Recently ive been reading about a few astras running high on temperature, now this is gonna seem basic, and i hate teaching people to suck eggs, and mods if this is totaly irrelivant to anything please delete this thread. Thing is today i was sitting in traffic, stop start type stuff when i glanced at my temp needle and it was reading just over 100 degrees Everything rushed through my head, i tried to use my vents/blower to cool it down but just my luck the blower wasnt working!! things were getting worse until at the last moment the traffic lightened and was able to "put my foot down" to get cool air into the bay! it wasnt until i got home that i relised last night i had topped up the coolant with antifreeze, then i relised that for the past few times its needed topping up ive only used anti freeze! in short it was a lack of water in the coolant that was causing the high temp!! so please people, check your mix ratios, anti freeze does exactly what it says on the tin, stops it freezing and not acts as coolant!!
Anyhow proberly totaly irrelevant to anyone so i posted it here, just to share my experience