coolant loss

Folks,
I have started to lose coolant from my '84 245 DL w/200k+. It's got a
relatively new (20K)metal radiator. I've checked the overflow tank cap
and can't see any cracks, the oil looks fine with no suds and I can't
see any puddles or places where it's leaking. I have not taken it in
for a pressure test yet because I prefer to try to fix it myself. It
loses about 10 to 15 oz a day or about 20 to 30 miles driven. Any
suggestions on what I might be missing?
thanks,
Bob

 

With the engine cold, remove the radiator cap and start the car. Watch
for bubbles to appear in the coolant, particularly after the thermostat
opens. If you see them, it's the head gasket. You may also be able to
smell antifreeze in the exhaust.


Gary

 

Is it going in the puke tank then not sucking back when it cools because
the cap isn't sealing?
If you think it's a head gasket, pull the plugs. the plug in the
offending hole will be washed shiny clean.

 

Look closely at the side of the block below the water pump. It probably
just leaks cold and not enough to drip very noticeably on the ground.
When they leak very slowly the coolant runs along the oil pan gasket and
drips from the bell housing. It self seals when warm and driving
evaporates the small amount of coolant as you drive. There will be a
crystalline residue on the motor below the pump and perhaps a line of
dried coolant on the bottom of the hood from the fine spray coming off
the fan blades.

Bob