Question about Dometic Rooftop RV Air Conditioner

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Recreational Vehicle A/C

The thermostat keeps going on and off every 30 45 seconds. What could be the cause and is it possible easy fix?

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Check the condenser and evaporator to make sure these are clean. If the filter is not replaced or cleaned regularly the evaporator will become plugged.
If this is a roof top unit the thermostat may have a thermocouple on it that is shoved into the evaporator. Some times these go bad.

Posted on Aug 07, 2008

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Air conditioners running into a small space tend to cycle rapidly. Try to direct the airflow away from the intake so that no cold air reenters the unit. This will allow more cooling before the thermostat cycles.

Posted on Jul 15, 2007

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HEATER NOT HEATING


If your heater is not blowing warm air, your thermostat is probably sticking or your coolant level is critically low. When you start your vehicle, your radiator coolant begins warming up from being cycled through your engine block. One the cooland reaches a certain temperature (usually 130-150 degrees F.), your thermostat spring will retract and allow coolant to then pass into your heater core. However, if your coolant level gets too low, or if you are using a coolant mixture that has more water than antifreeze, thermostats have a tendency to rust and corrode and will stick. Thermostats can also go bad for what seems like no reason at all. The good thing is that usually thermostats are pretty easy to replace. It's the most common thing that would cause the problem that you're explaining. However, if changing the thermostat doesn't fix the issue, there is always the possibility that you could have a collapsed hose somewhere under your hood. If you change your thermostat and none of your hoses are in bad shape, you most likely will have a vacuum line to reconnect under the dash, as most heater controls in late model vehicles are vacuum operated. I'm almost positive that the thermostat will be your culprit though. **Make sure when installing the new thermostat that you use a new gasket or O-ring, whichever applies. Afterwards, start the vehicle and watch to see if you have any leaks around the thermostat housing and continue to observe until the temperature of the vehicle gets to normal operation temperature.

I hope this helps, and hopefully you'll have heat pumping through your vents in no time at all!
Have a great day and try to keep warm!

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