I'm from the UK. I have an Astra H Mark 5 09. I have been getting a fault code, which suggests the thermostat is faulty, but I don't have any symptoms of a faulty thermostat. Could it be the heating element that is gone bad?. The problem I have is when I cold start the car, it starts the first time. When I turn it off or go for a short journey, it won't startup. I must turn the key twice. It always starts on the second attempt. Any suggestions?
Hello to you in the UK. I am not familiar with the Astra H. Just knowing the starting system in vehicles I would look at the starter first for sings of going out then like you said, check the heating elements, especially the one on the exhaust. Heating elements build up filth fast when on the exhaust.
Updated on January 3, 2020