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Old 05-13-2014, 10:07 AM   #1
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Recharging cab AC unit

OK, maybe I should not have done this… based on the forum comments. Last year our MH cab AC was blowing air at 75 degrees, or maybe even warmer. Summer is here and it is doing that again. We are using it this week so I wanted cooler air than that. I bought a can of 134a leak sealer. I had the reusable dispenser from last time. I found the low side (a blue cap just like the dispenser connection) and connected the dispenser. I was careful not to turn the can upside down but did shake it… same as last time. The gauge on the dispenser measured about 10 psi or less before starting. I had already started putting in refrigerant/sealer before thinking to check this. I put the entire can in and the psi came up to about 20+ psi when the compressor was not running ( I am guessing on this) and would move up to about 37 psi when on. This cycle occurred maybe every 15 seconds… I did not time it. Anyway, the AC is now blowing air at about 68 degrees.

The gauge on the dispenser has an arrow to point to the outside temperature and then a range that the psi should be in when charged. I barely got it to the minimum psi when the can was empty. My question is if it needs another can of regular 134? I am assuming a leak and this might or might not fix it but we are leaving tomorrow and I do not have time to take it somewhere.
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Old 05-13-2014, 02:42 PM   #2
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I put 2 cans of 134 into my '03 Dodge pick-up. And, I put 1 can into my '07 Damon (Workhorse W24). They work GREAT now. Just be careful to not over pressurize the system.

I think this stuff just leaks out of the pores of the system over time more than the old stuff...you might not have an actual leak.

As a side note: The instructions on my charging kit said to put the AirCon on MAX with the blower on high, so it doesn't stop running the compressor during the fill.

Safe travels
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Old 05-13-2014, 04:16 PM   #3
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The only safe and accurate way to recharge an A/C system is to hook up a set of manifold gauges that reads high and low pressures. The single gauge fill from a can system is a sure way to overcharge the system, reduce efficiency or blow a hose or seal.
Many poorly performing A/C systems are a result of the heater not being shut off completely. Check by feeling both heater hoses where they enter the plenum or heater core. If coolant is not flowing through them, they should be cool to the touch. Many install a simple ball valve in the heater hose to shut off in summer.
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