It never rains eh, just got back from a slow traffic filled journey and whilst on a slight incline the temp gauge started heading north and the aircon stopped , didn't go into the red , roughly three quarters of the gauge, never happened before in nearly three years of ownership, traffic started moving and straight away the gauge was back to normal and the aircon was cool again, get home bonnet up all fans are working and idled for 10 mins gauge didn't move, could it be low coolant ?.
Couldn't check as car was hot, so when cold where should you top up and where is the level ?, expansion tank I assume.
Thanks in advance