Charmalu, I never knew there was one on the bottom, I was always told to watch the one on the top.

I have a coolant leak too but in the middle of my A/c repair, while removing the condenser I found my radiator is actually a Nissens, it looks totally stock compared to our 83 300D but doesn't have the bear on top. My leak starts at the upper hose area, so I hammered down on all the aluminum lips that connect it to the upper plastic tank and that didn't fix anything.

It turns out, if I park facing uphill, I leak after driving, but if I park facing down hill, there's no leak. coolant will drip onto the lower oil cooler line and look like a much bigger problem but after cleaning the engine and letting it dry for a week I noticed its only the typical top seam issue.

I looked every where for a leak even after replacing the little return pipe on the passenger side and can only contribute the leak to the top of the radiator. I just ordered some hose clamps among other things so I can put two on the upper radiator hose connection and rule that out but I assume I'm approaching around 250k miles on a radiator which has a website printed on the sticker with the model number.

How old is a Nissens with a website on the sticker? 10 years?

My top weep hole is dry as a bone but I get the coolant smell in traffic occasionally. And with no fan guard and no distinguishable coolant spray, I still found coolant spray on the top oil cooler line after a full speed run.

I'll report back after installing both hose clamps on the upper hose at the radiator, since I think it could just be coming from the hose connection and pooling up on the top seam area.