I've got a problem with my 94 940 that I wonder if anyone has seen before.

The transmission oil cooler in the radiator has apparently failed and dumped transmission oil into the cooling system.

My troubles began about a week ago, during the recent cold weather.
The transmission became sluggish to shift into gear.

My first thought......120K miles...transmission never serviced.....transmission oil has thickened and cold weather is adding to the problem.

I flushed the radiator with new fluid....complete flush....and topped off the fluid.
When I was finished, I compared the amount taken out to the amount put in and realized that the transmission was about 3 quarts low to begin with.
What the hey?

Anyway, the tranny shifted good again, and since it was so cold, I didn't look further.

2 days later when I was checking the fluid level again, there was transmission oil all over the engine.....what the h###?
The upper radiator hose was split at the connection to the thermostat housing, and it was spraying "muck"....oil and coolant combined....all over the engine.
Where was the oil coming from? The Transmission.
The engine temperature gage showed normal through all of this.

I checked the engine oil, it was clean and the correct level.
Checked the transmission fluid, it wouldn't register on the stick.
The transmsission oil was leaking out of the oil cooler inside the radiator and filling the cooling system.

The fluid that I had flushed out 2 days before showed no indication of contamination with coolant. Thanks goodness the liquid was flowing in the direction it was and not the reverse....coolant flowing into the transmission.

Anyway, I have a new radiator on order, and I won't be driving the car...or even cranking the engine until it is installed.
I plan on flushing the engine before installing the new coolant.
Any recommendation on the type of radiator flush to use?

Sorry for the long post
steve