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Old 05-26-2009, 05:01 PM   #1
Rivet Master
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1973 27' Overlander
Loganville , Georgia
Join Date: Nov 2007
Posts: 1,713
air conditioner question.

I have a coleman airconditioner which when I move the knob on the panel it will kick on and blow cold air. The compressor will kick off in about 5 minutes and blow outside air and when I move the knob again it will kick on with cold air. I have two thermostats in my 73 overlander. One is by the Credenza up front and I think it is for the airconditioner. It say cool on it. The other thermostat is by the bathroom and it has heat on it. Are the old coleman air conditioners wired to a thermostat on the wall? When the compressor kicks on it blows very cold air but it won't stay running.

I pulled the cover outside and air blasted the condenser. It has Freon still in it. I am just trying to figure it out.


Brian & Adrienne
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Old 05-26-2009, 07:30 PM   #2
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1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,316
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The way you can test if one of the thermostats is for the AC is to turn both of the to the highest temperature setting. Now turn the AC on. It should only blow room air at this point. Lower one of the thermostats to a temperature below the room or if not calibrated in degrees just slowly lower it and see if it causes the AC compressor to come on. If the AC compressor start let it run until it shuts off the compressor. If the thermostat is in direct line with the air flow that may be you reason for short cycling. If it is move the stat out of the air flow or redirect the air flow.

Generally the newer AC unit have the stat build in the return air flow in the unit itself and no outside thermostat.

If you get not reaction form either stat then I would look for the stat in the AC.

Another reason for short cycling may be a low limit switch on the evaporator that shuts the compressor off if the coil temperature is below freezing. This is a safety to prevent freeze over. If this is the case the unit is low on charge or the coil is dirty to the point it is reducing air flow.

2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

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Old 05-26-2009, 08:13 PM   #3
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1963 28' Ambassador
Smiths Grove , Kentucky
Join Date: May 2008
Posts: 406
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Check the shroud between the air conditioner the trailer and the interior cover. Another member had some issues with his shutting off because the shroud was not set properly and was forcing the cold air back into the unit.

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