Rear A/C

[Ram Montana High Country]

I think the rear unit might have been/is icing. Usually it low Freon but can be air flow restrictions. Took off the first return grill - minor dirt but insulation all but had the return blocked. Ditto on other side. Put a flash light in on side to hold it up. Used Small spice bottle in other side. Thinking about PVC 1 1/4” or 1 1/2”. One or two pieces? How long?

[Mudchief]

I cut one for each side about 11 inches long.

[DQDick]

All I had was 1 1/4 so I did two, about 10" long on each side. I also cut everyother fin off the supply vents in the cieling to increase the outflow also.

[Ram Montana High Country]

Do the vents just pull off? Seemed to want to stay attached. Just as a temp fix on the road, grabbed some 1" PVC Couplings - measure 1 1/4" OD

[tomNtrisha]

My 3791rd returns were pulling air from top of the wall on each side with minitemp meter very high temps. So I turned them so they would pull air from inside room put pvc pipe in ducts set T stat on 77 have 100 plus temps days inside temp. Staying 20 to 25 deg. Below outside temp. Live in Apache junction AZ. So moral to story cooler air in much colder comes out. Happy trails