A/C question - S13 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Rittmeister · 02-01-2009, 02:59 PM

Here's the situation. I have a 1990 S13 with SR swap. I re-used the SOHC air conditioning compressor by means of a ghetto-rigged bracket; it's always worked fine, UNTIL last year when the tensioner pulley seized and burned up. I mean literally, the paint burned right off it and it broke the belt.

The pulley I sourced to replace it has recently started to squeak (yes, I do know it's the tensioner pulley and not something else). I'm starting to think that the "custom" bracket doesn't hold the compressor where it should be - not that it's loose, but that when everything's put together the belt isn't in exact alignment, which puts some kind of undue stress on the weak link, i.e. the tensioner pulley.

Editorially, this doesn't surprise me; this bracket was made by the same guy who screwed up my wiring harness for the swap, so if it's not right that would stand to reason considering the source.

But I digress: here's my question. Let's pretend that I source a DOHC S13 A/C compressor, Codyace's bracket to mate it to the SR block, and the appropriate lines. Will the lines bolt up to the rest of the components in the car? That is, will the big hardline bolt up to the fitting in the firewall, and will the smaller hardline bolt up to the fitting on the condenser just behind the driver's side headlight bracket, or are the SOHC and DOHC A/C systems completely different, which would mean all new lines, dryer, condenser, etc?

Obviously I'd have to source the parts, have the system evacuated of coolant and then re-filled with the newer stuff (R134, right?) when finished, but at that point it'd all work, I think. I have an SR compressor but no lines, and I don't have a means to have those lines custom-ed up anyway to work with my chassis.

Any input appreciated.

xsparc · 02-02-2009, 11:30 AM

No.... and the SOHC used R12.

For it to work right you will need to get custom lines made. Well at least thats what i had to do with my 89.

SoSideways · 02-02-2009, 12:02 PM

Quote:

Originally Posted by xsparc

No.... and the SOHC used R12.

So did the 91-94 S13s.

Ritt - you need to try to get custom lines made, because the stock 91-94 lines will place the line right in front of the turbo intake, unless you're no longer going with a bottom mount turbo.

While you're at it, you can have them retrofit an R134a fitting on there to run R134a. I've known people to run the R134a conversion stuff and not had any problems.

As a matter of fact, I ran the R134a conversion stuff in my car, and had no problems.

Rittmeister · 02-02-2009, 02:32 PM

xsparc - I know the car is R12. I was figuring that the DOHC S13s were R134, and that's what I'd need if I swapped over.

SoSideways, thanks for the info, looks like I need to do some more research.

xsparc · 02-02-2009, 02:38 PM

SoSideways is right, most s13s were R12, but i did find a few that were R134a.

However, the DOHC and SOHC lines are NOT interchangable in any way. The fittings on the evaporator are different sizes too.

02-01-2009, 02:59 PM	#1
Rittmeister Zilvia FREAK! Join Date: Jan 2003 Location: Cincinnati OH Age: 47 Posts: 1,033 Trader Rating: (9) Feedback Score: 9 reviews	A/C question - S13 Here's the situation. I have a 1990 S13 with SR swap. I re-used the SOHC air conditioning compressor by means of a ghetto-rigged bracket; it's always worked fine, UNTIL last year when the tensioner pulley seized and burned up. I mean literally, the paint burned right off it and it broke the belt. The pulley I sourced to replace it has recently started to squeak (yes, I do know it's the tensioner pulley and not something else). I'm starting to think that the "custom" bracket doesn't hold the compressor where it should be - not that it's loose, but that when everything's put together the belt isn't in exact alignment, which puts some kind of undue stress on the weak link, i.e. the tensioner pulley. Editorially, this doesn't surprise me; this bracket was made by the same guy who screwed up my wiring harness for the swap, so if it's not right that would stand to reason considering the source. But I digress: here's my question. Let's pretend that I source a DOHC S13 A/C compressor, Codyace's bracket to mate it to the SR block, and the appropriate lines. Will the lines bolt up to the rest of the components in the car? That is, will the big hardline bolt up to the fitting in the firewall, and will the smaller hardline bolt up to the fitting on the condenser just behind the driver's side headlight bracket, or are the SOHC and DOHC A/C systems completely different, which would mean all new lines, dryer, condenser, etc? Obviously I'd have to source the parts, have the system evacuated of coolant and then re-filled with the newer stuff (R134, right?) when finished, but at that point it'd all work, I think. I have an SR compressor but no lines, and I don't have a means to have those lines custom-ed up anyway to work with my chassis. Any input appreciated. __________________ E36 M3 - new project 1990 240SR - screamed down the road

02-02-2009, 11:30 AM	#2
xsparc Zilvia Junkie Join Date: Dec 2002 Location: san diego area - esco Posts: 461 Trader Rating: (0) Feedback Score: 0 reviews	No.... and the SOHC used R12. For it to work right you will need to get custom lines made. Well at least thats what i had to do with my 89. __________________ No... no one stole my interior... its safely in my garage...

02-02-2009, 02:32 PM	#4
Rittmeister Zilvia FREAK! Join Date: Jan 2003 Location: Cincinnati OH Age: 47 Posts: 1,033 Trader Rating: (9) Feedback Score: 9 reviews	xsparc - I know the car is R12. I was figuring that the DOHC S13s were R134, and that's what I'd need if I swapped over. SoSideways, thanks for the info, looks like I need to do some more research. __________________ E36 M3 - new project 1990 240SR - screamed down the road

02-02-2009, 02:38 PM	#5
xsparc Zilvia Junkie Join Date: Dec 2002 Location: san diego area - esco Posts: 461 Trader Rating: (0) Feedback Score: 0 reviews	SoSideways is right, most s13s were R12, but i did find a few that were R134a. However, the DOHC and SOHC lines are NOT interchangable in any way. The fittings on the evaporator are different sizes too. __________________ No... no one stole my interior... its safely in my garage...