89 240sx AC problems

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BrianZ32
Posts: 85
Joined: Tue Sep 13, 2016 1:55 am
Car: 93' 9 2+2 300zx

89 240sx AC problems

Postby BrianZ32 » Sun Aug 26, 2018 9:55 pm

I made a mistake and now my AC doesnt work.

When i bought the car, the prev owner told me the AC needed a recharge but never told me if it was R12 or R134. Once i found out it was R134 but with the old fitting. I filled it, but i believe there is a leak somewhere. I checked the level a couple weeks later and it needed to be topped off. To fill it, i needed an adapter, so i when i topped it off the 2nd time, my dumb*ss left the adapter on and its leaked out. And now my AC doesnt turn on, nor does the green light on my climate control. I heard it is some sort of safety switch. Since then, i have added some, but it is difficult to get an accurate reading as the AC needs to be on to properly fill it up. Any recommendations? I have not checked any fuses yet because i wasnt too sure where to go about it.


MikeRL411
Posts: 223
Joined: Sat Nov 29, 2014 7:46 pm
Car: 1997J30T, 1967RL411

Re: 89 240sx AC problems

Postby MikeRL411 » Sun Aug 26, 2018 10:44 pm

THe 89 and 90 use the oldeR and now Aobusly epensive R12 FREON, not he current R134 1 SO, YOU HAVE RELOADED THEWRONG REFIRIERANT 14!

BrianZ32
Posts: 85
Joined: Tue Sep 13, 2016 1:55 am
Car: 93' 9 2+2 300zx

Re: 89 240sx AC problems

Postby BrianZ32 » Sun Aug 26, 2018 11:32 pm

MikeRL411 wrote:
Sun Aug 26, 2018 10:44 pm
THe 89 and 90 use the oldeR and now Aobusly epensive R12 FREON, not he current R134 1 SO, YOU HAVE RELOADED THEWRONG REFIRIERANT 14!
Sorry, i failed to mention that it was convert to R134a but the R12 fitting was still there

amc49
Posts: 1066
Joined: Mon Jun 19, 2017 7:24 pm
Car: '11 Versa
'17 Altima

Re: 89 240sx AC problems

Postby amc49 » Mon Aug 27, 2018 3:51 pm

Did the oil type change too? I ask because the usual mineral oil used with R12 is incompatible with R134.

The compressor will stay off until you get past the pressure in the system that re-enables it to come on, usually around 25 psi or so. You just charge with system not working until it comes on. Of course, if it leaks faster than you can put it in the system will never come on.

User avatar
harukisan
Posts: 45
Joined: Fri May 31, 2013 12:40 pm
Car: 1989 Nissan 240sx coupe right hand drive, sr20det and 1989 JDM Silvia Ks model w/CA18DET

Re: 89 240sx AC problems

Postby harukisan » Sun May 05, 2019 6:40 am

I know this is an old topic but I thought I would throw in my 2 cents.
I have a JDM 1989 K model Silvia that i use to have an AC problem with. The car is mostly stock with the CA18det motor.
My AC was weak so I tried converting to r134a. That didn't really help so I narrowed down my real problem was with the cold air door accuator. I had to get a guy in Australia to get me a new one from Japan ( I tried the USDM part and it was wrong because my car is right hand drive).
Anyway I already had the pump rebuilt, so I took my whole AC system apart except for the part inside the cabin and I flushed all hoses condensers etc. and drained the pump and put in the proper amount of mineral oil. i put the vacuum on the system and pulled the proper setting. I also replace the dryer and all the schrader valves that the freon goes in & out. I then put in fresh r12 and now it all works like brand new.
I only post this because I want to help those people out there that like to have a car and all the components work the way they should. Save yourself a lot of grief and heartache and just rebuild the system, you will be glad you did when its cold or hot outside.


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