2oldman wrote:
No one's mentioned low AC voltage.
Yup I did!
Do I get extra points for that? :B
Also check your coach battery. A/C needs good strong 12 volt for the thermostat to work.
RV Mobile Repair-----best bang for you buck to diagnose the problem.
OP said he's sitting in an RV in a '100 degree' heatwave.I was sitting in 96 degree heat with HIGH humidity in Florida when mine went out for the first time. Mobile Repair came out and first thing he did was look at the coils and cleaned them. All that gooey green Florida mold was all over them and it froze up.
He said I wasn't the lone ranger. High heat temperatures for long periods of time and these RV a/c's can't keep up.
He Took the time to teach me about covering windows, covering all three of the roof vents, covering skylight in shower, covering the windshield etc to try and keep some of the heat out to help the a/c.
AND in his experience he said many Floridian RV'ers add a portable dehumidifier during long heat wave conditions.
I DID all the preventive coverings he suggested AND it took the temp inside the RV down by 20 degrees and the a/c never froze up again.
He also claimed that the need for us to run the fan at high speed during heat waves to 'make it cooler' is what makes the a/c's freeze up in high heat high humidity weather conditions.
I set my fan to low that day and have never turned it back up to high.
That and all my coverings added made for an uneventful first summer in Florida and from that day forward.
Putting RV vent pillows in all your roof vent openings makes a HUGE difference for both summer and winter! IMHO if you don't do anything else, DO put the pillows in the ones with the silver on one side.!:W
