92 Ls 400- A/c System

[Grandpa]

NVM, i noticed that my dad has GREEN coolant for his Nissan Sentra... is that bad for his car? lol

[monarch]

You AC system will break down within a few years if you let people

talk you into a cheap priced ($30-$150) R12 to R134a conversion / retrofit.

The Toyota Technician Training Manual on Air Conditioning Systems,

Course 750 Update lists several reasons why converting / retrofitting

R12 systems to R134a is a major, expensive undertaking (if done properly).

Here are some quotes from the Manual:

"R134a attacks the nitrile butyl rubber found in R12 system hoses."

"R134a requires special carbon-filled iso-butyl rubber parts."

"The conventional silical gel dessicant used for R12 may break down

when exposed to R134a. R134a requires a molecular sieve type dessicant."

"R12 systems use a highly refined mineral oil lubricant. R134a systems

use synthetic "PAG" lubricant which can cause swelling or foaming of

conventional rubber gaskets and seals used in R12 systems. Be sure to

special RBR rubber O-rings during assembly and repairs."

"R134a hoses not only have the special RRB rubber, but also have an

impermeable inner lining of nylon to reduce seepage of the refrigerant

and to prevent moisture entry into the system."

Now even if you spend all the time and money for these special hoses,

O-rings, dessicant, etc., you still won't get the cold 37-42 degree F

air coming out of your AC vents like you did with R12. You'll get more like 45-55 degree F air, which means the interior of your car will be about 10 degrees warmer on a hot day if you convert to R134a.

[vyhanh]

Follow this thread for red/green coolant?

http://us.lexusownersclub.com/forums/index...&hl=red+coolant

[VMF]

i dont know bout sentra but ls400 needs red non ethylene glycol based coolant for ur engine (its not a refrigerant for ur AC system), you should search the forum about the flushing procedure for engine cooling system

[chips229]

Sorry to hi jack the post,i need to take the radiator condenser out of my car and replace it as its leaking as ive lost all me air con gas...ive had a quick look

looks like the engine cooling radiator needs to come out first to get to the condenser radiator.

Then it looks like it can be removed from the engine side of the front of the car..

Is this how its removed?

cheers chips

[Grandpa]

Can any1 tell me where the oil filter is located on the ls 400?? i cant find it at all lol

[vyhanh]

Helpful links:

http://www.cureline.net/lex/howtos.htm

http://www.lexls.com/tutorials.html

[LEXIE]

gp--

i dont want to sound disrespectful here but you started out with an a/c

problem, then we moved to an engine coolant situation and now we

are on oil filter location.

there is nothing wrong with the diy approach but it would seem prudent

to solve one problem at a time then go to the next to keep confusion

to a minimum. you surely dont want to overload here in one week

since i see you have been a member for nearly a year.

nontheless, it is nice you have taken an interest to do these things on your own.

L

[Grandpa]

Im a very quick learner... as a matter of fact, i have drained, flushed, and refilled my coolant w/ preston coolant (red) :). I am actually learning stuff... i can tell where things go and such, I kno a lot more about the electrial too... the A/C, will get retrofitted by a mechanic who knows what he is doing.. and for the radiator, i have accomplished that task :) now, its onto the next 1!!

[VMF]

thats good to know man, but for the oil change you better search in the forum and if you will not be able to find anything for u start a new topic about oil change since this one was about the AC originally.