the vectra temp rise to 80 c on the gauge after i drive for about 20 mins the highest the gauge goes to is 100 c then there is 3 red marks after that
is coolant too low or some thing wrong
What is the level of the coolant? Is it at the min line on the resevior?
1st step ensure sufficient coolant is in the reservoir, next step, check the electric fan is kicking in when the temperature gets high this lets you know if the thermostat is opening and closing properly allowing the hot water to be cooled down, a thermostat is not expensive and easily changed. If the thermostat has been renewed and the problem re-occurs your next road of investigation is the head gasket or water pump
check coolant after every drive, if down you may have a leaky water pump which doesnt leave a puddle, or a head gasket issue, the cheap out for the head in a product called chemiweld (or known as car yards best friend), follow the instructions (drain coolant, fill with water and chemw drain again, add coolant). Then again if you dont drive far jusu buy ag new radiator cap if it has one and keep filling it up.
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