Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to install a coolant flush kit [title] Check the engine to make sure it is no longer hot. [step] Loosen the radiator cap to release any pressure still left, and then re-tighten. [substeps] Many newer cars have the cap on the coolant reservoir instead of the radiator itself, but, on certain cars, there may be no radiator cap at all.

Ending1: [title] Inspect the engine for any leaks or clogged air filters. [step] Warning : [title] Remove tank plates from engine. Ending2: [title] Loosen the radiator drain bolts. [step] Loosen the hoses on both sides of the radiator using a wire stripper. Ending3: In this case, emit the pressure by loosening the thermostat cap. [title] Place a pan or bucket under the radiator plug beneath the car to catch the old antifreeze. Ending4: If so, it's probably due for a stop so you need to watch carefully for a reaction. If you hear a hissing noise from the radiator, the coolant is likely time to start again.

Answer format: ending1/ending2/ending3/ending4