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+--- Thread: 2011 kw t660 heater not working? (/showthread.php?tid=1125)
2011 kw t660 heater not working? - jimeneztrans84 - 11-18-2016
When I bought my truck in January the heater was working and in summer time I shut off the coolant valves that go to heater because I wasn't going to be using my heater. Well a couple days ago I open up the valves to turn on my heater and now it's not blowing hot only cold. Any thoughts?
RE: 2011 kw t660 heater not working? - Nilao - 11-18-2016
Heater core plugged up maybe? Do both lines get hot? Perhaps the blend door is stuck? Just a couple thoughts.
RE: 2011 kw t660 heater not working? - jimeneztrans84 - 11-18-2016
I think the temp knob on the cab is not working because when I turn it to hot on ac it doesn't change temp. I tried my sleeper heater and that works good blowing hot. So I'm thinking the knob on cab doesn't work. I'm going to double check my fuses.
RE: 2011 kw t660 heater not working? - jti2015 - 11-18-2016
There's a water control valve located in the engine compartment near the A/C box. Check out to see if it's operating. The valve is electric operated.
RE: 2011 kw t660 heater not working? - joed2323 - 11-18-2016
(11-18-2016 )jti2015 Wrote: There's a wvater control valve located in the engine compartment near the A/C box. Check out to see if it's operating. The valve is electric operated.
Should be located on the p/s firewall.
You could possibly pinch one of the coolant hoses off going into the heater core/coolant valve, see what that does. Or even tap the electronic coolant valve that was stated previous.
Stupid electronics.
I remember the old days when this was operated by a cable, and it use to cease up, and you had to lube up the mechanism to allow easy travel...