Level Check
Look for wiring harnesses exposed and improperly routed, as well as the fluid level incorrect and dirty. High fluid level is a bad sign; it shows that more than likely someone inexperienced worked on it or another fluid is mixing with it. Too low, then there is a leak that’s been cleaned or unseen. Coolant jugs with a ring around the top are usually caused by oil or fuel in system. Wrong coolant can unglue injector cups over time and eat away your engine block.