What coolant was in the before? If it was green stuff, you're not doing the engine any favor by adding a gallon of G-05. The next time you see the car, drain the radiator AND the block and fill with one kind of coolant in an appropriate proportion with water.

Sixto
93 300SD

That is what i did. Any links on how to drain the block. This is new to me. Thanks sixto

The block drain plug is just ahead of the starter. There's a pic in this thread -

Nightmare locating thermostat, drain plug

Sixto
93 300SD

I did find this everybodychech it out.
Courtesy of Brian Carlton

You can't see the starter or the block plug from the top. They are below the manifolds.

Go underneath, on the passenger side, and find the starter, neatly tucked into the side of the block, below the manifolds and at the very back of the engine.

Now find the very forward end of the starter.

Go three inches further forward and about 1 inch vertically upward and there will be a bright hex plug that sticks out of the block. That's the block plug. It won't be difficult to remove.

Courtesy of Boneheaddoctor

I'll look...if you can feel the bracket that goes from the top rear bolt of the mount pedital to the exhaust manifold...then feel the area around 10-11 oclock based on that within a hands width....it will be the only hex head you will leel in the area...you can see it from underneath but not from above.
passenger side...look at the bottom of the photo close on the right side you well see the passenger side motor mount pedistal.....its just behind and obove that. Where the red circle is....which is near the front edge of the starter and just above.