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Discussion Starter #1
I figure A/C is A/C and someone here can help me out.
The system on the Subie (02' 2.5) leaked down and a mechanic put some 134 in it. Now it's making a kind of squonking sound when it's on.
I thought it was a belt. Not a belt.
Apparently it's something in the system.

I know nothing about A/C aside from basic theory and components, so I'm hoping you can help me out with this. :bloated:
 

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It could be overcharged. Did your mechanic have gauges on it when the R134 was installed? The high pressure will ruin your compressor. Have the high and low side checked.
 

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Isnt the system supposed to have oil in it too? Maybe it leaked out with the refrigerant.
 

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Suburban? Subaru? Mitsubishi?
 

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Andy,
There is too much pressure on the High-Side (Overcharge). The Honk is caused by the Expansion valve bouncing on it's seat. On a Dual Gauge, The low side should be @ 45 Psi, and the high-side @ 220-270 Psi. When it starts to "Honk", the High-side gauge will fluctuate rapidly.

Solution: replace the Expansion Valve, Evacuate, add Tracer Dye to find the leak, & recharge the system.

Hope this helps.

Pete
 

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Discussion Starter #6 (Edited)
Awesome!

Yeah, it's an Outback.

I think the guy just dumped 134 in it til he thought it had enough.
More examination showed me a leak at the junction where a hose meets the compressor. So, I guess I'll get some parts and have at it.
I'm on the right track now. Thanks again!
 
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