Pick up a 2008 golf gti with the fsi motor. Owner told me it had a blown head gasket but did a compression test and they are all around the 150 psi mark. All plug had a white crust on them too. Smoked like crazy when I picked it up than after I did compression test doesn’t smoke at all just smells like burnt coolant. Does coolant cool the intercooler and I could possibly have a leak on the intercooler. Any help will be greatly appreciated.