"Kinda" Air Conditioing

This is our 8th year on this MS and have done well with one a/c all that time and we have spent a lot of time in very hot weather. However, living in it, we try to escape north in the summer!

A/C failed once and capacitor was replaced and not sure if the guy cleaned it all out inside up top as you mention - filters, etc. He did tell me to keep the coils clean which I have done.

I think I will try to get an a/c guy out later today at our next stop - we should be there by noon and will be there today and tomorrow.

If it is the filters this sounds easy enuf to have taken care of. If it has lost charge I am not sure if this means new unit or not....maybe it can be addressed.

If it means a new unit we might have to limp along until we get home and that would not make us happy campers....October is a long way away!

TXiceman wrote:
When was the last time you cleaned the return air filters? If you pull them, you can take a flash light and look up into the unit and see the evaporator coil. If then are not bright aluminum, they need to be cleaned.

Next, run your fan(s) on high only. Summer heat in AZ needs 2 A/C units to cool the trailer.

With the unit running on high for at least 10 minutes, take an inlet temp reating for the air at the unit and then one at the closest outlet. Use a thermometer and not an infrared temp gun. It will not measure air temperature, but will read the closest hard surface. You want the air temps.

The outlet air should be 18 to 20 degF lower than the inlet temp. If you are in this range, the unit is doing all it was designed to do.

Next, setting the thermostat lower and lower will do nothing to get the unit to cool more or faster. Set the thermostat for about 75 degF and leave it there.

Keep windows and shades closed. Start cooling the trailer early in the morning before you need it.

If you have been on the road, all day in high temperatures, you not oly have to cool the air in the trailer, but also, the walls and furniture. That is a huge heat load and it may take until late in the evening to get the RV cooled down.

The post from mdcamping is not correct.The least likely problem with the unit is low on charge. Also, with the age of the trailer, it most likely has a compliant scroll compressor and it does not have valves like a piston compressor. 90% of the RV A/C problems are generally related t low or poor air flow.

Ken

The op said the out door unit is clean, "I'm going on that info". Reed valves or scroll, compressors fail and systems loose charge, especially when a/c equipment are subject to harsh conditions. I've worked on enough of them.

Sorry you are incorrect

Mike

When was the last time you cleaned the return air filters? If you pull them, you can take a flash light and look up into the unit and see the evaporator coil. If then are not bright aluminum, they need to be cleaned.

Next, run your fan(s) on high only. Summer heat in AZ needs 2 A/C units to cool the trailer.

With the unit running on high for at least 10 minutes, take an inlet temp reating for the air at the unit and then one at the closest outlet. Use a thermometer and not an infrared temp gun. It will not measure air temperature, but will read the closest hard surface. You want the air temps.

The outlet air should be 18 to 20 degF lower than the inlet temp. If you are in this range, the unit is doing all it was designed to do.

Next, setting the thermostat lower and lower will do nothing to get the unit to cool more or faster. Set the thermostat for about 75 degF and leave it there.

Keep windows and shades closed. Start cooling the trailer early in the morning before you need it.

If you have been on the road, all day in high temperatures, you not oly have to cool the air in the trailer, but also, the walls and furniture. That is a huge heat load and it may take until late in the evening to get the RV cooled down.

The post from mdcamping is not correct.The least likely problem with the unit is low on charge. Also, with the age of the trailer, it most likely has a compliant scroll compressor and it does not have valves like a piston compressor. 90% of the RV A/C problems are generally related t low or poor air flow.

Ken

If the temps coming out of your vents are somewhat cooler, it telling me either the compressor is low on charge or the valves on the compressor are failing.

Is this is especially true if the supply air temps have slowly regressed warmer.

I Think the best bet would get someone qualified to look at it.

Good luck
Mike

"I have checked the unit on the roof and it is all clean inside."

Did you remove BOTH covers.......the outside shroud (gets you access to fan motor/condenser coil) AND the sealed cover over the evap coil.

Return air filter needs to be clean AND the evap coil needs to be clean (as does the condenser coil).
The evap coil cools the air that blows into RV
The condenser coil cools the coolant so evap coil can cool the air
The air filter helps keeps the evap coil clean.

Try this...
Check and clean the foam filter inside. pull down the cover on the ceiling, take out the black sponge/foam filter, wash it carefully and dry it.

This: