txhokie4life

My tranny cooler gave up the ghost.

Trying to find a reasonably priced replacement has been a challenge
and I'm of the mindset of not replacing it with a 30 yr old used one.

I was wondering if anyone knew the dimensions of the 928 tranny cooler inside the radiator?

I'm thinking of replacing it with an aftermarket new radiator, but put it back in the radiator where the old one resided.

thanks,

Mike

soontobered84

Mike,
My '84s have an external cooler mounted on the lower cross valance thing in front of the radiator. You might check with 928Intl and go that way with your cooler.

brutus

The external trans cooler is used in addition to the heat exchager in the radiator plumbed in series so not designed to be used alone.
The Euro S and all other 928s except for USA 80-84 cars ALSO have the engine oil heat exchanger in the radiator. So your replacement needs to be a two cooler equipped radiator.

jeff spahn

My 90 does not have an oil cooler in the radiator. It came from the factory mounted under the radiator.

928mac

If there are replacement parts out there then the vendar, Roger, 928Rus, or Mark the owner of 928intel would be your best sorse to check.

If it was me and nothing was available then I would bypass the rad cooler and mount a large RV trans cooler by the grill with a fan drawing air through it for when you are stuck in trafic. You can even mount a guage sender in the line and put a trans tem gauge in the car.
Now that I think of it, I think ILL mount a trans temp gauge on mine. ha ha

brutus

Correct later S-4 did go to an external air only engine oil cooler mounted below the rad. Not the best idea as they often leak but at least the leak is noticable rather than hidden n the coolant.

jeff spahn

Yep, on my second one now.

MarkRobinson

There's an external tranny cooler on our old 928S parts car at Austin VW that I bet you can get for cheap: just re-run the lines to it. It's mounted on the nose subframe, about 12x3x1.5 or so.

Mark

17prospective buyer

Yes but i heard that the in rad oil cooler wasn't really the best for cooling because when the engine is running at operating temp (213F or so?), the oil won't really get much cooling as it will only be able to drop to the temp of the coolant (and heat loss on it's way to and from the in rad oil cooler through the lines).

dr bob

The radiator oil cooler helps warm the oil more quickly on cold start, and does a much better job cooling the oil in slow traffic than the external coolers on the later cars. Imagine a run at freeway speed, than the exit ramp and slowe traffic. Oil is hot from the higher-load run, but no airflow through the external cooler sitting at the light at the end of the ramp.

Coolant temp on my car runs at the 190º thermostat setpoint midway between the 170º line and the 210º line, and only seldom reaches the 210º mark on the gauge. The guage reads the temp of hottest coolant headed to the radiator. The oil cooler in the radiator sits in the cold-side tank, so the temp there is (hopefully) colder than what the coolant temp gauge sees on top of the engine. Engine oil likes to be in the 125-170º range generally, and will tolerate 225º. By somewhere north of 250-275º oil temp at cooler inlet, the driver should be sweating too.

GB offers a hose kit for late cars that puts a radiator oil cooler in series with the the factory external cooler on late cars. If you have a '90+ car and can install an earlier radiator with the oil cooler in the tank, you can have the benefit of the extra cooling protection.