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Belchlw
Novice
Aug 13, 2012, 4:38 PM
Post #1 of 13
(3070 views)
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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)
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 13, 2012, 4:48 PM
Post #2 of 13
(3064 views)
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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.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 13, 2012, 5:02 PM
Post #3 of 13
(3046 views)
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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)
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 13, 2012, 5:20 PM
Post #4 of 13
(3027 views)
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Maybe SC430?
I haven't had the honor of working on something like that. The highest I got so far is LS400.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 13, 2012, 5:23 PM)
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Belchlw
Novice
Aug 13, 2012, 5:22 PM
Post #5 of 13
(3023 views)
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Typo - it is an SC430
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Belchlw
Novice
Aug 13, 2012, 5:24 PM
Post #6 of 13
(3015 views)
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What is it that you need to know about the diagnostics of the a/c?
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 13, 2012, 5:26 PM
Post #7 of 13
(3010 views)
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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.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 13, 2012, 5:28 PM
Post #8 of 13
(3008 views)
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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.
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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.
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Belchlw
Novice
Aug 13, 2012, 5:50 PM
Post #9 of 13
(2996 views)
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I did not look at the report but am having a hard time believing this compressor has worn out at 68K miles.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 13, 2012, 5:54 PM
Post #10 of 13
(2990 views)
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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.
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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.
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 13, 2012, 5:54 PM
Post #11 of 13
(2981 views)
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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.
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Belchlw
Novice
Aug 14, 2012, 11:01 AM
Post #12 of 13
(2950 views)
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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
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 14, 2012, 11:51 AM
Post #13 of 13
(2943 views)
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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
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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.
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