I just wanna kno how many people have replaced there Expansion Valve? my A/C does not blow cold air at all, 1999 gs400

I got some input from sakataj(thanks), just wanna kno if anyone else had this problem.

A/C off : 93psi high side 93psi low side

a/c compressor on : 95 psi high side 80psi low side


clutch is cycling on. Fans cycling.

 

Before getting into complicated replacement which means evacuation, etc. why not check for leaks first. Then try 1 can and see what happens.

 

There are no Leaks. The compressor holds Freon, its just not circulating

 

Your high side readings are low and your low side readings are high, you got a bad compressor. A bad or clogged expansion valve, would show vacum on the low side readings on the a/c gauges. When you replace the a/c compressor, be sure to change the a/c reciever/drier bag located in the condensor.

 

Yea, i guess im gonna replace my compressor

 

um, no leaks. it has 93 psi in it....def not leaking

your on the right track but not quite there. yes his readings are low on the the high side (depending on the rpms) and a little high on the low but its STILL not 100% a compressor. if its stopped up yes the expansion valve would show vacuum but if its just bad and still allowing freon to flow through it then the pressure will "read" weird i guess it best way to word it. i mean we do use a electric expansion valve dont we? (i dont think i honestly have EVER looked lol and i am a heating and air guy) so all it does it regulate the expansion valve open/closed depending on the temperature.

lol, rebuild or replace?

also when the refill your a/c lines ask them bout a freon called Hotshot or r414b. i have used this in my car for bout 6 years or longer. i can get ac down into low 30's easily.

 

I'm having the same issue with my ES. I went to my mechanic today and the A/C blows Cool but not cold.. He said expansion valve but i wont know until tomorrow.. I'm leaving it till Thursday.. I also need a Compressor cause that thing is so loud the clutches are probably going..

 

Im gonna do it at Toyota, and its a actually a used unit,
new one was $1200

And i will ask about the freon,

 

SO i replaced my compressor, didnt work at first we used autozone r134a didnt cool. so i was gonna do my expansion valve, so i needed to vacume the system, my boy works at honda he hooked it up to the mechine took everything out, and i guess it cleans it too, and i was gonna leave, and he was like u wanna try to fill it up with mechine, im like i guess wouldnt hurt, well now it cools, but only get to about 60-62 and the lowside pipe does get cool. but its not cooling as it should! and thanks sakataj for all your help.

 

your welcome man. least we are starting to get somewhere...you have the new readings on the high and low side now that your getting some cooling? does it get colder as you move or as air circulates over the condenser?

 

this may be a dumb question, but is it possible for freon to leak from the condensor? Is the condensor where the drier gets replaced? I'm trying to get an idea of it all as I have a compressor, drier kit (not sure what the diff is between kit and just the drier), and expansion valve. My compressor is seized (where you can normally grab it and rotate it), and it sounded like the freon was audibly leaking from the compressor area...just making sure I don't need a condensor as well.


Edit: also just thought of this....what problems would cause the compressor to seize? I still haven't figured that out...maybe I can savemyself some cash if I figure out why the compressor just won't turn...is it because there's no freon at all and that's what's required to keep it lubed?

 

bump for anyone who has some insight....

 

Bump, I know this is old, I havent fixed my GS since its just been sitting for years. But I believe the video below will help anyone. I will be doing it once I start driving my GS again. That is not me in the video.

 

You have a bad compressor. From the readings you have internal failure. Note when replacing the compressor you should replace the receiver dryer also.