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Anyone ever used AC Avalanche on dash air?
What specifically do the two AC compressors do in our CC? The larger one is on the 90 degree box that drives the fan and I believe delivers refrigerant to the CC version of OTA. The other is a smaller unit located on the right side of the engine and belt driven by the same belts that drive the 24vdc alternator located there. Is that smaller one only for the dash AC? Is it the one that is controlled by the rotary knobs on the dash or do those rotary knobs control the larger AC compressor on the drivers side?
My dash AC has slowly lost charge over the time we have owned the coach requiring turning the temp knob on the dash down a bit more on each trip. Finally, this last trip it no longer would blow cold air even with the temp knob turned all the way down. If the system has no mechanical issues and just needs adding some 134a I am wondering if products like the AC Avalanche I see for sale at our local NAPA and at Amazon would work. I have no experience with it, hence my questions. And, I am confused as to which compressor needs more 134a.
Thanks for your help.
Jerry
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5 Replies
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The opposite is correct. The A/C compressor connected to the fan is the Prevost installed dash A/C compressor. The smaller compressor to the right is the one that feeds A/C to the galley and bedroom areas.
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Thanks. Another cup of coffee and some thinking time and I finally got myself unconfused. Left over the 90 degree box is the Prevost AC compressor which services the dash air and the physically smaller one on the right services the automatic CC OTR units in the bathroom and salon. Now I need to figure out what those two have in common in the electrical relm as the clutches in both seem not to work right now and the lights below the automatic unit switches on the dash do not illuminate when the buttons are pushed.
Jerry
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If the refrigerant pressure is too low, the clutches won’t engage. That is done to protect the compressor. No refrigerant means no oil circulating.
The AC Avalanche product looks like a can of refrigerant with some kind of stop-leak in it. Personally, I avoid using stop leak in anything because I don’t want some foreign substance contaminating A/C, coolant, engine oil, etc. Inspect the A/C components, especially at every fitting, looking for an oily residue. If you have had a leak for some time, there should be oil around the leak. You can confirm a leak with soapy water (heavy on the soap) or Nu Blue solution if there is still pressure in the system. Sometimes it’s just tightening a fitting, but sometimes the system needs to be recovered, repaired, evacuated, and recharged. If you just want to add some refrigerant to get you by on a trip, try to find some pure refrigerant without stop-leak.
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Thanks. I also found an electrical issue. The Memory fuse and supply on the black electrical panel between the two inverter/chargers was bad. I will have time today to explore further, but the Owner’s Manual implies 12vdc on that line is necessary for the functioning of boards 16 and 17 and they control at least the OTA air conditioning system functioning. Maybe also effect the dash air?
Jerry
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Drivers air is a Prevost system. It should not be affected by the inverters which were added by the converter.
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