Coolant dropping after 1k miles & water pump change

[bflare]

Hello, I have a 2007 Seat Leon FR Diesel with 146k miles on it. Around 3 or 4 months ago I had the cam belt changed along with the water pump by a friend. When he gave me the car back he told me to keep an eye on the water level due to having the pump changed. I am guessing he said this in case there was an air lock in the system?

8 days ago the coolant warning light was on so I topped up the coolant. I have done around 1k miles & this morning the warning light was on again. I have checked the water & although its a little rusty colour it isn't milky or anything. Just hoping it's not the head gasket.

Any suggestions?

Thanks.

[Belle427]

Any signs of fluid on the floor?
Its not uncommon for new water pumps to start leaking after a few weeks, ive experienced this twice.

[bflare]

Not that I have seen although I have not really looked. I have just checked the oil cap & water bottle & there isn't any discoloured creamy gunk or anything which would suggest the head gasket failing.