This morning I was driving to work at 7am all bleary eyed etc in my 98 Astra.
It was very cold and I noticed that the heaters were not running hot.
I then noticed that the temp gauge was on max, I was on a road where it’s impossible to stop so I couldn’t pull over.
Suddenly there was a funny sort of noise under the hood that sounded like popping or tapping and the heaters instantly ran hot.
By this point I was 5 mins from work so I carried on.
When I got there steam started to bellow out from under the hood.
I lifted it and it was coming from the coolant reservoir.
I waited for it to cool and then took the cap off….the coolant was pretty much empty.
I topped it up with water and coolant and then went to work.
At lunch the level in the coolant had dropped so I topped it back up and checked under the car for dripping which there wasn’t.
Any ideas why? Could it just be that I am now filling the system and the level is dropping slowly as it fills up?
I have checked the oil cap and its jet black and the car starts fine.
Am I likely to have caused any serious damage?