Dash Air quits after an hour or so 2005

[big katuna]

Just started ths month. System is full and blows ice cold when it works.

The first time, it happened when I started the genset while driving. I kept driving and after the coach had been shut off a few hours, I started it and it was ice cold again. I thought it might have been the Xantrex kicking in.

Drove it again this past weekend and it stayed on the entire two hour drive, no genset running.

Driving home yesterday, no genset, it blew cold about an hour and stopped blowing cold. Pulled over, shut it off a few minutes, still no cold air. Dash fan and evap fan run. When it quits it is instant, not a gradual warming.

Thought I would start by bypassing the low pressure switch. Where is it on an 05 and what does it look like. Any other hints?

[jdoc]

2005 what?

[big katuna]

Sorry.

2005 FL XC 38N Expedition. 300 CAT. Identical to yours.

After it sat about 4 hours, it is blowing cold again. That was yesterday. This AM, I started it up and it is blowing cold.

[Harry B]

Could bebe moisture in the freon, causing the expansion valve to freeze up. Try warming up the expansion valve with a hair dryer to see if it starts blowing cold air again.

[Jimmyzw22]

Don't know about that model but on my HR Endeavor there is an electric valve that brings the hot water to the heater core for dash heating. The electric valve does not hold and hot water is allowed to flow when not wanted therefore stopping the cooling. I found the valve confirmed that was what was happening and installed a manual shutoff valve in the heater hose. It sounds like the same thing, once the water heats up the valve allows hot water to cancel out the cooling as the heater core and ac core are one in front of the other.

[big katuna]

Quote:

Originally Posted by Jimmyzw22 Don't know about that model but on my HR Endeavor there is an electric valve that brings the hot water to the heater core for dash heating. The electric valve does not hold and hot water is allowed to flow when not wanted therefore stopping the cooling. I found the valve confirmed that was what was happening and installed a manual shutoff valve in the heater hose. It sounds like the same thing, once the water heats up the valve allows hot water to cancel out the cooling as the heater core and ac core are one in front of the other.

Thanks, I'll look at that. Seems like if it was that, if you turned the AC off it would get hotter, which mine didn't; I turned it off to see if the evap had frozen and it still blew room temp air.