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Old 11-12-2019, 03:41 PM   #1
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Heater Problem

2005 Monaco Lapalma 8.1 litre gas. My coolant temp gage shows midway, the heater blows cold until the revs are above 2100 rpm. Any ideas, heater hose on off valve works fine.
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Old 11-12-2019, 05:58 PM   #2
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I've owned two W22 chassis RV's (05 & 08) that, in cold weather, blew only "luke warm" air from the dash vents with the heat on full HOT. It is slightly warmer when driving with the engine working. They've both used the Evans-Tempcon HVAC system, Measuring the warm air temperature coming out of the dash shows it's not even close to the heat from a typical car or truck. Checking the coolant on/off valve on the input side of the heat core showed it was working correctly. I even bypassed it with a hose around the valve but made no difference. My engine temperature on the scan gauge is 190 degrees like any car or truck. So the engine has lots of heat available..

Years ago we, as many others, put up a spring loaded shower curtain pole near the ceiling behind the front seats with floor to ceiling drapes which helped keep us warm while driving when it's cold.
One suggestion I just read from another owner was to disconnect the heater core hoses and reverse flush the heat core and capture what comes out. He claimed all sorts of "crud" came out and there was more heat after. I'll try this next spring.
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Old 11-12-2019, 07:41 PM   #3
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I would start feeling heater hoses. If you have a hot hose coming from the engine to the valve and Luke warm on the out-side of the valve, it's the valve or control voltage to the valve. If it is hot on the in-side of the heater core and Luke warm one the out-side of the heater core it's a plugged heater core. If it's hot coming out of the heater core it's could be a duct disconnect under the dash.

You need to do some simple troubleshooting.
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Old 11-13-2019, 05:55 AM   #4
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Might also want to check that no critters built a nest in the heater box.
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Old 11-15-2019, 09:23 PM   #5
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Maybe put in a hotter thermostat?
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Old 11-16-2019, 06:48 AM   #6
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Quote:
Originally Posted by Keithdee View Post
2005 Monaco Lapalma 8.1 litre gas. My coolant temp gage shows midway, the heater blows cold until the revs are above 2100 rpm. Any ideas, heater hose on off valve works fine.
Mine dash gauge shows midway as well (OBDII info is 190-206), do you know if the dash heater A/C box fresh air door is closing?
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Old 11-16-2019, 09:57 AM   #7
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I may be thinking in reverse so not sure if this could cause this problem. Could it be the damper is not operating correctly because the vacuum line going to it has deteriorated?

There is a small blue vacuum line on the Workhorse that breaks down and disintegrates as time goes by. The one on my Workhorse did this and the damper would not work. Unfortunately, I can't remember if that caused a loss of heat or too much heat.
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Old 11-16-2019, 02:44 PM   #8
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I have a 2004 P32 my evans valve leaks during ac operation so I flushed the heater core and and installed ball valves to shut off all water when using ac and it works great. Also when using full heat it will put out some serious heat when it is cold out side. No need for a curtain.
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Old 11-16-2019, 05:46 PM   #9
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You will find EVAN's info in this link.
Could be the control valve is install backwards.
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