My s4 ac compressor is no good but i have a spair s5 turbo 2 ac compressor can it be swapped in, and will i need anything part wise to do it? any help would be great, i used the search function to no prevail and couldn't find anything...

 

AFAIK.. same units

 

There are/were two types of compressor. Sanden and ????? the other one. Connections were quite different. Just compare the two compressors your dealing with and if the connections are the same then swap 'em out. Connections different? Problem.

Sanden.............Nippodenso

FSM...............HEATING AND AC ...............use the series FIVE FSM for this not the series four which is .......inadequate.

See JPG ATTACHED.

 

series 4 is a Nippondenso unit, series 5 is a Sanden. not interchangable without swapping the lines off the pump itself as well as the a/c mounting bracket on the engine(different bolt patterns for each pump).

the series 5 flows more but also isn't as reliable for higher pressures required for changing to R134/154a. series 4 is more reliable for conversions but doesn't give quite as cold of a charge. cooked a few Sandens but not a Denso unit yet.

 

I didn't know the Sanden was higher capacity, good to know! I will say that I have had no trouble with the A/C capacity on the S4 systems, whether charged with R12 or R152a. They cool very nicely.

One other thing: R152a charging will NOT yield higher pressures than R12. It is essentially the same pressure curve up to about 300 psi (170* compressor exit temperature). Working pressures on the high side pressures on your FC system should not be typically exceeding 300psi. At that same temperature, R134a is 40 psi higher.

If you get up into the 400+ psi range (200*) 152a will be about 10 psi higher, while R134a will be 60 psi higher.

 

Actually, my S4 Vert came stock with a Sanden. Just the end housing is different where the lines mount. S4 is a single bolt manifold, S5 is bolt for eash of the two lines. Any repuatable AC shop can swap out the end housings if your S4 indeed came with a Sanden.

 

Its a car 1986 rx7 glx that i work on for a friend.
Just fixed his fuel leak and car is road ready but his s4 compressor is no good.
I had to research this issue first he has a spair s5 turbo 2 compressor thats why i asked.

Thanks.

 

I gotta see if he has the rest of the parts can the mounting bracket be bolted on without modification?

 

If we turn on the ac the unit actually locks its self, i had two spairs but scrapped them like an idiot...

 

If it's out of an '86, then I concur with Ben it is most likely a Nippondenso unit. Manifold probably mounts to the top middle of the compressor rather than the rear housing as on a Sanden.