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Old 11-01-2014, 04:24 PM   #15
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Depends on the motorhome. On the way to Las Vegas, my dash A/C quit blowing cold. The dash vents are used for both heat and cold, depending on which way a pneumatically-actuated flapper is positioned in the big black box under the dash. It seems there is a miniature 12 VDC electric pump in front of the firewall that feeds a nearby plastic bulb reservoir. I found where the wire connector had come off. Voila...cold air coming out the vents once again. The mfr name of this air box system escapes me right now...but probably used industry-wide.
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Old 11-01-2014, 04:39 PM   #16
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Originally Posted by kaosktrl View Post
Hi N0oby here, still shopping it out and I see alot of "Dash does not blow cold" in descriptions .It seems systemic, across the board make years price Doesn't really matter. Is there something I need to understand ? Thanks in advance
Our dash air conditioner didn't blow cold air when we bought our coach several years ago. I had the system recharged a couple of times, which made the air conditioner work for a while, but not long. Last year, I had the system worked on by a qualified air conditioner technician. He replaced a couple of items, flushed and filled the system. Touch wood, it has been working fine since. Before that, we had a couple of trips where we had to rely on the roof air conditioners. That's OK. But it is nice to have the dash air working.

Most of the dash air conditioning/heating systems in our coaches are actually designed for smaller vehicles, so these systems are marginally effective. If it's 100F outside, I doubt the dash air will be able to cool the entire coach on its own. If it's -20F outside, I doubt the dash heater will be able to heat the entire coach on its own.


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Old 11-01-2014, 04:51 PM   #17
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Welcome to irv2.
The Evan's control valve if installed in correctly can eventually produce out of the dash vents warmer air than cool air.
This has been a problem since 2003 on my coach and a new owner of a 2013 decided to look into what the problem might be, this thread will show what was found.
Since I had a problem back in 03 I installed a ball valve to close of the hot water from radiator from entering the Evans AC/Heater unit.
Now if coach does not have the Evans unit you should not have this problem.
Good luck in your hunt.
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Old 11-05-2014, 01:38 PM   #18
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Dash AC vs running Generator & AC units

Let me just say from the start I am new to RVs. However, while receiving my orientation to 43' Dutch Star; information I understood was running the engine system with AC from dash causes more overall fuel consumption than running engine with Generator and using onboard AC units.

Thoughts?
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Old 11-05-2014, 06:58 PM   #19
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Between the dash and over the road air our whole coach gets pretty cool.
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Old 11-06-2014, 08:48 AM   #20
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Dash A/C may fail for several reasons.
1: (#1 in my opinion) is preception.. The Automotive Dash A/C is designed for a car or truck, it is not designed for a motor home, it simply does not have the BTU's needed to counter the greenhouse effect of the windshield or to cool that many cubic feet of house. Thus it's working perfectly, just not getting the job done.

2: Loss of refrigent (NO it is not freon any longer) (added 12 oz to my 9 year old system this spring)

3: Failed hot water valve causing hot water to flow in heater full time.

Those are the most common causes.
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Old 11-08-2014, 08:22 AM   #21
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Let me just say from the start I am new to RVs. However, while receiving my orientation to 43' Dutch Star; information I understood was running the engine system with AC from dash causes more overall fuel consumption than running engine with Generator and using onboard AC units.

Thoughts?

I'd say whoever gave you that info wasn't very bright, or didn't have much of a grasp of mathematics.

A generator would burn ~0.5 gallons / hour even if it's not doing anything, ~1 gallon / hour with a couple rooftop units running.

A typical engine-driven A/C compressor takes ~5 hp. and even then only when it's cycling. I doubt you'd ever be able to measure the consumption difference with a 40' unit going down the highway whether the A/C was running or not.
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Old 11-08-2014, 08:59 AM   #22
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x2-- Agree just remember the Evans control problem noted it takes a while before the control valve breaks down and allows the hot water into the same AC cooling unit that the Evans valve is suppose to block.
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Old 11-08-2014, 03:34 PM   #23
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We just had our AC serviced and indeed one of the fittings on the compressor had begun to leak. Fix not only included a new line (not just the fitting) and the installation of an over pressure valve (as well as drier of course) it's a long run from the compressor to the evaporator lots of vibration it can understand a failure. Before this problem dash air was doing a great job here in coastal Texas
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Old 11-08-2014, 03:52 PM   #24
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Originally Posted by kaosktrl View Post
Hi N0oby here, still shopping it out and I see alot of "Dash does not blow cold" in descriptions .It seems systemic, across the board make years price Doesn't really matter. Is there something I need to understand ? Thanks in advance
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Old 11-08-2014, 07:55 PM   #25
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Mine does not work because it is low on coolant, but I just run the roof a/c anyways. The summers here in AZ just get too hot for it and the dash a/c puts a drag on the engine (454) going up the mountains.
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