Has not overheated coolant before this was done was evaporating from time to time could leak be behind the timing cover where the water jacket is located?
I can't tell you where your leak is because I can't see your engine...You need to take a very careful look at everything...every hose, hose connection, parting line between heads and block, between thermostat housing and engine and even at the water pump (you may not have gotten all of the old gasket off). If a good visual inspection shows nothing, you can pressure test the system and do a cylinder leakdown test and a hydrocarbon test at radiator to eliminate internal problems. Last but not least, you can have a dye test done (dye added to cooling system, leaks checked with a black light). Can the housing gasket leak? yes...but you need to check everything to determine if it is.
Any fluid leak can be hard to locate even if you have the vehicle in the air.
Assuming you mean you have just changed into a new water pump, and assuming the new water pump has the correct gasket and sealant applied correctly, and that the new water pump is not defective from the factory.....I'd say start examining the radiator for very-very small pin holes (not easily seen many times) also check your hoses for the same problem.
Other then that, if you had a reputable garage replace the water pump, take it back to them and tell them the new problem started after they worked on it. Could be they didn't do a good job from the start.
Without seeing yoru car, knowing what it is, it's rather difficult to hellp you find the leak, I wish I had more too tell you.
Hope this helped at least some.
Terry
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