Q:
A: Just drain the coolant and start with new coolant. You probably need new coolant on a car that was discontinued in 2002 (if you have a 'phase one 306', it was discontinued in 1997. only 13 fuses in the fuse box). Your engine is aluminum (aluminium) and the greenish stuff is fine. After you run the engine for a while, check the level again, paying attention to the reservoir tank. when COOL.