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Old 10-09-2017, 08:49 PM   #1
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No dash heat! Brrr

I am in Canada without dash heat. I know this has been discussed but mine are new information
The temp Gage shows below normal going down the road. I stopped and checked the two valves by the motor. Both were open. Neither valve was warm. I squeezed one of the radiator hoses and it was pretty warm but not pressurized. How can this be? I had been driving for hours.
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Old 10-09-2017, 09:36 PM   #2
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Engine t'stat stuck open and low temp = low pressure .

Have t'stat replaced and rad cap pressure tested.
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Old 10-09-2017, 09:41 PM   #3
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That mostly agrees however, I think o would be getting some heat. Low, but some
I want to check the vacuum hose I read about somewhere. Perhaps out odds leaking. Thanks, I do believe there is a thermostat problem.
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Old 10-09-2017, 09:50 PM   #4
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Vacuum issues with the dash controls will result in the air flow coming through the defrost vents only . If you can switch air flow through the system ( floor , vent & defrost ) , you don't have a vacuum leak or 12 volt vacuum pump problem.
The flow control valve in your coach's heater should be electronic controlled.
The cooling system needs the pressure to aid coolant circulation through 70 feet of heater hoses.
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Old 10-09-2017, 09:55 PM   #5
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very good info! I would like to just buy a new radiator cap instead of testing it.
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Old 10-09-2017, 09:59 PM   #6
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I need pump pressure to move the water 70 feet though right?
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Old 10-09-2017, 10:20 PM   #7
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Higher RPM may help circulation some , but because the heater core sits higher than the rad and expansion tank , you need pressure too.

Engine t'stat , is a 180 or 190 degree unit , when operating correctly you should barely be able to touch the upper rad hose, or any part of the engine or cooling system.
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Old 10-09-2017, 10:22 PM   #8
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Thanks for the pressure specs. I will look for one tomorrow.
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Old 10-09-2017, 10:23 PM   #9
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oops those were tstat temps. Duh
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Old 10-09-2017, 10:33 PM   #10
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Cap pressure spec. should be stamped on the cap .
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Old 10-09-2017, 10:38 PM   #11
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I have my motorcycle mounted up on the back of the mh. I will have to crank it down to get the engine door open tho get the cap off.
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