Dash air

Topic: Dash air (Read 2304 times) previous topic - next topic

Dash air

June 11, 2017, 07:45:12 pm

Latest , latest issue is dash aircon quit , headed north to bend Oregon from Stockton CA via 99 to Sacramento then the 5 to bend.
If anyone has a recommendation for a reliable shop or mobile tech I would appreciate it .
Thanks jim

Re: Dash air

Reply #1 – June 11, 2017, 07:51:27 pm

Jimmy,

You might look to see if the engine belt has jumped off the A/C pulley. Next guess, you are low on freon.
Jim

2002 U320

Re: Dash air

Reply #2 – June 11, 2017, 07:59:14 pm

Checked the belt and all looks good, I suspect low freon which suggests a slow leak somewhere.

Re: Dash air

Reply #3 – June 11, 2017, 08:39:32 pm

Is the condenser fan coming on? You can jumper the pressure switch to get to test.

Re: Dash air

Reply #4 – June 11, 2017, 08:46:24 pm

Dont know how far you are staying on 5 but if you get to Eugene, could try Oregon Motorcoach Center. They are a Foretravel service center, have been happy with work they have done. Have no experience with them on dash ac.

Re: Dash air

Reply #5 – June 11, 2017, 09:45:51 pm

X2 on Mike's recommendation for Oregon Motorcoach. We had service done there twice in the past - happy results both times. They honor the Motorcade Club 10% discount on parts and some labor charges, just like if you were at the factory in NAC. Very nice shop. They have 50A plus water hookups in the parking lot - free to customers if you stay overnight.

Call ahead, because they are very popular with all premium coach owners! That's us hangin' out with the big boys.

Oregon Motorcoach Center | Premium RV Service | Eugene, OR.

Re: Dash air

Reply #6 – June 11, 2017, 10:34:01 pm

Edit head pressure control/condenser fan control on most automotive systems is most likely a ref liquid temperature sensor down stream of the coil. Ref flows through the smaller line from the compressor thru the condenser coil. Condenser fan is on a fuse somewhere. Compressor has an electric clutch also on a fuse, wire to the clutch can be on the front or back of the pulley and can vibrate off. Slow loss of freon is a gradual change, but a ruptured hose is immediate.

Re: Dash air

Reply #7 – June 12, 2017, 12:42:21 am

What does 'quit' mean? Warm air, no air movement, air from wrong vent, etc.

Re: Dash air

Reply #8 – June 12, 2017, 12:51:06 am

Air temp from dash vents is same temp as ambient outside air , switching to aircon does not reduce the air temperature from vents

Re: Dash air

Reply #9 – June 12, 2017, 09:48:55 am

On our coach the refrigerant compressor has two in line pressure switches that open to turn off compressor's pulley clutch coil. One is for high pressure and one is for low pressure. Sometimes there is a single combined switch. If a switch fails it can temporally bypassed by jumping the switch points to diagnosis them.
Others have pointed out other things to check.

Re: Dash air

Reply #10 – June 12, 2017, 10:29:09 am

I can see two sensors in the lines coming out back of the compressor , is this the switches you refer to

Re: Dash air

Reply #11 – June 12, 2017, 12:56:41 pm

Looks like pulley and clutch are operating,

Re: Dash air

Reply #12 – June 18, 2017, 05:41:51 pm

Planning on hitting Oregon motor coach on return trip south
if anyone has recommendations in coeur d Alene ( week stop over ) or surrounding area , would love to hear it . Suddenly its awfully hot !!

Re: Dash air

Reply #13 – June 18, 2017, 06:05:39 pm

Quote from: Jimmyjnr – June 18, 2017, 05:41:51 pm

Suddenly its awfully hot !

Crank up the generator and turn on the roof A/C. It works better (IMO) than the dash A/C going down the road, and when you stop driving for the day, the whole coach is already nice and cool for the evening's activities.

Re: Dash air

Reply #14 – June 18, 2017, 06:24:51 pm

I have had Byers International, Bern'd, MOT, and FT all try their hand at getting my A/C to blow cold air, and none of them was successful. But I can say I have spent close to 2 coach bucks for warm air. My next attempt will be to inject dye into system and look for the leak with UV light. Maybe I should dump the a/c and install another roof a/c and run all the a/c with generator. 3 a/c in a 34' non slide should cool her down.

Re: Dash air

Reply #15 – June 18, 2017, 07:17:35 pm

Quote from: Jimmyjnr – June 12, 2017, 12:56:41 pm

Looks like pulley and clutch are operating,

IIRC ours (also 2003) first time (2009) was the clutch, fixed at FOT. Second time (last November) was a switch or something on the condenser fan control. Issac (then at OTM, now at Infinity) diagnosed and repaired.

Re: Dash air

Reply #16 – June 18, 2017, 08:05:44 pm

I'm really scared to jinx myself on this one. Had MOT look at our dash air two years ago. They got it to work for about 3-4 months. Next time they found a broken fitting. That lasted for over a year. Last fix was some freon and remounting our compressor. After that we had a problem of water leaking from the evaporator coils. Cleared drain tube and for two hundred miles it has been working great.

When it works it really does a pretty good job. I just hope it keeps working well.

Len

Re: Dash air

Reply #17 – June 18, 2017, 08:22:35 pm

four years ago new compressor, three years ago new connections to compressor
Two years ago new something?? Valves
Each time it was also cost of evac and refill , really would like to find tech whom knows and cares about the work in hand .
Not just booking hours and doing the easy fix

Re: Dash air

Reply #18 – June 18, 2017, 08:33:25 pm

Find my threads about the dash A/C. Mine blows nice and cold and it's all I use on the road. Unless it is a SUPER terrible hot day, it even keeps the humidity low enough to make the rear of the RV comfortable.

Re: Dash air

Reply #19 – June 18, 2017, 09:22:40 pm

Is there a condenser/ dryer unit that I can check / service??
Sorry to sound so dim

Re: Dash air

Reply #20 – June 18, 2017, 09:29:18 pm

Just checked the fan operation on the dash air radiator and it's running also
no " obvious " leaks .
Was hoping for an easy fix !

Re: Dash air

Reply #21 – June 18, 2017, 09:32:08 pm

While it might not seem like you're making headway, you are - you're ruling out some of the things that could cause the problem.

Re: Dash air

Reply #22 – June 18, 2017, 09:34:55 pm

Ha
Thanks Michelle, by the time I understand all the systems on this coach I will be ready for a newer more complex one !!

Re: Dash air

Reply #23 – June 18, 2017, 09:39:22 pm

So the dash fan and door system is working, the compressor pulley is spinning and clutch is engaged, the fan on back of radiator is running, so that leads me back to loss of refrigerant?

Re: Dash air

Reply #24 – June 18, 2017, 09:41:52 pm

It is pretty hard to diagnose the system without having gauges hooked up to see the pressures while it is running. You can get a set of gauges from Harbor Freight for about $50.00.

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