I told them I only wanted a oil/filter change and not to touch anything else. Them came into the waiting room just to let me know my radiator cap was bad and needed replaced. The tech had a pressure tester, just to show me. I have a new truck and told them not to mess with anything else. They wanted to sell me a new radiator cap, and I said no! I got home and radiator fluids was leaking from my cap. After cooling off, I tighten it and seems to stop the leak. The time before it was a burnt out light? What's next???