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Coleman rooftop air conditioner just stopped blowing cold

It was fine yesterday but today is only blowing hot air. thank you for your time.

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Make sure you don't have low voltage. washout out side coil and check that fan motor is running. Bad stat,compressor a gas leak or burn wire could be the cause.

Posted on Jun 30, 2009

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1 Answer

2 year old Coleman Mach III tapping and not blowing cold air:


Make sure the condensor fan is blowing through the condensor on the roof. It sounds like the compressor is fighting high head pressures after running a bit.. After so many attepts, or if it suceeds in operating the load trips the circuit breaker.. Make sure the condensor is clean and air is passes through it from the fan. Just for clarifiication the condensor is the coil that gets hot and the evaporator is the coil yat create the cold air. Good Luck, and if you will, let me know how it turns out. Good Luck. Ned

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Jul 10, 2009 | Dometic Rooftop RV Air Conditioner

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The only thing that is going to but the fan off is the thermostat. When the fan stops, immediately check the thermostat on the wall. See is there is power between the B terminal and the GH terminal. If none, then replace the thermostat. If there is, then replace the control board in the AC. That means that the fan relay on the printed circuit board is weak.

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1 Answer

Coleman...not blowing cold air


if the compressor is not turning on then your capicitor is bad they are on the top side of the a/c you will see a set of wires comeing out and there will be 2 5/16hex screws holding acess cover in

Jun 05, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Coleman tsr rooftop airconditioner


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Try having a professional check that the collant lines have not perished. Also have them check the thermostat and that there is actually gas in the system. The warm air suggests that the unit has no gas.

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