Dash Air Not Cooling Coach 1482 Resolved - Printable Version

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+--- Thread: Dash Air Not Cooling Coach 1482 Resolved (/showthread.php?tid=8451)

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Dash Air Not Cooling Coach 1482 Resolved - hypoxia - 05-22-2025

Dash A/C was cooling and then no cold air.  I put the gauges on it, the low pressure would be normal and then drop to 10 PSI.  I realized I was not hearing the condenser fan.  I crawled under the coach, the condenser and fan are in front of the drive axle differential.  Using a small screwdriver the fan spun freely & there was 0 volts at the plug.

I opened up the front Spyder Control Panel (fuse panel) in the front compressor bay & started tapping on the relays.  Voila! one relay clicked & I heard the fan running!  I was able to duplicate the problem by putting up & down pressure on the relay.  Up pressure caused the fan to quit.  I replaced the relay which resolved the problem.  

I'm still suspicious of the solder joint on the board but could not duplicate the problem once the relay was replaced.

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RE: Dash Air Not Cooling Coach 1482 Resolved - Jack Houpe - 05-23-2025

Very nice PDF file with professional picture!

Jim normally in systems that have a bad condenser fan the low side pressure would increase but your went down?

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RE: Dash Air Not Cooling Coach 1482 Resolved - [email protected] - 05-23-2025

Nice fix, love it when it’s simple. 

So my dash air worked great on the way home from when we purchased #490 and then it quit. I checked the system and there was very little to no pressure in the system, so it had lost its charge. I vacuumed the system down and checked it and it held vacuum. I then added refrigerant to the system, but the compressor was still short cycling. I noticed it was kicking out because of high pressure on the high side, so I assumed that there must be something clogging up the system. So I recovered the refrigerant from the system and then proceeded to tear everything apart. I disconnected the expansion valve and and then remove the drier as well. I then flushed everything, flushed the lines front to back, removed the lines from the compressor to do this. Flushed the evaporator and the condensers, got lots of brown sludge out of the system, assume that the drier had puked it’s guts into the system. Was going to replace the expansion valve but I had no luck finding a direct replacement, so I took it apart and cleaned it good and put it back together. Removed the compressor, dumped the oil out of it, and flushed it clean, put a new dose of oil back in the compressor. Assembled everything back, new drier installed. Then vacuumed the system, checked it and it was all good. Charged the system and found a leak on the new drier, looks like a plug that was not fully installed on it. That did not show up when I vacuumed it though, it was holding vacuum. Anyways got it all back together and charged up and now we have cold dash air again. I did notice that I am still getting a bit higher than I would like high side pressure, I think the condenser fan is not moving enough air to get rid of the heat fast enough. I washed the condenser core down while it was running  and the high side pressure came down. I am thinking about adding a second condenser fan on the front so that one is pulling and one is pushing. I may put it on a switch so I can only use the second fan when it’s really hot out, in mild temps I don’t think I will need it. I will report the results of the additional fan in the future.

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