[W126 Coupe] Coolant Leak

[Mike R.]

I have a coolant leak that I can't find. The anti-freeze drips off the
passengers side of the engine, up front but there isn't anything obvious for
the source. The water pump weep hole is dry and as far as I can see, even
with an mirror, there isn't any leakage from it the water pump/motor gasket.
I've looked at the thermostat housing as well as the upper and lower
radiator hose connections, but nothing there either. I looked under the
intake manifold just a little (place on the passenger side in front of the
front intake runner), but no puddles under there either.

 

I tried some air pressure in the system through the overflow tank and did
make it drip a little faster, but nothing apparent for a source. I drove the
car and that seems to have slowed down the leak. Went out to a restaurant
last night and back, nothing on the ground under the car at the restaurant
or my garage this morning. Self healing leaking? Any ideas where to look?? 

 

There is a hose, ~1", that starts somewhere near the water pump and  goes
toward the back of the engine compartment over the air pump - what's that
for?? Nothing apparent from it but I couldn't see where it attached on the
front of the motor.

 

Thanks,

Mike R.

 

 

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