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Am I using the right additive? Did you have time to test it on the car or did you sell it before? Many people use a product that damages the system instead of protecting it. Below is a link on how to change the water in the system and another one testing a thermostat. Do not use fire to test this part, test it with water, fire reaches different levels than hot water and can damage it before you use it. I only use Havoline Xtended Life concentrate, 3 liters and topped up with tap water, it is a 5-year product and I change it every 3 years in the same car since 2002. This same additive used to be called Havoline long life, but the name has changed and it still has the same quality standard and you can't find it in auto parts. • CHANGING THE WATER IN THE RADIATOR OF A VECTRA, ASTRA... • TESTING THE THERMOSTAT BEFORE PUTTING IT IN...