Our radiator caps from Stant, AC Delco and Motorcraft are direct replacements for the original cap that came with the vehicle. We offer a wide variety of radiator cap styles and applications for U.S. and import light trucks and HD trucks. The radiator cap is often overlooked in common engine overheating problems. It is designed to add pressure to the cooling system and increase the boiling point like grandma's pressure cooker. A faulty radiator cap can cause your light, medium or heavy duty vehicle to boil-over at a lower temperature, but a new radiator cap is an easy and inexpensive repair.