Ever since Ive had my williams(nearly a year), Ive noticed the smell of coolant inside the car more so when hot. I know its not very good to breath in so I had a look to see if I could see any leaks, I found the top of the exspansion bottle had a small crack right on the seem and I could see a little blue coolant around there. Also when I have been working on the car with the engine still warm Ive heard the exspansion bottle cap hissing, is this normal as Ive not noticed it on cars Ive had in the past?
Ive now replaced the bottle but still get the smell! Im having to drive around with the windows open its that bad.
Has anyone had this problem before or know what it might be?