Re charging dash AC

Topic: Re charging dash AC (Read 2022 times) previous topic - next topic

Re: Re charging dash AC

Reply #50 – January 24, 2017, 11:53:11 pm

Quote from: joeszeidel – January 24, 2017, 04:29:52 pm

Well I am in a funk. I said yesterday I had 4 relays. Turns out only 3. Dave none under the bed, they are all bunched together. Today I bought a relay and started switching them out to see if that would help. No help. I checked voltage at low pressure sw. on dryer and jumpered out the sw. Still no compressor. The condenser fan does run. The two 15amp breakers are fine. Don't know where to go next. Maybe the repair shop.

Joe you've fought the good battle. It may be time for the repair shop. Try to pick one where they will let you watch and educate you while doing the repair. The knowledge will serve you well down the road.

see ya
ken

Re: Re charging dash AC

Reply #51 – January 25, 2017, 09:23:43 am

Did you check to see if the thermostat in the evaporator is calling for the compressor to run?

Re: Re charging dash AC

Reply #52 – January 25, 2017, 06:31:44 pm

Well Ken you may be right. But I'm a stubborn Hungarian who doesn't quit. Before I do quit I have to check the sw at the evaporator. My question is can I see by pulling the panel off at the passenger seat and lifting the dash or do I also have to remove the center piece as well. Can someone give a good location. I will try a jumper out to see if that works. I cant quit when everyone has taken time to try and help me.

Re: Re charging dash AC

Reply #53 – January 25, 2017, 08:34:42 pm

I look forward to seeing what resolves the problem. I have had Cummins shop, MOT, Bern'd, and FT all try their hand at fixing the A/C with no success. Replaced the compressor and dryer Bern'd, replaced the condenser at FT. still not working. Like to know of anyone that can fix it instead of throwing parts on my dime.

Re: Re charging dash AC

Reply #54 – January 26, 2017, 09:33:25 am

Trying to figure out ,are we talking about Zeidels ac or John/pats?If John/pats start from problem and explain, we love to help but
need info.

Re: Re charging dash AC

Reply #55 – January 26, 2017, 09:47:51 am

I have been following this and it about joeszeidel's problem. No power to compressor.
John did not say specifically what his problem is just that the air doesn't work.

Re: Re charging dash AC

Reply #56 – January 26, 2017, 03:54:54 pm

Well folks I tried to locate the temp. sw outside the evaporator. And I am not having any luck. I can lift the top section of dash and remove the panel to the right of the evaporator but can't figure out how to remove the front. But looking down fro the top I dont see anything like a sw. with two wires to it. Am I on the right track?

Re: Re charging dash AC

Reply #57 – January 26, 2017, 05:28:42 pm

Joe, on our 1999 U270, I believe I saw the evaporator switch on the left side of the Airbox. I could be wrong, because I wasn't looking for it while I was doing the heater core and the floor in our coach. You might try removing the panel in front of the gas and brake pedal's and turning into a pretzel to have a look.
Don

Re: Re charging dash AC

Reply #58 – January 26, 2017, 06:29:58 pm

Thanks Don, I have removed duct fro airbox on that side and will try and remove that panel. Actually I can get down there pretty easy for a 70 year old.

Re: Re charging dash AC

Reply #59 – January 26, 2017, 08:41:59 pm

We have a U280 GV so I cant advise you where the T-Stat is located in a U320 coach, but both are a 95 model so I would think the switches are very similar or the same. I have attached a photo of mine of the back side after removal.
Hope it helps,

Re: Re charging dash AC

Reply #60 – January 27, 2017, 06:31:11 am

Thanks now I know what I'm looking for. Now I just have to remove the front panel infront of the evaporator box. This thing is really on there.

Re: Re charging dash AC

Reply #61 – January 30, 2017, 06:13:56 pm

I thought I would update everyone on my AC issue. With the help of a forum member I have been making some progress. I was able to find a dwg. that better showed how its wired. First I verified that I had 12v coming into and out of the ac switch on the dash. Then I went the rear of the coach and unplugged the compressor. I connected a wire to the compressor source wire and then ran a continuity check to the plug wire going to the relay. I found that the wire was on the relay that was supposed to go to the condensor. I also verified that I had voltage on both sides of the binary sw on the drier. One wire from the binary sw. feeds the relay for the compressor. I now have three out of four wires identified. One wire to the compressor, one to ground, and one from the binary sw. The last wire should be coming from a 20amp. breaker that I have not found and it should be carrying 12v. I have found two 15amp breakers which are hot. Once I find the 20amp breaker and get 12volts. I then believe the relay will kick in and my compressor will start . John/Pat I hope this helps.

Re: Re charging dash AC

Reply #62 – January 30, 2017, 10:24:04 pm

Do you have the 20 amp breaker on the panel under bed as we do?
johnH

Re: Re charging dash AC

Reply #63 – January 31, 2017, 06:37:11 am

John there is nothing under the bed. Its interesting to note, that one of my drawings shows two 15 amp breakers and another dwg. shows two 15amp breakers plus a 20 amp breaker . What ever the case I will trace wire from relay back to a breaker somewhere. Since my coach is such an early build who knows what I'll find. I believe everything is right there behind left rear tire its just that its very dirty and with primus everything is jambed in.

Re: Re charging dash AC

Reply #64 – January 31, 2017, 07:30:25 am

Quote from: joeszeidel – January 31, 2017, 06:37:11 am

John there is nothing under the bed. Its interesting to note, that one of my drawings shows two 15 amp breakers and another dwg. shows two 15amp breakers plus a 20 amp breaker . What ever the case I will trace wire from relay back to a breaker somewhere. Since my coach is such an early build who knows what I'll find. I believe everything is right there behind left rear tire its just that its very dirty and with primus everything is jambed in.

What is the build number of your coach? Mine is 4726. I wonder how close they are.

Re: Re charging dash AC

Reply #65 – January 31, 2017, 10:31:27 am

David build number 4558 April 94

Re: Re charging dash AC

Reply #66 – January 31, 2017, 10:50:32 am

OK Joe then it may be on the board behind tire. It will be one of those little metal elongated with 2 studs and is carried in most parts stores.
JohnH

Re: Re charging dash AC

Reply #67 – January 31, 2017, 10:56:53 am

John, is the relay you are mentioning under the bed on or near the isolator panel?
Don

Quote from: John Haygarth – January 31, 2017, 10:50:32 am

OK Joe then it may be on the board behind tire. It will be one of those little metal elongated with 2 studs and is carried in most parts stores.
JohnH

Re: Re charging dash AC

Reply #68 – January 31, 2017, 11:03:00 am

my is there.
JohnH

Re: Re charging dash AC

Reply #69 – January 31, 2017, 11:17:42 am

Quote from: joeszeidel – January 31, 2017, 10:31:27 am

David build number 4558 April 94

Interesting! I wonder if it was one of the very first U320 models. Ours was built in February 1995.

Re: Re charging dash AC

Reply #70 – January 31, 2017, 12:44:21 pm

John relays, solenoids and breakers are all bunched together. I just need to sort it out. David according to Foretravel I have the first unicoach sold

Re: Re charging dash AC

Reply #71 – January 31, 2017, 01:33:35 pm

Quote from: joeszeidel – January 31, 2017, 12:44:21 pm

David according to Foretravel I have the first unicoach sold

That's neat! You own a piece of History!

Re: Re charging dash AC

Reply #72 – February 04, 2017, 03:47:29 pm

Well I am happy to report my compressor is running and the ac is blowing cold. The 20amp breaker I was searching for was hidden behind the relay I was working on The relay was actually attached to one of the breaker studs. I removed and replaced the breaker, and reconnected the wires and compressor is running fine. Thanks to all who helped me through the process and special thanks to Stump who helped behind the scenes. You dont need to know alot about AC but a little DC knowledge helps and a wiring diagram is a must.

Re: Re charging dash AC

Reply #73 – February 04, 2017, 04:24:34 pm

Quote from: joeszeidel – February 04, 2017, 03:47:29 pm

Well I am happy to report my compressor is running and the ac is blowing cold. The 20amp breaker I was searching for was hidden behind the relay I was working on.

Where in the coach are that particular breaker and relay located?

Re: Re charging dash AC

Reply #74 – February 04, 2017, 06:35:27 pm

I'm glad you found it!! My pleasure helping you out.

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