Replace hoses that are cracked, swollen, soft and spongy, hard and brittle, or leaking at the ends. Squeeze them when the engine is cold: a healthy hose feels firm but flexible.

Worm drive clamps suit most general purpose hoses. Spring clamps are common on factory cooling hoses because they keep tension as the hose expands and contracts. T bolt clamps suit larger hoses and turbo or intercooler hoses under boost.

Measure the outside diameter of the hose once it's fitted over the pipe, then choose a clamp whose range covers that size, ideally with the measurement near the middle of its range.

Yes. The radiator cap holds the cooling system at the right pressure, which raises the coolant's boiling point. A worn cap can cause coolant loss and overheating. Replace it with one of the correct pressure rating.

No. Hoses are made for specific fluids, temperatures and pressures. Use hose rated for the job, such as coolant, fuel or vacuum, and the correct internal diameter.