17LexusOwner

No it wasn't working at all when I left. The guys told me they changed it to 134 and recharged the system and charged me 200$. I was pretty *BLEEP*ed and will never bring it back there.

I did not know that about the sensor contacts. When the guys converted the system, i think all they did was evacuate the freon out of the pipes, put new fittings on the ports, and then fill it with the 134 freon. The pump does not turn on at all, and I haven't checked to see if it has a charge. It has been doing the same thing since the moment it came out of the shop for re-charging though so I don't think it's a leak.

I'm fairly new to this site and so forgive me if there is already a topic on this. I bought a silver '91 LS400 in March. It has 204,000 miles on it currently. I bought it with 198,000. Since it was cold here in March, I didn't use the A/C when I was test driving it. Now it's June and 90+ out and I definately need it. Only problem is when I turned it on all it did was blow hot air from outside. I brought it to a shop and had them convert the system to 134 and recharge it. All that did was make it so when I turned on the A/C the light above it would blink. I then read about the RPM sensor for the A/C sometimes got dirty, so we took 2 cans of engine cleaner and soaked the whole area where the pump is. That didn't work. My option now is to have the A/C pump replaced. I don't know for sure if that will fix my problem though, so I'm wondering if anyone could give me some insight on what the problem is I'm having. All of your help is greatly appreciated. Thanks.

Thank you very much.

Do you mean your thread SK? If not will you post a link to the thread you are talking about? I cannot find it.

I've been hearing about (and hearing) LS400's without their mufflers. I really want to do this to my own LS400 and I am wondering what steps and how much it would cost to do this. Also does the sound change if you take out the CC rather then leaving it in? Thanks.

i brought my '91 ls400 to a local shop to get the a/c fixed because it doesn't work. we thought it just needed to be changed to 134 and recharged. that didn't solve the problem. then i heard that the sensor gets dirty so we sprayed engine cleaner all over. that didn't work. we were thinking it was the compressor but i don't really wanna replace it seeing as it will probably cost a lot of money. do you guys think it's the oil and oil seals?

Thanks, I will try cleaning the rpm sensor. I hope it works.

I have been having this exact same problem with my 90' LS400. When I turn the A/C on, after a couple seconds the A/C light on the console just blinks. I saw the earlier post and checked and tested all of my relays and fuses. I also brought it into a shop and they converted the refrigerant and recharged it. The A/C still doesn't work. My dad and I know that it is something with the compressor/clutch. Any ideas on how to fix this?