Community Forums

okie mopar · 06-22-2016, 02:39 PM

I caught in a lock down on the road yesterday evening it starting running real warm so I turn the dash air off. Today I could never get it to blow any cold air. Could it have blown a fuse some where? It had been working at least some but all it blows now is hot air. Where do I start??

Skip426 · 06-23-2016, 09:09 AM

Unfortunately the high temps may have caused a leak in the system .
Check, visually, to see if the compressor clutch is cycling while the engine is running , if it does not then you'll have to locate the systems low pressure switch to check for 12v power to the switch ; and through the switch when the engine is running . This will give you an indication that you have lost refrigerant from your system .
I have a picture of the low pressure switch in my system I'll post it so you know what to look for.

Skip426 · 06-23-2016, 09:37 AM

Here's the picture of a low pressure switch , if you have 12v power to the switch and none though it you will have to have your system checked for leaks.

okie mopar · 06-25-2016, 03:00 PM

OK, I'll check that next, the comp doesn't kick on when it is turned on. The shop told me it was the switch on the high pressure line with the 4 wires on it. Replaced it this morning and still had nothing. I will check this other switch before I do any thing else.

okie mopar · 06-26-2016, 05:41 AM

Where do I look if I have 12 volts from both sides of the switch ? Is there a fuse are breaker for the compressor? Thanks Ronnie

spritz · 06-26-2016, 06:02 AM

Hello,
My dash air on my PA works but won't cool off the rest of coach. I start the Gennie and turn on 1 of my Rooftop AC units and am a cool cat driving down the HWY.
I don't even bother anymore using the dash Air.
Tim

Skip426 · 06-27-2016, 10:38 PM

Quote:

Originally Posted by okie mopar

Where do I look if I have 12 volts from both sides of the switch ? Is there a fuse are breaker for the compressor? Thanks Ronnie

The compressor is powered through the low pressure switch , the lubrication oil for the compressor circulates with the refrigerant , and the system won't allow the clutch to engage if the pressure is low. Power through the switch should indicate enough pressure for the system to operate.
Can you access the wire to the compressor clutch and test for power there ?
Can you look for the name , Evans , anywhere on the A/C system , they're a major supplier of RV , A/C systems and I think I have a wiring diagram for their systems.

KeithV · 06-28-2016, 12:44 AM

Quote:

Originally Posted by okie mopar

OK, I'll check that next, the comp doesn't kick on when it is turned on. The shop told me it was the switch on the high pressure line with the 4 wires on it. Replaced it this morning and still had nothing. I will check this other switch before I do any thing else.

I had the same problem due to an air leak on the vacuum under dash switch.
Upon acceleration the cold air disappears sometimes and blows hot air.
I replaced the vacuum tubes and the problem disappeared.
Could also be a sticky switch on the vacuum.