U045a

Dear Sir
Welcome, and thank you for trusting us
heating in your car causes : 

1. The plastic container that you top off has a leak. (Check underneath it for puddles, also make sure the hose between it and the radiator is not leaking).
2. Radiator (Look on the bottom for drips, it is typically behind the grill in front of the engine)
3. Water Pump (This one can be harder to spot leaks with, normally is powered by a belt and has at least one large hose if not two between it and the radiator)
4. One of the cooling hoses (You can give them a little squeeze to see if they are hardening up and to see if fluid leaks out anywhere. You should be replacing the upper/lower radiator hoses occasionally as it is, so definitely give them a check if you haven't replaced them in the last few years.)
5. Head Gasket or other engine gasket (harder to spot, check the other places first and look for oil in the coolant)
6. Radiator cap

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Kind Regards
Engineer mohammad