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Over-the-Road Freon Charge Question
Good Morning – Would it be a correct assumption that if the red ball in the lower receiver site glass does not float in the middle of the lower site glass, but instead is not moving and holding steady firmly floating at the top of that lower site glass indicates the system is over-charged?
I have read that if the red ball in the lower site glass does not float at all, or floats below the mid-point, the system is under-charged.
Symptom is that the rear of the bus is very cold, while the dash air temp supplied not by the Prevost “Over-the Road” system, does not get as cold. THANK YOU, Jeff
P. S. – the front expansion valve was replaced about 6 months ago
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7 Replies
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In a perfect world? the ball will be floating in the center of the site glass. Its like the oil level in the compressor, in a perfect world? the level will be in the center of the site glass.
Could be a leaky solenoid valve for the dash heat curcit allowing hot coolant to the dash mixing chamber, thus warming your dash AC air. So, you can shut off the dash heater water supply back at the engine somewhere?
Also, block the dash outside air source, that way it will recirculate interior air, and not draw in hot outside air. Again, I don’t know where that’s at on your H3. On an old XL it’s just above the frt bumper, and on a Liberty XL its above the shutters/luevers. -
Here’s the Carrier 05G Operation and Service Manual: LINK
The main indicator of the condition of the OTR system tuneup, is the temperature of the air coming out the vents.
What’s the temp of the main cabin vent air? What’s the temp of the dash vent air?
If the filter/dryer downstream of the accumulator is getting restrictive(blocked), liquid will backup/overfill the accumulator. -
Where does one get the fitting that would fit on the upper valve to charge the system? A regular automotive gauge set does not work
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Had my OTR service at the Winter Park Prevost. Was told to check the oil level in the sight glass only after 1/2 hour of operation for accurate level
Chuck
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Ralf, Since about 95 our buses and daily drivers use R134a freon and large R134a quik release fittings. Nothing unusual about our bus fittings. You can get the gauges and hoses anywhere.
When I remove the R134a quik release fitting from my hoses, I can then use the hoses to charge my R22 freon CruiseAirs or R12 ac systems. -
Thank you sir, dumb me I thought the system was serviced in the condenser bay where the sight glass was
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It can be if you pull a vacuum on the system you can add liquid refrigerant at the receiver tank.
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