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S12 Technical Areas => Engine Tech => ENGINE (OEM): CA20E Tech => Topic started by: 86forever on 12:21:52 PM / 24-Jul-17

Title: Making my old a/c work again.
Post by: 86forever on 12:21:52 PM / 24-Jul-17
 So my a/c hasnt work for almost 17 years already and i finally got fed up with me driving around with no a/c.  :glaresad: So this saturday coming up 07/29/17 i going to make a attem to make it to the San Diego yearly s12 meet. With a/c and not hot air  :idea:
So i have new:
New a/c comperssor
New expansion valve which i dont know where the fuck is it at! Please help!
New a/c dryier
New orings.
New conversion a/c valve for r134.
New valve stem conversion for r134.
 So i am hoping i could have all this running by wedesday i just need help where to find the expasion valve and cant find it any where in the forums, the net or even in facebook  :opps: .
I will keep you post it and have some pics.
Title: Re: Making my old a/c work again.
Post by: S12_Lifer on 04:31:43 PM / 24-Jul-17
Your in luck 86forever.  I have an extra one.  I'll bring it to the meet.
Post Merge
Here you go:

http://www.ebay.com/itm/NISSAN-OEM-84-90-Sentra-Air-Conditioner-Expansion-Valve-9220001E00-/152594295621?fits=Year%3A1986%7CMake%3ANissan%7CModel%3A200SX%7CSubmodel%3ABase%7CEngine+-+Liter_Display%3A2.0L&epid=1022165579&hash=item2387542b45:g:3akAAOSwIjJZPtaN&vxp=mtr
Title: Re: Making my old a/c work again.
Post by: 86forever on 09:05:17 PM / 24-Jul-17
 lol no i already have one J. I just cant located where in the car is it at?
Title: Re: Making my old a/c work again.
Post by: S12_Lifer on 11:28:17 PM / 24-Jul-17
Located behind the dash, to the right of the heater core.
Title: Re: Making my old a/c work again.
Post by: 86forever on 12:27:11 PM / 25-Jul-17
Located behind the dash, to the right of the heater core.

oh man oh man thats going to hurt.
Post Merge
Well yesterday i replace the a/c dryer and all the o-rings. i perform a vacuum and leak down test and everything pass, but i think i mess up my job a/c machine my car had trap r12 somewhere in the a/c lines and recover 0.09g of it. Hopefully nothing goes wrong with our cm cars.
Title: Re: Making my old a/c work again.
Post by: weitrhino on 02:53:21 PM / 25-Jul-17
I'm in a similar boat. When it's only warm outside my AC puts out cool-ish air, but when it's hot outside like it typically is in Texas summertime the AC is useless. I don't know how to diagnose whether there's been a component failure or if the R12 has simply leaked away because the car is so flippin' old.

If there's no mechanical failure can the system simply be vacuumed and recharged with R134a buy using an adapter kit?

If you were in my situation, what's the most economical way to proceed that leads to functioning AC?
Title: Re: Making my old a/c work again.
Post by: S12_Lifer on 05:20:32 PM / 25-Jul-17
Yes, you can use R134a once you install an adapter kit.  R134a is about $32 per pound.  If you stay with the R12, you will pay around $48 per pound.  I would find an AC shop that can recover your remaining R12 and have the system checked or converted, then do the recharge.  I personally prefer to stick with R12.
Title: Re: Making my old a/c work again.
Post by: 86forever on 06:04:26 PM / 26-Jul-17
 Does anyone knows how much Oil and r12 refrigerant capacity does the s12 takes?
Title: Re: Making my old a/c work again.
Post by: Xano on 08:26:48 PM / 26-Jul-17
There should be an owners manual pdf link somewhere that would tell you pretty close.  It shouldn't matter whether you have a Mk1, 1.5 or 2.  I'll see if I can find it.

Edit: http://club-s12.org/files/FSM-1986.pdf

Edit 2: The back page shows it's between 2.0 and 2.4 lbs for non VG30E motors, and 1.8-2.2 lbs for SE's.
Title: Re: Making my old a/c work again.
Post by: weitrhino on 10:53:31 PM / 26-Jul-17
Yes, you can use R134a once you install an adapter kit.  R134a is about $32 per pound.  If you stay with the R12, you will pay around $48 per pound.  I would find an AC shop that can recover your remaining R12 and have the system checked or converted, then do the recharge.  I personally prefer to stick with R12.


I thought you couldn't get R12 since many years ago. Are you suggesting it should still be available?
Title: Re: Making my old a/c work again.
Post by: 86forever on 01:39:40 AM / 27-Jul-17
There should be an owners manual pdf link somewhere that would tell you pretty close.  It shouldn't matter whether you have a Mk1, 1.5 or 2.  I'll see if I can find it.

Edit: http://club-s12.org/files/FSM-1986.pdf

Edit 2: The back page shows it's between 2.0 and 2.4 lbs for non VG30E motors, and 1.8-2.2 lbs for SE's.

 Thank you so much the info.
Post Merge
  :yay!: :yay!: :yay!: :yay!: :yay!: So i was able to make my car blow cold air after 15 years, but i do have problems with car not idling right. I have to figure out why the a/c condenser fan does turn on "which is probably burnt" also the a/c does not turn off after it reaches very cold temperature. I think is probably the reason why my old a/c compressor took a shit on me. Maybe overheated who knows but for now i am happy that my s12 is blowing cold air.

 If any one got question just reply.
Title: Re: Making my old a/c work again.
Post by: mc on 07:31:08 AM / 27-Jul-17
..good job....what air temps are you getting it now?   I did the same to my daughters 1991 Stanza but used R152 (canned air for keyboard cleaning) and it freezes you out...dirt cheap too..drain out old oil,replace with modern oil, replace dryer, vacuum system and add 60 % or so of R152..i also converted my Camry over to it ....i just wish my SE had a/c.
Title: Re: Making my old a/c work again.
Post by: weitrhino on 11:30:43 AM / 27-Jul-17
So i was able to make my car blow cold air after 15 years, but i do have problems with car not idling right. I have to figure out why the a/c condenser fan does turn on "which is probably burnt" also the a/c does not turn off after it reaches very cold temperature. I think is probably the reason why my old a/c compressor took a shit on me. Maybe overheated who knows but for now i am happy that my s12 is blowing cold air.

 If any one got question just reply.

Are you saying the car has trouble idling when the AC is turned on? If that's the case, check that the idle up solenoid is working. It's supposed to kick up the idle speed when an extra load on the engine happens, like engaging the compressor.
Title: Re: Making my old a/c work again.
Post by: 86forever on 02:49:12 PM / 27-Jul-17
..good job....what air temps are you getting it now?   I did the same to my daughters 1991 Stanza but used R152 (canned air for keyboard cleaning) and it freezes you out...dirt cheap too..drain out old oil,replace with modern oil, replace dryer, vacuum system and add 60 % or so of R152..i also converted my Camry over to it ....i just wish my SE had a/c.
Last night it got down to 37f and this morning it was at 41f. I did the same step has you did exept r152 i used r134a.
Title: Re: Making my old a/c work again.
Post by: S12_Lifer on 11:47:23 PM / 27-Jul-17
There is a place in San Diego called Eskimo Radiator and Air Conditioning which still sells the R12.  I been taking my wifes S12 there for more than 20 years for the R12 recharge..............ice!
Title: Re: Making my old a/c work again.
Post by: ndd on 02:29:00 PM / 28-Jul-17
I am a HVAC tech.  For older automotive systems using r12 take a look at a product  called HC12-A. It can be muxed with r12 I've used on several older cars vs converting to 134a peace
Title: Re: Making my old a/c work again.
Post by: 86forever on 12:42:26 AM / 29-Jul-17
I am a HVAC tech.  For older automotive systems using r12 take a look at a product  called HC12-A. It can be muxed with r12 I've used on several older cars vs converting to 134a peace
  Hmm where can i find it and is it cheap? Plus the reason why i went to the r134a is because at work in are shop the r134 is free for employee but just don't tell are mangers lol.
Title: Re: Making my old a/c work again.
Post by: weitrhino on 04:29:42 PM / 29-Jul-17
I am a HVAC tech.  For older automotive systems using r12 take a look at a product  called HC12-A. It can be muxed with r12 I've used on several older cars vs converting to 134a peace


Yes, I've been researching R12a since my last post and I think that's the way I'm going to go. I've also found there's plenty of R12 cans for sale on eBay, a bit spendy though.
Title: Re: Making my old a/c work again.
Post by: ndd on 12:11:13 PM / 31-Jul-17
Type in hc12a into any browser found it on amazon as well I used an older r12 can tap to use info readily a available
Title: Re: Making my old a/c work again.
Post by: 86forever on 09:02:36 PM / 01-Aug-17
whats cheaper r12 or convert r134?
Title: Re: Making my old a/c work again.
Post by: ndd on 09:02:44 AM / 02-Aug-17
If it was me I'd add hc12a and be done
Title: Re: Making my old a/c work again.
Post by: weitrhino on 02:48:47 PM / 02-Aug-17
whats cheaper r12 or convert r134?


R134 is a lot cheaper than R12. The nice thing about R12a is it's nearly as cheap as R134 and you can put it right in an R12 system.
Title: Re: Making my old a/c work again.
Post by: ndd on 06:58:49 AM / 03-Aug-17
Going to 134 actually will result in less overall system capacity.  R12 is not cheap.  If you have system with slow leak that needs to be topped off it can become costly.  Going to hc12a is cheaper has better performance  uses same components and requires no oil change and is considered environmentally friendly I have used hc12a with very good success.  But what way is cheaper? If done right, after initial conversion 134a cheaper.  But hc12a is easy and cheap. Long live the s12!
Title: Re: Making my old a/c work again.
Post by: 86forever on 01:33:31 AM / 21-Feb-20
Its been 3 years and my a/c is still working. I love it!