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Old 07-17-2011, 09:51 AM   #1
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1989 34.5' Airstream 345
Cleveland , Tennessee
Join Date: Jul 2007
Posts: 787
AC keeps tripping breaker - solved

About 3 weeks ago I put a replacement fan motor in a Coleman Mach III. The AC ran great while outside temperatures were 85 & lower. The air coming out of the vents didn't seem as cold as it used to be. I just figured the new motor ran faster & was more efficient. When the temps got hotter, the breaker would trip. I replaced the breaker as it was original to the 1976 SOB. I also replaced the 2 capacitors while changing the motor. 1st breaker trip would be at 15 minutes, After a couple of resets, the time was reduced to 10 minutes, I was checking everything electrical that I could think of.
While up on the roof, I spilled the beverage I was also working on. The liquid ran straight for the tools I had laid out. after picking them out of the liquid, I put my hand near the shroud to let the air dry my hand. Huh, there was no air coming out although I could see the fan spinning. The fan blade was turning in the right direction.
It turns out I had put the fan blade too far into the metal shroud to do any good. It was just blowing the air around inside the shroud & not cooling the AC radiator. I moved the fan blade so it sat in the shroud opening, but 2/3 of the blade was on the outside.
Wow, now i get a lot of hot air blowing out of the shroud. The inside air is just as cold as I remember it. And the breaker hasn't tripped once. If you go to replace a motor, take a picture of measurement to make sure the blade goes where it belongs.

"Sometimes I wonder if the world is being run by smart people who are putting us on, or by imbeciles who really mean it." Mark Twain

AIR 22749 WBCCI 2349 NOVA TAC TN-6
1989 345 LE Classic Motorhome
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