Forum Discussion

WesternHorizon's avatar
Jan 24, 2019

Radiator aux cooler: Leaking fittings

1995 Tioga Montara Class C on a Ford E-350 chassis, 460 V8, E4OD transmission

Has recently started weeping fluid at both connections to the auxiliary cooler. Just a few drops have slid down and are hanging on the line that runs horizontally below and behind the radiator. No detectable drop in fluid level, yet.

Recent switch to synthetic may be a little too slick for the old connections. Strange that both are apparently weeping equally, not just one.

Can anyone identify the brand of cooler in case I need to replace the lines? I have posted photos here:

http://bit.ly/2RZEajn

Also getting the specs will help me decide whether I want to upgrade to a new and higher capacity cooler.

The Hayden chart implies cooler ATF is a very good investment: Hayden chart

Meanwhile...the left hose clamp is not loose at all. Very tight. And the photos suggest the leak is actually above the clamp, at the fitting.

Next step would seem to tighten the fitting just a bit.

Constructive suggestions welcome. Thank you.
  • I'm going to bet that it is the hose and not the fitting. The greasy accumulation on the fitting hex may have migrated upward on to the hex. Transmission fluid is pretty thin and as it leaks it will pick up dirt. The fresh dirt will soak up the fluid and more dirt will accumulate. Add some wind and a little rain and it could very well look like what you have. I'd replace the hoses any way because of the age and the end looks like it has started to bell from being squeezed by the clamp for a very long time and the heat probably hasn't helped any. You can also make sure the fittings are tight when replacing the hoses.

    Make sure the replacement hose is good for transmission fluid as well as the amount of heat it will be handling.