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Instructions. Park the vehicle on hard, level ground and allow the engine to cool completely. If you're only adding antifreeze, then open the hood and locate either the radiator cap or the coolant overflow bottle under the hood.Turn the cap counterclockwise to open it, and add your manufacturer-recommended antifreeze until the radiator is full, or the coolant overflow bottle is filled to the COLD line.nstructions. Park the vehicle on hard, level ground and allow the engine to cool completely. If you're only adding antifreeze, then open the hood and locate either the radiator cap or the coolant overflow bottle under the hood.
2. Drain the antifreeze out of your car. The thermostat and radiator hose are linked to your car's cooling system; if you don't drain out the coolant, you're gonna get water everywhere when you start disassembling. Here's how: 1  Place a bucket (or some sort of container) underneath your radiator.ou can twist the wires onto the thermostats connectors, or follow the directions manual provided by the manufacturer. 1  Your new thermostat should have the same corresponding code on the back, unless otherwise noted in the instructions. 2  Some thermostats are as simple as a two-wire system.