This may have already been covered somewhere so forgive me if it has.My Coleman a/c which is 21 years old with very little use works great at night but when the temp is over 100 degrees in the daytime it blows cold for a few minutes then the compressor shuts of for a few minutes then come back on and starts blowing cold again. It will do this over and over and never cool trailer down. I was thinking perhaps it is low on freon but I read that they are a closed and sealed system. Could an rv tech check it if I took the unit to him?

What is the voltage in the RV? Low voltage is hard on the motor.Otherwise the cycling points to excess current through the compressor indicating the motor is about shot. At 21 years it would be OK to just replace the upper unit.

An R/V tech will tell you that you need a new A/C so be sure the guy you calls is also willing to replace it or you will have to pay a 2nd service call from someone who will. There's almost nothing to check other than to see if the fins are cleans and the inside filter is clean. If you can get on the roof you can do this yourself. You can't recharge the unit. There is a slim chance it could be the start capacitor but I don't think it would make any difference if it was hot or less hot outside.

Does the evaporator have frost on it when it stops working?

time2roll wrote:What is the voltage in the RV? Low voltage is hard on the motor.Otherwise the cycling points to excess current through the compressor indicating the motor is about shot. At 21 years it would be OK to just replace the upper unit.Trailer is plugged into the house so I'm assuming it has the full 120 volts. It doesn't trip the breaker in the house or the trailer.

Along with the other questions, what do you have for a power cord and where are you using it? If this is at your home on a lightweight extension cord to a 20 to 30 amp pigtail, it's likely the cord is getting hot and causing your voltage to drop.

A/C works at night only | Good Sam Community

24 Replies

TravelinDog
Explorer II
Aug 07, 2018
time2roll wrote:
What is the voltage in the RV? Low voltage is hard on the motor.

Otherwise the cycling points to excess current through the compressor indicating the motor is about shot. At 21 years it would be OK to just replace the upper unit.

Trailer is plugged into the house so I'm assuming it has the full 120 volts. It doesn't trip the breaker in the house or the trailer.
sgip2000
Explorer
Aug 07, 2018
Does the evaporator have frost on it when it stops working?
Bill_Satellite
Explorer II
Aug 07, 2018
An R/V tech will tell you that you need a new A/C so be sure the guy you calls is also willing to replace it or you will have to pay a 2nd service call from someone who will. There's almost nothing to check other than to see if the fins are cleans and the inside filter is clean. If you can get on the roof you can do this yourself. You can't recharge the unit. There is a slim chance it could be the start capacitor but I don't think it would make any difference if it was hot or less hot outside.
time2roll
Nomad
Aug 07, 2018
What is the voltage in the RV? Low voltage is hard on the motor.

Otherwise the cycling points to excess current through the compressor indicating the motor is about shot. At 21 years it would be OK to just replace the upper unit.

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A/C works at night only

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