Been getting a whiff of hot coolant last few days when car is hot and idling. Level has dropped a tiny bit. Checked the coolant tank to right of radiator and noticed a bubble every second or so.....Blobeye WRX PPP....under warranty fortunately. What do you reckon ? Head gasket? If so how long to fix at main dealer and do they use new cambelt?

 

Possibly a hose or rad leak, doubt if it is H/G.

 

Cheers. dealer says its water pump. Waiting for a new one...