
How well does your dash heat and defrost work on your diesel pusher. Each year we make one trip in winter and have the same issue the dash heat puts out very little to no heat and does not keep the wi...
Forum Discussion
dougrainer wrote:Gundog wrote:
The one thing I found which I need to follow up on is the temp of the hose entering the firewall going to the heater one hose is warm to the touch but the other hose is not very warm. This leads me to believe it either has a heater valve that is broken or the heater core maybe plugged. I know some automobiles use a heater valve do these Freightliner units use a heater valve? I plan to remove the 2 hoses and see if I can blow air or water through the core. If the heater unit uses a valve it must be electric operated there is no cable like some of the old autos used.
Getting to the heater unit is a pain I need to remove part of the dash to get access.
The Dash Heater and AC system is NOT Freightliner. It is After Market. Freightliner does NOT supply the Front Dash Heater/AC systems. The OEM does. 15 year old unit may be an Evans-Tempcon system. At the front Evap housing will be a sticker that will state Evans/Tempcon. IF so, You Heater Control valve at the Evaporator/Heater Core may be clogged. Common problem with older Evans Tempcon systems. Or the electronic Heater hose valve is inop. Another common problem. Pro Air purchased Evans and this is the Evans breakdown. If the parts look like in this link you have the Evans system. Doug
https://www.proairllc.com/design-engineering/evans-tempcon-guides/
Thanks for the info the controls that it shows in that link look like mine I book marked that page for further reference.
I removed the 2 heater hoses at the firewall and blew air through I got some debris out of the system with air so I rigged up a fresh water hose and flushed the heater putting water in one side and allowing it to drain out the other port after flushing it for a couple minutes and getting a good water stream out I put it back together. It seems to be putting out hot air now. I did not let it run long enough to get to full operating temp because I did not plan on taking it out for a ride and it takes a very long time to get to operating temp just idling. I am thinking i have it fixed our next trip will tell.
