Quality coolant and water are critical to water pump operation. Contaminated coolant, depleted coolant, and poor water quality can result in corrosion and seal damage. Water quality varies greatly in different areas. Unclean water also leaves mineral deposits in the cooling system, which can reduce coolant flow.
Engine coolants come in various colours and formulations, ranging from conventional green coolants to a variety of long-life coolants that may be orange, red, gold or blue. The colour is mainly a dye, but the chemistry of the coolants is different.
Vehicle manufacturers have different coolant requirements and there may be some confusion over which type of coolant to use in a vehicle. Check the manufacturer’s service information for the correct coolant for the vehicle being serviced. Most manufacturers do not recommend mixing long-life coolant and conventional coolant.
When replacing a water pump, it’s critical to flush the cooling system. Prior to performing the flush procedure, remove, clean and reinstall the coolant recovery reservoir. To flush the system, use power flush equipment or thermal cycle the system with clean water three times. The most effective method of flushing the cooling system is to use a coolant exchanger. Follow the manufacturer's operating instructions. A coolant exchanger can replace virtually all of the old coolant with new coolant without spillage and offers easy waste collection.