Diagnosing bad AC compressor

[Hodgdon Extreme]

I'm not an AC guru, but I think I've diagnosed my AC compressor as bad. Would like other's thoughts:

2002 Lexus IS300, 140k miles, owned it a couple years, AC always worked great

This spring, I noted warm air coming out the vents. AC clutch is definitely engaging and compressor is turning, but no strange sounds at all. Hooked up the gages and I have 100psi on the low side, and 100-105 on the high side - that is while compressor is engaged and turning. AC clutch does not cycle on and off. As soon as you call for AC, it engages and stays engaged. No noticeable change in engine load when this happens.

Tried to put a little refrigerant in it anyway (cause that's what you do when your AC doesn't work, right???) and obviously, the low side pressure was higher than the can of refrigerant - so no flow into the system.

Also, during operation with the gages hooked up, I had no flow through the sight glass.

Seems obvious to me the compressor isn't doing jack shit - but I'd love for someone more experienced than me to confirm/deny my findings!

If it needs replacement, I'll be changing the compressor, condenser, expansion valve and drier - because my understanding is that's the "right" way to do it if/when a compressor fails.

Thanks in advance.

[Bateman]

I’ve never had one not Lock up when they go bad, but obviously that’s not always the case.

I’ve got away with not replacing the txv when it’s a dash out ordeal. Mainly just came in here to say that I used BuyACParts.com. Believe it was like a year or two warranty, but anyways all of it was about $200. Compressor, condenser, oil, orings, everything. Still blowing cold 2+ years later.

[vehicular]

The fact that it's throwing the magnet on the clutch, but not compressing refrigerant says the clutch isn't actually functioning to me.

Either way, most modern compressors aren't serviceable so you're probably going to have to replace the whole assembly simply because you can't get a clutch.

[BloodFart]

Not to hijack, but also having Lexus ac issues. 05 LS430, 150k miles, AC blows warm when car is 1st started. After restarting, blows cold rest of the day. Only does this during the hot summer months, during spring and fall AC works normally. According to the gauge on the ac can (I know) refrigerant level is good. Is this also a compressor issue, or pressure switch, or who knows w/out gauges. What shop would you guys use? DK Auto, or ?? Gracias

[Hodgdon Extreme]

Is it engaging the compressor on that first call for AC?

[Wilson!]

System may be full of air. Need to evacuate the system, pull a vacuum and properly charge it and go from there.

[Hodgdon Extreme]

System may be full of air. Need to evacuate the system, pull a vacuum and properly charge it and go from there.

Are you referring to my issue?

If so, how could my system go from full of good refrigerant to fill of pressurized air?

[Wilson!]

It happens. Seen it many many times. I’m not saying you don’t have an issue, but the only way to properly diag it is to evac/recharge and see what what it does with a known good charge.

[Hodgdon Extreme]

I don't see how I could have anything other than a known good charge, already.

It worked great. It hasn't leaked.

What am I missing?

[Hodgdon Extreme]

Anybody know where I can get a refrigerant recovery tank emptied?

[OMGWTFBODY]

Back yard.

[Hodgdon Extreme]

Back yard.

I'm no tree hugging hippie, but that is just wrong and irresponsible.

RE Michael will take a full one and give you back an empty one - but you must have an HVAC license...

Can't understand why the powers that be would want to add a roadblock to the responsible recovery/recycling of refrigerant. I can *sort of* understand the roadblock to buying the refrigerant - but surely not the return.

So - anybody here have an HVAC license that's willing to perform the tank swap-out for me?

[lerodmanj]

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