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Old 03-30-2012, 04:01 PM   #1
Join Date: Apr 2010
Posts: 63
Trouble switching from ac/vent/heater

I have a 2005 Mountain Aire 4304, Spartan chassis.

On the dash controls for the ac/heater/vent, etc, when I go from one to another I have to open up the front hood and tap on the control motor to get it to switch to work.

There seems to be a electric motor that switches the functions.

Has anyone else had a problem like this? Is there a way to fix it or do I need a complete new one?

2005 Mountain Aire 4304
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Old 03-30-2012, 07:49 PM   #2
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Here is some information on the Evans system you have I would check ground wire locations and the vacume lines for controls.
Evans website info.

98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans
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Old 03-31-2012, 05:21 AM   #3
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Spartan Chassis
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Location: Grapevine, TX
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I had a similar problem. I couldn't swith over to A/C. I had the Electronic Coolant Valve replaced and it is working fine now. You can get the part number (depending on your year and A/C control type) from the Evans Tempcon site that "007" posted and then search for it on the internet. I bought it online from a dealer. I think it was around $180.
2005 Kountry Star 3907, ISC330, Spartan chassis, M&G braking, Blue Ox Aventa XL
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Old 04-01-2012, 07:24 PM   #4
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Had trouble with mine, changed vacuum pump and problem solved.
2006 Monaco Camelot 40 PAQ 400ISL - Toad Jeep Grand Cherokee - DW is the Nagivator. Retired to travel and everything revolves around the price of diesel.
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Old 04-03-2012, 09:41 AM   #5
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My problem seems to be more electrical. There is two wires going into the box. When you select going from heater to AC for example you can hear a small motor within the box come on to switch the function. I have to now tap on the box to get it to switch.
I am going to un-plug the two wires and check the terminals for corrosion. If that don't work I would guess the small electric motor is going bad. Probably need a complete new box.
2005 Mountain Aire 4304
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Old 04-03-2012, 10:07 AM   #6
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Thanks so much for posting the link to the Evans site. I've been trying to figure out the heater/ac controls on our unit since we bought it last June.


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2006 BT Cruiser 5272
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