This is a 2003 motorhome on a W22 chassis/8.1L engine. Dash A/C is an Evans Tempcon RV218552, R134a. (Evans phone and email worthless).No cold air comes out when activated. It makes a buzzing sound for 3 seconds..and silence for 5 seconds. Another 3 seconds of buzz and 5 seconds of silence. This goes on forever.Heater works OK, with same noise/silence cycles. Any ideas as to what is wrong ?

I would take it to an AC Guy for evaluation.Does the clutch engage?Does the compressor turn?

As said above, anyone that fixes AC units can tell you what is wrong. It sounds like the clutch is going on and off maybe from a low charge.

Open the windows and enjoy fresh air.

yep ,ac units most the time need a ac service guy. some times a recharge will get you cold air.

Send me a PM and I'll send you an Evans manual. Sure it's not a Denso?

Dash A/C not working...advice, please ? | Good Sam Community

1995brave
Nomad
Oct 05, 2018
Noel wrote:
Had a friend go under coach when running A/C. He saw belt/pulley jump a bit when the buzzing cycled. Noise is under coach, in back of two thermostatically controlled fans...only one was running. Ambient air was 50 deg and incoming dash air was 46 deg. Felt both A/C hoses and one was not colder than the other.

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Looks like you may have three problems.
1. Cooling fan for radiator bad.
2. Belt too loose or compressor clutch going bad.
3. low on Freon.
Noel
Explorer
Oct 05, 2018
Thank you all for your replies. When I go to a service center, I will have made lots of notes and possible solutions.

THANK YOU...
Noel
Explorer
Oct 21, 2018
Back from service. Low R134a was the problem. Probably the compressor seal dried out because I had not turned on A/C in 6+ months. Lesson learned. Will keep an eye out to see if the seal has been damaged.