A/C roof unit

Be careful fooling around with those capacitors ,you could get the shock of your life......some very sharp people on here should explain capacitors.....

Before you go to far ,are you sure compressor is really running and not just the fan, many fail because of the quick start capacitor. I even keep a spare , If so get number, check out e bay my spare cost 18.00. Remember they are sealed system like home refrigerator leaks do happen but not often.

Have you tested the temp difference between inflow/outflow - if it's around 20 degrees then the units working as designed.

Not positive but if you have to replace the unit you might be able to get away with replacing only the upper portion - if you provide your AC model number to seller he should be able to confirm whether new unit will fit/match with current setup.

Golden, I just thought it might save a few bucks to use the old one.

Matt, I was on the roof. The condenser and evaporator are both very clean. I pulled the ceiling filter off right after I bought this coach (October 2012) and cleaned it then.

I'm really not WANTING to replace the a/c but looking at the age.....it might be more cheaper in the long run.

Mgdoc,

Before you do anything else, find the internal filter and clean/replace it, then go up on the roof, take the cover off and clean both the condenser and the evaporator. That may just bring it back to life.

Recharging old units is a Crp-shoot at best. If you don't have a friend that can do it, it will probably cost more than a replacement.

Matt

Hi,

I fixed a rooftop A/C for a friend, and it took me about 4 hours to go home, get my tools, solder on a new freon fitting, fix the leak, and evacuate, recharge the system. At the normal rate of $75 per hour, it would have been a expensive fix. Some places charge more per hour than that.

Normally the replacement A/C will come with a new housing for the inside. Any reason you want to keep the old one? It might fit, it all depends on how much has changed over the years. Normally they keep things about the same, but the replacement might be a bit different. If it is only to keep the "Solar on" light, then I would disconnect that LED from the old inside frame, and put it someplace out of the way inside the roof, leave it there, out of sight. It really does not do much to keep the battery charged anyway. The LED solar on light is on when it is light outside, off at night. Really no help to tell you it is sunny out anyway.

Good luck!

Fred.

mgdoc wrote:
My Coleman Mach roof a/c unit is not cooling well and I'm thinking of replacing it. It's about 15 years old. I've already been on the roof to remove the cover and clean the unit. It was clean as a whistle and I saw no issues. I did notice that it has no fittings to recharge. I also noticed no leaks, assuming that there would be oil stains as in automotive a/c leaks. My question is, do I have to replace the ceiling assembly at the same time? Will the older ceiling assembly work with a new roof unit?

I had an AC gut come out and put the charge fittings on an RV I had. He did the fittings and a recharge for less than $200 bucks. Unit worked like new when he was done.