'95 GLT with over 180K miles-coolant slowly leaking, and no sign of it under the car. Radiator replaced about 3-4 years ago with OEM part, and Coolant container replaced at the same time.
No white smoke.
Water pump never replaced.
Where should I look - I want to have it fixed -it's my father's daily driver.

Thanks

 

I'll put my money on the heater core. Can you smell coolant when you first turn the heat on?
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You would have won!

it isthe heater core -car is my father's , I had a look today -inside carpet soaked with coolant.