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Hey guys I need some more help with my a/c. I just replaced the drier, orifice tube, and cycle switch. I also had the system evac'ed and recharged. My cooling fan is working. But after about 5 minutes of the a/c running it will make a loud noise and pressure will release from the high side line right where the orifice tube is. I turn off the ac right away to keep something from blowing but obviously it is building too much pressure for some reason. What else could be causing thing? Could a bad compressor do this? I am not sure what else to look at. The clutch seems to be kicking in just fine and working fine, there are no strange noises coming from the compressor other than the click when the clutch engages.. My a/c seems to be cool but not ICE cold like I need it to be.
 

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1998 ZX2
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The orifice tube could be clogging or there could be too much oil in the system.
 

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1998 ZX2
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9,978 Posts
I would bring it back. Something isn't right.
 

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Are you sure the seal at the line right there isn't just leaking?

IIRC you were converting this to R134a as well.. keep in mind you only need to put in about 70-75% of the amount it calls for in R12...

Example.. if specs say it holds 2 lbs of R12, then after retrofitting the system you should only have to put in 1.5 lbs of R134a.

It may simply be overcharged...
 

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If you are doing a conversion, start at about 50% of old r12 charge. Then slowly work up to final charge watching the pressures (both high and low) as well as output temp. As soon as the low side line condensates up (easier to notice on a humid day), then you are close, if not right on.

One thing the Mazda proteges have on the escorts (comparing BG to BG) at least on my 93, it had a sight glass. As soon as that ran clear, and the low side line sweated up all the way from the compressor to the dryer...you were good to go.

If you are going to gauge it, google R134 pressure chart, as the humidity and temp will affect the readings you are seeing. Some folks lean on the gauges too much, without knowing what they are looking at. If you are filling on a 50 deg day, your readings will be much different than if its 100.
 
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