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Belchlw
Novice

Aug 13, 2012, 4:38 PM

Post #1 of 13 (2921 views)
A/C Repair Sign In

2002 Lexus SC430 A/C blowing hot air- car has 68,000 miles, dealer says compressor piston worn out. Does that sound reasonable?


(This post was edited by Belchlw on Aug 13, 2012, 5:18 PM)


Discretesignals
Ultimate Carjunky / Moderator
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Aug 13, 2012, 4:48 PM

Post #2 of 13 (2915 views)
Re: A/C Repair Sign In

Could be, but there isn't enough information that you provided to conclude it would be something like that. There are a lot of things that can cause poor ac cooling.





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Hammer Time
Ultimate Carjunky / Moderator
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Aug 13, 2012, 5:02 PM

Post #3 of 13 (2897 views)
Re: A/C Repair Sign In

I moved this to the AC forum

Pretty much anything that goes wrong with an AC system, the result is warm air so unless you have the specifics that led them to that conclusion we can't tell you much.

PS: What is an SC439 anyway. That's not a Lexus i ever heard of.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Aug 13, 2012, 5:03 PM)


Discretesignals
Ultimate Carjunky / Moderator
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Aug 13, 2012, 5:20 PM

Post #4 of 13 (2878 views)
Re: A/C Repair Sign In

Maybe SC430?

I haven't had the honor of working on something like that. The highest I got so far is LS400.





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(This post was edited by Discretesignals on Aug 13, 2012, 5:23 PM)


Belchlw
Novice

Aug 13, 2012, 5:22 PM

Post #5 of 13 (2874 views)
Re: A/C Repair Sign In

Typo - it is an SC430


Belchlw
Novice

Aug 13, 2012, 5:24 PM

Post #6 of 13 (2866 views)
Re: A/C Repair Sign In

What is it that you need to know about the diagnostics of the a/c?


Discretesignals
Ultimate Carjunky / Moderator
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Aug 13, 2012, 5:26 PM

Post #7 of 13 (2861 views)
Re: A/C Repair Sign In

Mainly system pressures (low and high), outlet discharge temperatures, and ambient temperature/humidity when it was tested.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Hammer Time
Ultimate Carjunky / Moderator
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Aug 13, 2012, 5:28 PM

Post #8 of 13 (2859 views)
Re: A/C Repair Sign In

About everything..........
High and low pressure readings at idle and 2000RPM
pipe temps on suction and liquid lines.
Exact weight of charge
how much air flow across the condenser
and those things may raise other questions.

You just can't go online and say "my AC doesn't work" and expect us to know why.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Belchlw
Novice

Aug 13, 2012, 5:50 PM

Post #9 of 13 (2847 views)
Re: A/C Repair Sign In

I did not look at the report but am having a hard time believing this compressor has worn out at 68K miles.


Hammer Time
Ultimate Carjunky / Moderator
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Aug 13, 2012, 5:54 PM

Post #10 of 13 (2841 views)
Re: A/C Repair Sign In

You can ruin a compressor in 1,000 miles under the right circumstances. That would be the other part of the question is, what took out the compressor. They need to also find the cause of the failure.

If you have doubts, then go get a second opinion.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
Ultimate Carjunky / Moderator
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Aug 13, 2012, 5:54 PM

Post #11 of 13 (2832 views)
Re: A/C Repair Sign In

Normally they don't unless there is a problem with the system that is causing the compressor to overheat or they become damaged from lack of lubrication. Don't know the particulars of that compressor, but it might be one of those variable displacement compressors in which system pressures determine its displacement.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Belchlw
Novice

Aug 14, 2012, 11:01 AM

Post #12 of 13 (2801 views)
Re: A/C Repair Sign In

At idle, low side 120 and high side 250, at 2K rpm, low side 90 and high side 250. Suction and liquid lines at underhood temps, outlet temps at ambient which was 80-85 in the shop. Both cooling fans were working and condenser was sprayed with water with no difference noted on pressures


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 14, 2012, 11:51 AM

Post #13 of 13 (2794 views)
Re: A/C Repair Sign In

Yep, sounds like the compressor is wasted. You should be changing the compressor, condenser, dryer and possibly the expansion valve too if any debris made it that far



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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