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Old 10-01-2022, 08:23 AM   #1
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2002 Allure Dash Heat problem

After last storage lay up the dash heat on our coach doesn't work. Turning the knob to highest heat setting gets nothing. Dash AC still works, fan works, air direction doors work and I can't find any blown fuses. I am guessing the heat valve is just stuck.

Where do I find the heater hot coolant control valve?

Thanks.
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Old 10-01-2022, 09:54 AM   #2
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My hot coolant valves are located beside hvac box. Evans Tempcon system in my 2007 Allure 470.

Brian
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Old 10-01-2022, 12:33 PM   #3
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Here's a couple of older posts that might help:

https://www.irv2.com/forums/f112/cou...at-138376.html

https://www.irv2.com/forums/f112/ove...ng-376104.html
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Old 10-01-2022, 01:54 PM   #4
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Quote:
Originally Posted by DJ55 View Post
Thanks, I tried searching and couldn't get good results. The search engine here doesn't work well.

So it appears there is some sort of pump back in the engine compartment I need to look for? Is it totally activated by the temperature knob?
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Old 10-01-2022, 06:05 PM   #5
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There is a bus pump mounted on the driver's side frame tube. AS far as I know, it runs continuously and is part of the Hurricane system.
I hardly ever use the dash heat, I use the Hurricane to heat the coach while underway. It burns zero diesel because the coolant is heated by the motor
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Old 10-01-2022, 08:04 PM   #6
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There is a bus pump mounted on the driver's side frame tube. AS far as I know, it runs continuously and is part of the Hurricane system.
I hardly ever use the dash heat, I use the Hurricane to heat the coach while underway. It burns zero diesel because the coolant is heated by the motor
We don't have the Hurricane system. Would there still be a pump in that location?
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Old 10-01-2022, 09:03 PM   #7
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We don't have the Hurricane system. Would there still be a pump in that location?
That I do not know. It would be very visible if one is there
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Old 10-02-2022, 10:04 AM   #8
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You should still have that pump. It's my understanding that it helps circulate engine coolant up to the front, not the separate boiler fluid that would be in a hurricane system.
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Old 10-02-2022, 06:39 PM   #9
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Dave,
The Hurricane system on the '02 coach is an extension of engine coolant. There is no separate coolant for the Hurricane. I think your '03 has a different system, ie its own boiler fluid.
During the winter when running the Hurricane, I can pre heat the big chunk of iron up to 60+ degrees
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Old 10-02-2022, 10:10 PM   #10
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Thanks Don, good to know. This doesn't help the OP (sorry), but our '03 does indeed have a separate boiler fluid system, although it runs through (or perhaps next to) the engine block so my Hurricane (now Oasis) system can also heat the engine and be heated by the engine. Great idea to supplement the dash heat by turning on my Oasis heat exchanger fans.
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Old 10-03-2022, 11:57 AM   #11
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Not exactly the same coaches, but on our 04 Allure, the Over The Road (OTR) heater was fed by two pumps. One up under the dash, that basically pulled, and another in front of the engine, that pushed. The one back by the engine would typically fail, due to heat exposure. Many, myself included, bypassed that pump. (Buzzword is School Bus Pump Bypass, or different combo's of that wording.). For us, we found that instead of taking 2-3 minutes for the OTR heat to be felt. It might take 3-5 minutes with only the one pump upfront, pulling to circulate.

We also had a problem with one of the solenoids (Not what it's called, brain fart!), that controls plenums up under the dash. We had to replace the solenoid (Electric control gizmo!), for the plenum control to open and allow heat and or OTR AC to flow properly. So if one of those is out, that could be a factor.

We were a 40'. Built in July of 2003, so should be relatively similar to your era coach.

Another possibility, is if the OTR Heater had not been exercised from time to time, the coolant could have crystalized/clogged the heat exchanger. So the pump could be pumping, but not able to push the fluid thru the heat exchanger.

Best of luck, and happy hunting sorting it out,
Smitty
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