There are several potential causes for the ac not keeping the air cool in your rv.
Rv ac system not cooling.
Unless you have two ac units.
The two most common complaints are not cooling and leaks.
The ac unit could be old.
Pulling the handle stops the air conditioner from using the ducts and just blows the air out like a non duct system.
There can be issues with the thermostat or the capacitor in the air conditioner.
Rv ac blows cold then warm what causes this to happen is not that difficult to diagnosis.
Rv air conditioner non ducted.
It could simply be too hot outside for your ac to keep up.
Once the temperature was 76 degrees the compressor on the ac would stop running.
When it comes to the sealed system all brands coleman duo therm carrier and intertherm work by using the basic principals of refrigeration.
There are two main systems to an rv s roof air conditioning unit the sealed unit which is the refrigeration part and the air handling system.
So how do you identify and repair these issues.
With the thermostat the colder warmer knob turned all the way cold the air conditioner would cool the inside of the rv to about 76 degrees.
It s not unusual for rv ac units to not cool as well after a few years of use.
The fan would still run but it was no longer cooling the air.
As already stated the non ducted system simply blows air into your rv from its central roof top location.