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11-12-2019, 03:41 PM
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#1
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Junior Member
Join Date: Jun 2019
Posts: 17
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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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11-12-2019, 05:58 PM
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#2
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Senior Member
National RV Owners Club
Join Date: Mar 2012
Location: Lac Du Bonnet, Manitoba
Posts: 685
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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.
__________________
Ellen & Greg
08 National Dolphin DL-35Ci, RoadMaster Rear Sway Bar, Rear Trac Bar, Koni Shocks Front,
Workhorse W22, Kelderman Air Ride, Towing 2016 Smart Car
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11-12-2019, 07:41 PM
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#3
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Senior Member
Workhorse Chassis Owner Rexhall Owners Group
Join Date: Feb 2003
Location: Everywhere,USA
Posts: 1,518
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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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Full-Timers
in a
2003 Rexhall Aerbus 3550BSL
W22 Workhorse
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11-13-2019, 05:55 AM
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#4
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Senior Member
Join Date: Nov 2013
Posts: 5,770
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Might also want to check that no critters built a nest in the heater box.
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2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
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11-15-2019, 09:23 PM
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#5
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Member
Join Date: Aug 2019
Posts: 46
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Maybe put in a hotter thermostat?
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2003 itasca Sunrise ipF32v 8.1L w22
Front back sumo springs
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11-16-2019, 06:48 AM
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#6
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Senior Member
Join Date: Jul 2018
Location: NC
Posts: 234
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Quote:
Originally Posted by Keithdee
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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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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2004 Monaco Lapalma PDT W-22, 8.1
FSE Industrial Ceramic Kilns.
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11-16-2019, 09:57 AM
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#7
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Senior Member
Join Date: Jan 2009
Posts: 5,345
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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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03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
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11-16-2019, 02:44 PM
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#8
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Member
Join Date: Oct 2012
Posts: 86
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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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11-16-2019, 05:46 PM
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#9
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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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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