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Old 05-09-2015, 05:19 PM   #1
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Join Date: Nov 2010
Posts: 21
AC and Heater control valve

Hello, I just replaced the heater control valve on my 2003 R Vision Stratus which is on a Workhorse P32 chassis, 8.1 gas engine. The valve i'm speaking of is the valve just outside of the HVAC distribution box on the passenger side of vehicle. In my case this valve is opened and closed by a electrical actuator that opens the water valve in direct responce to turning the temperature adjustment knob on the A/C heat control on the dash.
The problem with the valve became noticeable when the ac dash air temperature was not getting as cold as it should. I had the AC system checked out and pressures and temps were good according to the technician who said that it was probably a blend door problem. I took it home and played with the system and found out that the discharge hose from the heater core was hot with the water control valve in the off position. I removed the valve which is a straight thru globe type valve with no bypass. Looking in the discharge end I could see that an "O" ring was in pieces. The valve had no mfg name or part numbers on it. I spent a lot of time on the computer and phone trying to find a replacement for the valve. I'm pretty sure the complete assembly (motor and valve)was furnished by Evans. I talked to them and was told they did not sell just the valve and that I would need to buy a complete new assembly for $175.00 Well after much looking at different cable operated valves I finally found an exact replacement at AutoZone part number 74627 cost $19.00
It mounted to existing mount perfectly and mated up with the operating arm of the actuator perfectly.
If your AC is not cooling as well as you think it should it could be the same problem. I hope this helps someone.

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Old 05-09-2015, 05:25 PM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
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laws224, good info , any chance you could post a picture, of the old valve.

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 05-10-2015, 09:08 AM   #3
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Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,632
A very common problem with the Evans Tempcon system,. It was widely installed by RV builders for a dozen years, so we hear about these valve failures often. Experienced it myself on a 2002 coach - it failed after just 3 years of use.
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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heat, heater

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