I had the cooling system pressurized overnight starting with hot engine and let it cool down under pressure. Not a speck of coolant on the floor in the morning or loss of pressure.
I could see some faint moisture around the rear of water pump connection to engine block and by the heater pipe connection to water pump but no safe evidence at all about a bigger leak. No traces of coolant from radiator tanks.
Based on customers pictures, where they had seen the leak, being the original water pump at 118K miles together with what I had seen before of the leaking o-rings at rear of water pump I suggested to replace the water pump.
It was easier to see the flattened o-rings and traces of coolant when everything was apart but I will not know for sure until they have picked up the car and driven it for awhile if my suggestion and guess was good enough.
That's how difficult it sometimes can be and I would hate to get negative feedback unless first trying to work it out with the customer.
Having to fill coolant every 1-2 weeks should leave some traces you would think but I know that the rear of water pump o-ring leak dries up very quickly when engine block heats up.
Never the less, if the new pump and o-rings didn't stop it and if the pump and o-rings were installed properly, next common leak would be the A/C heater bypass valve that usually only leaks when the A/C is on full cold.
Do you see any traces of coolant on the ground or floor?
If not, it might be the cylinder head gasket having a small leak.
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