* Low Pressure Cap: If you use a cap with a lower pressure rating than the original, the cooling system won't be able to maintain sufficient pressure. This can lead to overheating because the coolant won't reach its optimal boiling point. Coolant will boil at a lower temperature at lower pressure, causing significant overheating issues.
* High Pressure Cap: Using a cap with a higher pressure rating than specified could cause excessive pressure buildup in the cooling system. This can lead to leaks, hose bursts, radiator damage, and even head gasket failure. The system is designed for a specific pressure range, and exceeding it weakens components.
Therefore, always use a radiator cap with the exact pressure rating specified by your vehicle's manufacturer. This information is usually found in your owner's manual or printed on the old radiator cap itself. If you can't find the correct information, consult a parts store and provide them with your truck's year, make, and model. They can look up the correct specification for you.
