Hino 338 heat not working

tete

New Recruit
Owner/Operator
My 2010 Hino 338 heat is not working. Ac works but no heat. Changed the thermostat but still doesn’t blow hot. What could the problem be?
 

Hino123

Expert Expediter
Researching
I would check the heater hoses going into the heater core and make sure they are getting hot. If the hoses are warm to the touch, then you could have a plugged heater core, a binding mode door or heater control cable binding. On the thermostat there is a “jiggle valve” that floats around on the thermostat. The “jiggle valve” should be in the 12:00 position. It most likely would not cause a no heat issue but… just keep it in the back of your head as something to check. Let us know if you find anything.
 
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