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Cooling
Cooling system guides. Never open a hot radiator or coolant cap — wait until the engine is cool to the touch.
Common problems
- Low coolant or a leak
- Cooling fan not running
- Stuck thermostat
- Worn raw-water impeller (boats)
Related guides
guide
Engine Overheating: What to Check
Temperature gauge climbing? Here's how to stay safe and narrow down the cause from coolant to fan to thermostat.
Beginner–Intermediate · 30–90 minchecklistSeasonal Car & Truck Maintenance Checklist
A printable spring/fall walk-around for cars and light trucks that catches problems early.
Beginner · 45 min