Model: Wrangler YJ
Engine Size: 4.0
Refrigerant Type: 134
Ambient Temp: 100+
Pressure Low: -
Pressure High: +150
Country of Origin: United States
I recently purchased a used AMA system. The system was working perfectly in the sellers vehicle when I bought it. I installed the system about two weeks after purchasing it. I pulled vacuum and everything looked good, no leaks? Then I started charging the system. I first tried filling the system with 24oz per the manufacturer. The system was not cooling and the pressures were not high enough. I then added one more can, total of 32oz, and little if anything changed. The low side was in the negative and the high side was +150, maybe much higher, don't remember exactly. I shut everything down and the pressures leveled out over time.
I double checked the install of everything and it all looks good. Blower works, clutch works. Any ideas? Like I said, everything worked perfectly before it was removed from the sellers vehicle.
System uses 24 ounces of refrigerant. Adding more is just making what ever issue you have worse. Are you pulling a vacuum before charging? Do you have capillary tube attach to the suction line on the evap and wrapped with insulation tape?
Yes, I pulled vacuum before charging. I have that coiled line from what looks like a t-stat the attached to the larger hose fitting and wrapped in insulating tape. Is that what you are talking about?
Get the charge level back to 24 ounces and repost the low and high side readings.
Low side is in the negative. High side is about 170. From what I'm hearing, it is most likely the expansion valve. Sound right to you? Can these go bad just by sitting for a couple of weeks in the AZ heat?
Not normally, but if you're pulling into a vacuum, you have a restriction somewhere in the loop.
Did you use a new receiver-drier? Do you have the receiver drier hooked up in the proper flow direction?
If there's a restriction somewhere else on the high side, the part just downstream of the restriction will get abnormally cold. All the high side lines should be somewhat warm all the way up to the TXV.
The TXV sensor bulb must be attached to the OUTLET of the evaporator, the line leading to the compressor. Not the line leaving the valve and going into the evaporator. After ruling everything else out, it could very well be a bad valve, they are a precision part with a small passage.
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