dbullen

iTrader: (3)

The end of last summer my A/C compressor seized. Just before it seized the a/c was still blowing cold. I just purchased a new a/c compressor w/cluth and dryer. Wonder if there is anything else I need. I here there is two types of a/c systems and some type of conversion kit that you can get. Does anyone have any info on this?

Bradster

I guess you're talking about switching from R-12 (which you have in a 92) to R-134 which started in 93 or 94.I just replaced the evaporator,expansion tube assembly and the drier/receiver in my 90 LS400.The shop gave me the choice (since i had the needed parts) to either stay with R-12 or convert to R-134 for the same price.I chose to convert.I'm not sure about your conversion because i was told new o-rings have to be installed to handle the higher pressure of 134 and you are not replacing certain parts that have these rings.I may be a little off base here so maybe others can set you straight.Seems to me that if you are replacing only the compressor that you should probably stay with R-12,but hey what do i know

dbullen

iTrader: (3)

Does anyone know if I stick with R 12 and just replace the compressor / dryer will I need to have the freon filled? Also does the R-12 and R134 use the same dryer or are they different parts?

1994 LS400

Hello ~
I have been wondering this for a long time, Is the Air Coditioner In the 1993-1994 LS more reliable than the 1990-1992's. Since the conversion to R-134 ( like Copressor, evap, drier etc....) If anyone knows please post , thanks!
Paul

hyperopt

If the system was initially designed for R-134, then it should be reliable. The same cannot be said for R-12 to R134 conversion if not done properly.

Bradster

The stock dryer/receiver part # 88471-50010 for 90-92 LS400 can be used with R-12 or R-134.I hope he's right because i used that part when i converted to R-134 2 weeks ago.

dbullen

iTrader: (3)

Now I'm not sure whether the system is still R12 or whether the previous owner converted to R134. From what I'm told you need to check the fittings to tell whether it's R12 or R134. Does anyone know where I look for this?

Curt

I am a shade-tree mechanic, so use your own judgement.

The high pressure fitting is on the line coming out of the front of the condensor. So if you open your hood, look behind the right fog light. If your system is R12, the fitting will look like a tire valve. It will have screw threads on the outside just like a tire valve. If the system has been converted to R134a, there will probably be a smooth aluminum fitting screwed on to the valve.

The low pressure valve (which is the one you need for installing the freon) is close to the firewall, close to the right side where the AC hoses pass through the firewall. You'll need to lean over the right fender and shine a light down in there in order to see it. Again, if your system is R12, the fitting will look like a tire valve. It will have screw threads on the outside just like a tire valve. If the system has been converted to R134a, there will probably be a smooth aluminum fitting screwed on to the valve.

Curt

dbullen

iTrader: (3)

This is an old post..
A/C system was R12 I bought a new compressor and filled it with ES12A instead so I didn't have to convert my system. Still working strong when I sold the car a few days ago.

ceenu

I have 91 Lexus LS 400.

I like to convert the system to R134A , can some one please describe step by step.

I dont have R12 freon in the system.

If no R12 freon can i do the following ?

1. Change the high pressure valve and low pressure valve to R134A
2. Fill the R134A freon .

Is that right ?

If there is a leak near o-ring how to open it ?
Can someone let me know how to open it [because i felt very hard to open it]
its located near the battery [left side beside the radiotor ]

Is there a website which will tell how to do this ?

Thanks & Regards,
Srini