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Old 09-19-2019, 04:25 PM   #1
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Dash A/C not working

I am looking for the location of the compressor clutch relay. There is no power going to the compressor but there is power at the the thermostat and pressure switch in the front of the coach. I have talked to Newmar, freightliner and Evans and they all keep passing the buck. It’s absolutely ridiculous to get any kind of diagram or schematic that is accurate. I will try again tomorrow but was hoping someone here might know where that really is.
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Old 09-19-2019, 04:58 PM   #2
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I believe that the truth would be , they don't know for sure where the Newmar employee mounted it; and they're afraid to say that!
Freightliner won't know because they didn't install the dash portion of the A/C .
Evans won't know , because even if they supplied a relay with the unit , they shipped it to Newmar in a big box with the whole HVAC assembly.

The Evans schematic I have that came with my vintage unit doesn't even have a relay shown.
But I know for a fact I have one , because I followed the wiring from the Newmar installed circuit breaker ( marked dash air conditioning) until I found it. Hidden; unmarked ; on the firewall behind a bundle of other wiring. Same thing for the low pressure switch , hidden behind wiring.

What I'm trying to say is even if someone with the exact same unit as you comes in and says where his is , unless the same employee happened to have mounted the relay in his favorite place , the description you receive could be out by 3' or more.
I would think that the wiring Newmar does on there newer coaches is way better than mine , but some things are still in the hands of the final installing employee.
Take a deep breath and look things over again , follow the wire from the thermostat to the pressure switch then from the pressure switch , see if you can find where that wire joins the Freightliner chassis harness , my relay was after the pressure switch , and before the chassis harness.

EDIT: About the only question to as Newmar about your issue would be
" Do you ( Newmar ) install a relay along with the dash HVAC assembly wiring ?" Hopefully you can get that answered.
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Old 09-19-2019, 07:17 PM   #3
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Quote:
Originally Posted by Skip426 View Post
I would think that the wiring Newmar does on there newer coaches is way better than mine
It's not.
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Old 09-19-2019, 07:17 PM   #4
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short the pressure switch to see if you are low on freon. The relay might just be doing it's job.

I am guessing the relay is up front near the expansion valve. Just a guess.
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Old 09-20-2019, 06:05 AM   #5
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On my 2016 Dutch Star when my Dash AC quit working, first intermittently, then would not come on at all, after 3 trips to Freightliner, found a defective AC capacitor which in my coach was in the drivers bay where the fuses are. Just a thought.
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Old 09-20-2019, 06:19 AM   #6
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On my 2016 Dutch Star when my Dash AC quit working, first intermittently, then would not come on at all, after 3 trips to Freightliner, found a defective AC capacitor which in my coach was in the drivers bay where the fuses are. Just a thought.
An AC capacitor for dash air? Never heard of that....now, the A/C powered roof top units DO have a start capacitor. By chance - mixing the two up?
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