NeverHome2 wrote:
It could also be low on refrigerant and cycling on the low pressure switch. The pressure rises with temperature but as soon as the compressor starts it starves for gas and sucks the pressure down, opening the low pressure switch and shutting down the compressor. You will need to put a set of refrigeration gauges on to verify this. The gauges are also needed to put refrigerant into the unit. Caution though, if it is low on gas there must be a leak which must be repaired. Look for areas of oil leakage they will show where the leak is.
RV Roof AC units have no low pressure switches. Doug