| Author |
Message |
Roy Strickland
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 19, 2005 - 5:09 pm: | |
I got the A/C serviced. The technician could not find whichever component has the floaty ball deal. The A/C will run decent at idle as long as you want it to. You start to go, it quits. My father and I think the freon may still be a little low. I'll stop from driving, let it sit a min. and it will cut back on. So for my $140, we are halfway there! Which is better than nothing.
So, can another RTS owner tell me where the canister with the floaty ball is for the A/C guy? (I am gonna look back at my old posts, someone told me what pressures the system ought to have, so if nothing else I'll go by that.)
Also, what would cause the compressor to stop turning when you start driving? I assume it has something to do with the RPM increase causing it to cut out for whatever reason. Any insight will help, we are really close to getting the bus functional. It's too hot in south GA for no A/C. Thanks again for all the help!
RS |
Roy Strickland
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 19, 2005 - 5:47 pm: | |
UPDATED: I JUST CONTACTED VIA SAN ANTONIO, THE ONES WHO ORIGINALLY OWNED THE RTS BUS THAT I HAVE. I TALKED TO SOMEONE WHO ROUTINELY WORKS ON THEIR AIR CONDITIONERS. HE SAID MY SYMPTOM COULD BE CAUSED BY TOO MUCH OR NOT ENOUGH FREON. FOR THE R-22 SYSTEM, HE TOLD ME: 50 - 65 PSI. ON THE LOW SIDE AND AROUND 250 PSI. ON THE HIGH SIDE.
HOW MUCH DOES EVERYONE AGREE WITH THOSE NUMBERS? I SURELY DON'T KNOW JACK ABOUT THAT. THANKS SO MUCH!!
RS |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 19, 2005 - 6:27 pm: | |
I'm no AC man, but just got through with that type problem
in our Caravan. AC is AC..
If it's cutting off, it's likely due to it seeing a too high pressure.
Aside from a faulty sensor or relay, too much refrigerant can
cause the sensors to see a high pressure and cut the pump off.
Too much oil in place of the refrigerant can cause the same
problem. If oil was added when the freon put in, that could
be your problem (that was our Caravan's problem). |
Roy Strickland
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 19, 2005 - 6:37 pm: | |
That's funny. I got a Caravan too, but the engine is messed up. I have parked it temporarily! :-) I don't believe any oil was added, unless it comes in the R-22 bottle. I was there the entire time.
WHILE EVERYONE IS READING, I FORGOT TO ASK ABOUT ONE OTHER A/C THING. NOT VERY MUCH AIR IS GETTING TO THE FRONT... ARE THERE AUX. BLOWER MOTORS SOMEWHERE ON THE WAY FORWARD THAT MAY HAVE QUIT? IT HAS A DRIVERS BLOWER, BUT IT DOESN'T BLOW MUCH AND THE AIR ISN'T REAL COLD. (BEATS THE HECK OUT OF NOTHING THOUGH) ANY IDEAS WHAT COULD CAUSE THE POOR CIRCULATION TO THE FRONT? PLENTY AT THE BACK. THANKS
RS |
john w. roan (Chessie4905)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 19, 2005 - 6:48 pm: | |
Before you mess with this bus much more, you NEED TO PURCHASE SERVICE MANUALS and learn how to do some of the servicing yourself or you will be spending a lot of money or become quickly disillusioned.This board is extremely helpful, but GET MANUALS!We don't want to lose new members. |
randy steere
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 19, 2005 - 7:49 pm: | |
Roy,
Your 65/250 pressure readings are very close to the mark. The pressure readings depend alot on the outside temperature. Your RTS has the reciever tank with the little "floaty balls" also known as the sight glass located on the top right side of the coach. Look behind the 12" squarre access panel. The air flow to the front of the bus normally will feel weak. That is why they put a booster blower in for the operator.
Randy |
Mike (Busone)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 19, 2005 - 7:55 pm: | |
If your A/C guy cannot tell if it is over charged or not he you need a new tech. Since it is cutting out when the engine RPMs increase it is probably over charged. Since you don't know the maintaince history of the system you should have all the refrigerant vacuumed out and analyzed. Make sure something else like propane has not been mixed with it. This would also be a good time to replace the dryer. The tech will need the specs to know the oil/refrigerant ratio and system pressures. |
Pete/RTS Daytona (Pete_rtsdaytona)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 19, 2005 - 8:12 pm: | |
sight glass is on the receiver tank - should be a small cover on the lower middle of the rear cap - above the rear engine door - about a foot or 2 above the rear license plate
The RTS has inspection doors over each of the vital measuring areas - water / tranny /oil / washer / a/c
you need a manual |
David Hartley (Drdave)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, August 19, 2005 - 10:27 pm: | |
I would get rid of the factory air unless you are hauling passengers and desire the mpg reduction to about 3 miles per gallon. Mine could suck the tank dry 2 times faster with that 10 tons of a/c load on the engine. I would rather use a diesel generator at 1/2 gallon per hour and run roof airs if it for personal use as a conversion. |
James Maxwell (Jmaxwell)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, August 20, 2005 - 12:08 am: | |
I have to agree wholeheartedly w/Busone. You need a new a/c mechanic, 1 that knows what the hell he is doing. Obviously he doesn't or he would know where to look for the receiver and what pressures he should be getting. Also, since you admitedly know little about this bus" thingy", you need a set of manuals as Chessie 4905 says.
Next, did he evacuate your system and check for leaks? Obviously you have one or your refrigerant would not have been gone. Once the leaks are checked for and corrected, the system needs to be deep vacuumed for several hrs. A good practice is to then put a couple of pounds of refrigerant in it and sweep the system by vacuuming it out again, changing the liquid line dryer out for a new one, then pulling a vacuum and let it set for 4 hrs. If it does not hold close to 29" of vacuum for the 4 hrs., you are wasting your money putting more refrigerant in it.
If he didn't vacuum the system, I'm venturing that your are dropping the compressor on high head when you put a load to it (increasing the rpm). Another cause that will cycle the compressor is a low charge. When u increase rpm you don't have enough refrig. in the system to keep up w/ the capacity of the compressor and the system.
Also, operating properly, your system does not run fully loaded all of the time. In fact, once the bus is cooled down into the operating temperature range and reaches the set point of the thermostat, the compressor unloads mechanically and internally. Trane compressors unloaded sequentially; 1 cyl, then another, then a third cylinder. The unloaders seek to maintain the suction pressure that the unloaders are adjusted to. You need to know what u are doing in order to do this properly. Think your a/c mechanic can handle it? |
Bob Vandawalker (Rav221)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, August 20, 2005 - 7:03 am: | |
For $140.00 I don't think the a/c tech did anything except dump coolant into a system with an unknown problem.
If you have a local transit or bus company in your area and get an opinion from one of their mechanics. Most of the time they are willing to offer free advice.
I have Orion Bus Industries about 15 miles away, I opened a dialog with a few of their guys. It has been well worth while, hell, they are more than happy to tell a novice how much they know. |