We have had a long-term coolant problem with our car. It's been going on for at least 18months now. It started with us losing coolant on long journeys. We don't notice it when driving - it's when we come back to the car after it's cooled down that we get a 'low coolant' light on and signs of coolant having been blown out of the coolant tank.
Our garage (who we've used for years and trust) don't know what the problam is but are suggesting that it might be a 'slight' head gasket problem pressurising the coolant system with exhaust gas and blowing it out of the pressure cap. Their view is that, as they don't know exactly what's wrong with it, they can try a number of fixes starting with the cheapest but that sooner or later we're likely to find the gasket needs changing.
What I'm not sure about is whether it's possible to have a long-term 'slight' head gasket problem. I thought head gasket problems got pretty bad pretty quickly. This has been going on for 18months (~15,000 miles).
Any views?
