How do I change the coolant in the Coolmate 4?

Disconnect the cooler plug from the welding power source receptacle. Drain coolant by tipping the unit forward. Fill with clean water and run for 10 minutes, then drain and refill with the selected coolant. Dispose of used coolant according to national, state, and local codes—do not pour down the drain. If replacing hoses, use hoses compatible with ethylene glycol such as Buna-n, Neoprene, or Hypalon (oxy-acetylene hoses are not compatible).