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OTR Air Dash Light ?
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Jon, since there was a little bit of pressure in the system, I thought there could be no moisture, so I went ahead with the charge, no regrets. I liked learning that the clutch and fans worked.
So now I will pursue the hardest task, finding a competent pro.
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As you open the valve and install the gas the freon jug gets cold ant the pressure in the jug goes down,get a 5 gallon bucket and fill it half full of hot water and put the freon jug in it,the pressure will come back up and the freon will flow from the jug to the compressor.
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Thanks for that idea Jack. It reminds me that 30 or 40 years ago when my cars leaked freon, I would put those 12 oz. cans in a hot water bath to speed up the flow. Thanks for the reminder.
Been calling around a bit for someone to vacuum the system. Called a friend who owns an independent appliance store (since 1959), and he does not want to do it, but will loan me his larger vacuum pump so I can do it. But first I’m ordering today from Prevost Parts a new filter/dryer to install.
If anyone has vacuumed before, any tips will help.
After thinking about yesterday’s procedure to charge the system, I may have caused the problem. I forgot to purge the line from the tank to the compressor with freon before I started the charge.
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If you vacuum the system that makes the ideal time to fill, starting with liquid at the receiver, and then topping it off at the suction side of the compressor with gas.
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Dan,
Not sure if you have already thought of this…. But give Prevost Customer service a call… I had a Dash Air issue and was not near any of their service centers but they got a tech on the line to help trouble shoot the problem and then helped me find a place that could help me on my route… actually called them… explained the issue, made the appt for me and then followed up several times to make sure it all went well.
My bus is a 2007 and I am not the orginal owner… they didn’t care and I was blow away by that level of customer service….
So if you are still looking for a pro to look it over… you might give them a call and see if they can help…
Good Luck
Bill
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Found a Pro to evacuate, and charge the system today, and we are done. Evacuated to 29.9 hg (mercury on the periodic table), put in some yellow leak detector, and some oil, and 25 pounds of r134a. No leaks were found at the time, but will be able to easier see one when it happens now
Major discovery of a minor detail: When we rotate the valve studs on the hi and lo sides of the compressor to open the valves, ONLY turn them 3 or 4 times 360 degrees. The maintenance manual says to turn them 3 or 4 “turns”. Well what is a “turn” 90 degrees? 180 degrees? 360 degrees? So I opened them until they stopped. That caused a blockage in the hi side exit valve, not allowing the compressed gas, now a liquid, to get to the condenser. That caused about 400 pounds of pressure on the high side and blew a fitting off the hose attached between the test gauge and that hi compressor port. Luckily no damage to anything or anyone.
The only new part in the system is the dryer/ filter located in the starboard condenser bay. Henry part number 815030. According to Prevost parts that was used on their r12 systems. So this is evidence that mine was converted to r134a some time ago. Man, I’m done with this thread. Happy trails.
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