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2002 Chrysler Not Cooling

ronaldbanks on Fri August 08, 2014 8:19 PM User is offline

Year: 2002
Make: Chrysler
Model: Town & Country Limited
Engine Size: 3.8
Refrigerant Type: 134
Ambient Temp: 92
Pressure Low: 240
Pressure High: 15
Country of Origin: United States

Mystery problem I purchased this Mini Van about 7 months ago with about 150k in it, garage kept in good condition but it needed a new compressor which I bought. Everything was good. AC worked fine. Recently My AC stopped working. Found the front evaporator had blown and the previous owner had put 134a in the system with that green oil in it. My mechanic changed the front evaporator and got all the oil out of the system. This vehicle has dual zone ac. My mechanic could not get the ac working, he has about 30 yrs. experience. He then thought it might be the expansion valves. He replaced both front and rear 2x. When changing rear he accidentally broke rear evaporator. We had to replace it. High side 240 Low side 15 accelerate and suction side drops shut off car and both side equalizes. Could we have a collapsing hose? High pressure side icing up, both front and rear low side hot. Thanks for any thoughts.

webbch on Fri August 08, 2014 11:25 PM User is offlineView users profile

This sounds like the classic case of failure to flush a system after the compressor barfs it's guts out into the lines. I rather suspect you're just dealing with the aftermath of that original compressor. Until you get the A/C system back to a known clean state, I think you'll be chasing your tail. Not what you want to hear, but a full system flush is in order, new condenser, TXV's, and flush out all the lines, and new orings. This is work that should have been performed back when the compressor was replaced.

In one statement, you say that your mechanic "got all the oil out of the system". Yet it appears that AFTER this he "accidentally broke the rear evaporator". In order to get all the oil out of the system, you must disconnect all the lines, TXV's, evap, compressor and flush everything out clean. That's the ONLY way to get all the oil out. This would clearly require disconnection of the rear evaporator at the earlier time. I suppose it's possible he broke the evap on the second time he worked on it, but normally you break them while making that first disconnection when it's corroded in place.

BTW, nothing wrong with dye (what you're calling the "green oil"?). The really bad stuff is any of those cans of refrigerant containing leak sealer.

mk378 on Fri August 08, 2014 11:41 PM User is offline

If you have ice on what should be part of the high side, there is a blockage just before where the ice forms. The abnormal pressure drop causes the refrigerant to evaporate in the line. Nothing should get cold before the TXV.

Like webbch said, likely the condenser is blocked with bits of the original compressor. And the 'green oil' is just UV dye which is an approved additive (often added at the factory) to help find leaks.

ronaldbanks on Sat August 09, 2014 12:23 AM User is offline

Awesome guys thank you, He accidentally broke the rear evaporator the second time because the bolts in the expansion valve were frozen and he had to drill the bolts out. I will get your info to him on Monday. Would be nice to have air again.

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