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Lexus LS 400/LS 430

8329 messages,  Last post on Nov 03, 2009 at 8:48 PM

You are in the Lexus LS 400/LS 430 Forum. Your Hosts are pat & karens

What is this discussion about? Lexus LS 400, Lexus LS 430, Sedan


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#8216 of 8329
Re: Troubled Air Conditioner [mheni1] by wwest
Jul 06, 2008 (1:28 pm)
Reply

Replying to: mheni1 (Jul 05, 2008 3:15 am)

It sounds as if the evaporator may have gotten too cold and froze up.
 
Did you still have good/strong airflow from the system during the early part of that hour or so...??
 
If not then the airflow was being blocked by the iced over evaporator.
 
There is a thermistor mounted right against the downstream side of the evaporator so the ECU will/should never drive the evaporator temperature below freezing. But, believe me, it does still happen.
 
The HVAC firmware, as a remedial/recovery measure, may prevent the use of the recirculate mode or the floor/footwell airflow modes until the next time teh ignition is switched on.
 
I have only had the LS400 A/C shut down in the manner you describe, once in our 92 LS400 while traveling west out of Helena MT, and then in my brother's 92 LS400 traveling north into OR from the mountainous regions of northern CA.
 
While I suspected evaporator freeze up in both instances I did not think to check for airflow on either occasion. So the A/C shutdown may have been the result of the extra climbing load on the engine and therefore coolant "threatening" to overheat.
#8217 of 8329
Re: Troubled Air Conditioner [wwest] by rennybosch
Jul 07, 2008 (11:56 am)
Reply

Replying to: wwest (Jul 06, 2008 1:28 pm)

Willard, you are amazing. You know more about these cars than any "professional" at the dealership. And especially for an electronics guy -- truly amazing.
 
Thanks for your contributions.
 
Renny
#8218 of 8329
Engine skip by bpolice
Jul 11, 2008 (11:07 am)
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I have a 1991 LS400 with 209k on it. I have a slight engine skip when speed is held steady between 40 and 50mph. No skip at any other speed. I used fuel injector cleaners, use only premium gas and really follow all maintenance schedules. Any advice, suggestions?
#8219 of 8329
Re: GPS DVD [nvbanker] by mheni1
Jul 24, 2008 (3:01 am)
Reply

Replying to: nvbanker (Jul 01, 2008 7:25 am)

Thanks for input. My Lexus dealer was unable to replicate the problem but as a "courtesy" replaced practically all a/c parts and I have had no problem since the repair work. I think this probably demonstrates one of the values of dealing with the same people over a long period of time--8 years.
My thanks also to those that run this "chat".
#8220 of 8329
Chrome wheels are peeling by marflyers
Aug 05, 2008 (4:07 am)
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I recently purchased an '06 LS430 and while washing it this weekend noticed that 2 of the wheels are peeling. Has anyone else experienced this and what can I do to restore the finish?
#8221 of 8329
Warranty running out by mheni1
Aug 23, 2008 (3:09 am)
Reply
I have a 2001 LS430 with 79k miles. I purchased 7yr/100k warranty. Warranty runs out mid Nov and I want to make sure that all items that need repair under warranty are identified and corrected.
I'm not mechanically inclined. Am going to take car to local Lexus dealer and ask him to check out thoroughly.
Will appreciate your thoughts on items/concerns to pay particular attention to during this Lexus checkout. Thanks so much for your input.
#8222 of 8329
Re: Warranty running out [mheni1] by nvbanker
Aug 24, 2008 (3:25 pm)
Reply

Replying to: mheni1 (Aug 23, 2008 3:09 am)

Be prepared for the timing belt change required at 90,000 miles - that'll be coming at you. Otherwise, there isn't anything special you need to do to this car besides routine maintenance.
#8223 of 8329
Re: Warranty running out [nvbanker] by wwest
Aug 25, 2008 (8:07 am)
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Replying to: nvbanker (Aug 24, 2008 3:25 pm)

I have five 91-92(3)-95 LS400's in my realm of control/influence and ALL well over 150,000 miles and still running strong. Only one, the '95, has had the timing belt changed and that was done inadvertently.
 
And any Lexus dealer worth their salt (wanting to transfer more funds from your account to theirs) will insist on replacing the water pump (absolutely NEEDLESSLY) at the same time.
#8224 of 8329
Re: Warranty running out [wwest] by nvbanker
Aug 25, 2008 (9:07 am)
Reply

Replying to: wwest (Aug 25, 2008 8:07 am)

I believe you - but what happens to that engine when one DOES break? Isn't that an interference engine and running out of time is devastating to the valves if your timing belt jumps or breaks? Am I wrong?
#8225 of 8329
Re: Warranty running out [nvbanker] by wwest
Aug 26, 2008 (9:15 am)
Reply

Replying to: nvbanker (Aug 25, 2008 9:07 am)

When you have a sudden flat, tire blowout, there is ALWAYS the potential for loss of control and an accident TOTALING the car, or worse. But do you PREVENTIVELY install new tires, replacing perfectly serviceable ones, every XXX miles to reduce the potential...??
 
But the answer is that while I don't really think so the fact is I don't know if "my" generation of LSes has interference engine.

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