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Old 08-21-2020, 11:09 AM   #1
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2008 Dynasty Dash Air temps

Wondering what you all see for air temp out of the dash from your AC? Of course I am in AZ, it was 113 but saw nothing lower than 62 degrees, and even with the roof airs running it was “fine” but cooler would be better.
I bought one of those Part store AC Refill kits, added about 32 ounces of 134a and the gauge reads about 32 pressure, says I can go to 40 pressure, just wondering if the 100 dollars in Freon is worth it or is that the best Ill see?
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Old 08-21-2020, 11:54 AM   #2
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We've resigned ourselves to just running the generator and front AC when it too hot for the dash AC to work. The dash AC isn't large enough to cool the whole front portion of the coach.


That way when we get to our destination the coach is cool already. If it is really hot we'll turn on the rear AC at some point to start cooling off the rear of the coach also.
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Old 08-21-2020, 01:20 PM   #3
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We've resigned ourselves to just running the generator and front AC when it too hot for the dash AC to work. The dash AC isn't large enough to cool the whole front portion of the coach.


That way when we get to our destination the coach is cool already. If it is really hot we'll turn on the rear AC at some point to start cooling off the rear of the coach also.

We had all 3 running, maybe it is just too much heat, I am actually OK, wife sites so far away from dash she gets hotter, going to use the floor fan for her today leaving Lake Havasu to Vegas, will be 113 on the drive UGH, Can’t get to Montana fast enough.
Last Monaco we had the INSIDE of the windshield UV coated and made a big difference, will need to do that on this one
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Old 08-21-2020, 01:25 PM   #4
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One should be very cautious about using those r134 cans. Some have leak stop added. This will plug your system. Actually walmart carries r134 that is pure. Also very inexpensive.
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Old 08-21-2020, 01:27 PM   #5
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I should have added that we run the front roof air and the dash air. Works fine at 90 plus temps. 08 Dynasty
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Old 08-21-2020, 01:35 PM   #6
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By design the best delta T, cooling drop across your evaporator would be 30 deg F. That’s a theoretical number. If you are getting close to that then it’s probably the best you will do. If I get 26 I am happy
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Old 08-21-2020, 01:59 PM   #7
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By design the best delta T, cooling drop across your evaporator would be 30 deg F. That’s a theoretical number. If you are getting close to that then it’s probably the best you will do. If I get 26 I am happy
26 degrees I was at 60 degrees
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Old 08-21-2020, 07:42 PM   #8
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26 deg below ambient. If the air across the coil is 90 then 60 coming out the ducts would be the 30 degree Delta T. Or 100 deg in then 70 coming out
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Old 08-23-2020, 10:14 AM   #9
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I haven’t checked my temperature from the dash air, but it keeps us cool in Michigan. In hotter climates it can’t keep up, so we run the genset and our roof air units.
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Old 08-23-2020, 02:30 PM   #10
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Yep, run the dash until it gets too warm then start the genny and run the roof airs. We run the front and rear roof units as we get a lot of engine heat in the back. I don't recall ever needing to run the center roof unit, the front and rear seem to be enough while traveling. However when it's 113 and we're just sitting, then all 3 are on line and pumping cold.
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Old 08-23-2020, 03:05 PM   #11
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Quote:
Originally Posted by Paulroughton View Post
Wondering what you all see for air temp out of the dash from your AC? Of course I am in AZ, it was 113 but saw nothing lower than 62 degrees, and even with the roof airs running it was “fine” but cooler would be better.
I bought one of those Part store AC Refill kits, added about 32 ounces of 134a and the gauge reads about 32 pressure, says I can go to 40 pressure, just wondering if the 100 dollars in Freon is worth it or is that the best Ill see?
Dropping the air temp from 113 to 62 is a 51 degree drop, so pretty good as far as I'm concerened.

I don't know where the idea of a max of 30 degree drop came from.

The coils in your evaporator will be well below freezing, that's why you get icing up in high humidity areas.

Happy Glamping.
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