When the outdoor temperature is moderate (up to about 95) the air conditioners in my 97 Dolphin work as designed: blowing cold air, taking turns running, keeping the coach comfortable. When the outside temp edges above 95, the front AC becomes intermittent. The fan will start for about 10 seconds, then the compressor will try to start up. After a couple of seconds, both the fan and compressor will shut down. A few minutes later, the cycle will repeat: fan, compressor, shutdown. This goes on as long as the system is turned on and the temp remains high. When the outdoor temp drops again, the unit resumes proper operation. While all this is going on, the rear AC continues to perform normally. If the make and model of the AC units and thermostat matter, I can try to get them, but I think this is enough info for someone to make a good guess as to the cause of the problem. Thanks in advance for any help
Wife, beagle, Siamese, Self
1997 National RV Dolphin 535, Ford F53, 460 V8
2007 Toyota Prius on a dolly
My guess is low voltage. When it gets hot A/C draws more current and your shore power (?) doesn't give it out. If in campground, even more likely as everyones A/C is drawing more. Most CG's were wired for only one A/C per RV, if that, IMHO. What is voltage INSIDE RV during times it doesn't work?
2010 Ford Expedition TV
2010 Outback 230RS Toybox, 5390# UVW, 6800# Loaded Not yet camped in Hawaii, 2 Canada Provinces, & 2 Territories I can't be lost because I don't care where this lovely road is going
That is interesting as related to my on board flash freezer. The hotter the outside temperature is the harder the compressor is to turn over. The head pressure increases with work/heat. It will make enough difference that I can not start it after running, without a long period at rest to lower the head pressure....without ripping the belts off the drive! But started in the early cool morning and not shut off, it will run all day without a squeak from the double belts.
In any case I may agree with a power issue. Although the rear air works well. Perhaps there are other electrical loads on the Fr. AC circuit? Not usually though. Compressor not permitted enough time to lower the pressure before turning on again? That could mean there is more gas in the forward ac as compared to the rear which seems to run fine. If just the forward one is used (left on) will it function normally?
As I said, we're in lower temps right now, so I haven't been able to investigate. (We'd rather be where it's cool outside than sit in the heat trying to figure out a crotchety air conditioner.) The system works OK here on the coast of Washington.
Jerry B and Kansanfor life: this isn't the normal cycling between the two AC units. The system does that just fine at moderate temperatures. The problem involves the front AC unit trying to start for a few seconds, then stopping. Ozlander might have found it, or cross country. If we venture into high temps again I'll try to do some more diagnostics.