drwhosc

Thinking about doing some RnR and the lines to cooler #7. They are sketchy, and thinking about working on them while i am in there, but I don't know what this is, and where the hoses go. I am replacing the shock with my motor mount job, so now is the time. I am also doing the steering system as well.

I have an 88 s4

Bilal928S4

Auto trans cooler.

drwhosc

Does that mean I have two, because I thought the auto trans cooler was connected to the radiator.

ammonman

Two coolers. One in the right radiator tank and the second is item #7 above.

Mike

Alan

Transmission Fluid/Oil Cooler... not just for autos.

Alan

drwhosc

Ok Will trace the lines. is this one and the rad cooler in series or separate??

drwhosc

Ok found the parts diagram, so in series. Who would have thought two coolers for AT

Bilal928S4

Alan,
Both my 5 speeds don't have that cooler. The AC condenser is larger in them.

siscogts

My gts 5-speed has that #7 cooler.

the flyin' scotsman

you need to get yourself a GTS Bilal

Bilal928S4

Yes, I am working on Tony to give me his GTS for Christmas and I will let him drive it whenever he visits Connecticut.

Vilhuer

Auto coolers are in series for a reason. When fluids are cold water will heat up more quickly and help to heat trans oil. When trans oil gets hot separate cooler helps to keep it around same temperature as water. Manual GTS do not use inbuild radiator cooler.

cobalt

What do you mean by Inbuild are you referencing #7? My 5 speed GTS has this cooler as well.

Vilhuer

Radiator end tank cooler is not in series with external cooler like in automatics. Gearbox oil goes only to external top cooler.

drwhosc

I get it now, Thanks Vilhuer. So all cars will have the trans cooler, but the autos will use the radiator as well to help regulate the temps. Cool design. Well I have to wait until mid dec to get my new radiator, but I have lots to do. Going to see if I can replace the autotrans cooling lines. They look like they may be hard to get to though... Does not surprise me in the engine compartment. Wonder if the 90 degree heads really helped all that much over the 60 degree heads that everyone else used. Sure does make it tight in there...