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Good afternoon. I’m hoping you can offer some guidance as my recently purchased Vectra V6 is giving me trouble. The car drives perfectly and so it should with a mere 50,000 miles on the clock, however I’ve found after a prolonged motorway drive, the coolant level drops and I’m required to add around 250ml to top it up. I cannot see any leaks under the car, or smell any anti-freeze, and the cooling system does not appear to be building excess pressure. My local mechanic reckons that the Vauxhall V6 is known for using coolant and thus, it’s not something I should be alarmed over. This however, does not sit well with me. I await your words of wisdom. Graham Cook.
AThis is one of those situations where there is an issue but it is so slight that the cost/time required to investigate and rectify the problem simply cannot be justified. Yes, it’s an issue and no the Vauxhall V6 isn’t prone to randomly use coolant by design, so there must be something wrong. What exactly, remains to be investigated.
Our first port of call would be a pressure check either when warm or overnight, as when engines are cold, metal contracts and thus hairline cracks and so on may seal up temporarily. We also recommend the ‘sniff’ test of the coolant, in basic terms checking the coolant for traces of hydrocarbons, i.e. exhaust fumes, which in turn could hint at a head gasket or head casting issue. It really is hard to advise what to do. Yes the car should be perfect but at what cost? Until you can identify the source, then we’d avoid unnecessarily replacing gaskets or components as costs will mount. We hate the term, but perhaps ‘let the fault develop’ until it becomes more obvious, though not so obvious the car runs dry and overheats.
Should a V6 Vectra be using excess coolant?