Draining Engine Coolant

Turn ignition switch ON and set temperature control lever all the way to HOT position or the highest temperature position. Wait 10 seconds and turn ignition switch OFF.
Remove the engine front undercover using power tool.
Open the radiator drain plug at the bottom of the radiator, and remove the reservoir cap. This is the only step required when partially draining the cooling system (radiator only).

Fig 1: Identifying Radiator Drain Plug At Bottom Of Radiator
Courtesy of SUZUKI OF AMERICA CORP.

CAUTION: Do not allow the coolant to contact the drive belts.
Follow this step for heater core removal/replacement only. Disconnect the upper heater hose at the engine side and apply moderate air pressure [103.46 kPa (15 psi, 1.055 kg/cm² ) maximum air pressure] into the hose for 30 seconds to blow the excess coolant out of the heater core.
When draining all of the coolant in the system for engine removal or repair, it is necessary to drain the cylinder block. Remove the cylinder block drain plug to drain the cylinder block as shown.

Fig 2: Identifying Cylinder Block Drain Plug
Courtesy of SUZUKI OF AMERICA CORP.
Remove the reservoir tank to drain the engine coolant, then clean the reservoir tank before installing it.
Check the drained coolant for contaminants such as rust, corrosion or discoloration. If the coolant is contaminated, flush the engine cooling system. Follow the "Flushing Cooling System" procedure.