1997 Chrysler GS Voyager 3.3L (EGA):
Decided to renew the coolant (previously had just water) in the engine/radiator. Prior to this, the radiator showed no signs of leaks, but after renewing the coolant, there is coolant seeping from behind the brass trans cooler fitting (screwed into the plastic tank). This internal fitting protrudes out from the plastic tank and is secured only by a thin metal washer and thin nut (refer to attached image of an identical fitting).
So, just to be clear: the coolant is leaking from the body of the plastic radiator (behind the fitting).
The nut wasn't very tight, so I tried tightening to stop the leakage, but didn't seem to make much difference as coolant was still seeping out from behind the washer. I didn't want to tighten it excessively, in case I damaged the plastic tank.
To inspect the fitting, I drained some coolant and removed both nut & washer. There was no o-ring or seal behind the washer. The fitting can be partly pushed into the tank, allowing coolant to escape.
It appears this fitting mates against the internal wall of the radiator when tightened with the nut on the outer wall, but I see no way of sealing the fitting.
So, even though I've tightened the nut, there is still a "gap" in the plastic tank behind the washer, allowing coolant to escape.
Should there be an o-ring, rubber seal (or similar) behind the washer?
Is this repair a simple matter of using a suitable sealant compound?
Can anyone please suggest how to remedy this small leak?
Thank you in advance...
File comment: Example of brass fitting (trans cooler)
Radiator_Trans Cooler Fitting.jpg [ 201.54 KiB | Viewed 831 times ]