Hey all. My 1991 379s a/c lost its chill. I checked the freon and it was at 35, so I added a little. The a/c clutch spins like normal. My mechanic tested the system with the valves and explained to me that it wasnt balancing like it should. He said theres a blockage. He wants to replace all expansion valves, dryer, pag oil, and flush the system. Its not that I dont trust him or his word, but that seems like overkill. I found online that the txv valve could be the culprit. So I was thinking of starting there. Any advice or ideas please. Thank you.
379 A/C blowing cool, sometimes briefly cold
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Coolbreezin, Jun 3, 2020.
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The expansion valve usually gets clogged up and gets stuck, it's a relatively inexpensive part to purchase $40-50, the receiver/drier should be replaced anytime you open up the system, it's about $22.
Doing a service on your system should bring it back to the level it was previously.Coolbreezin Thanks this. -
What he said^^^^^^^^^ if it’s blowing cool but not cold and a little muggy it’s definitely the expansion valve in the sleeper. Your mechanics just trying to fix it right the first time!
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View attachment 333549 gauges first, gauges first, gauges first.
bigguns Thanks this. -
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On a 379 pete it could be the core inside the truck needs cleaning .
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Im contemplating running a 5000 btu window a/c unit in my cab off of my batteries. I have 4 950cca diesel batteries going to a 3500 watt inverter. All about 1.5 years old and still quite strong. I cant find any info regarding how many batteries/power I should have going to the inverter. When I did this before, the inverter would state it was too low on voltage and would turn itself off. So I was wondering if I added two batteries and tied them all together would be of any benefit. Any advice is appreciated.
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