Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to install a head gasket [title] Obtain a service manual for your car's make and model. [step] It will include step by step procedures with images that explain how to replace your head gasket (s). It will also list any special tools that you may need.

Ending1: [title] Drain all of the oil and coolant from your engine. [step] Remove the parts that are connected to the cylinder head. Ending2: [substeps] A head gasket is a small piece of plastic that is secured to the rear window of the car. This will prevent fuel from leaking into the drive block or out of the space in the engine bay. Ending3: [title] Unscrew the screw closest to the head gasket (s). [step] Make sure this is the screw that has all the information written clearly on it. Ending4: [title] Detach the head gasket from the rear bumper. [step] If you are able to get a mechanical head gasket with a tool, attach it to the back bumper of your car so that the head gasket faces upwards.

Answer format: ending1/ending2/ending3/ending4