Heater Core Backflush Tool & Flush Gun – Adjustable Water & Air Pressure, Garden Hose Connection, 1/2", 5/8" & 3/4" Heater Hose Adapter

Restore cabin heat and improve coolant flow with the Milton® Heater Core Backflush Tool, designed to help technicians and DIYers remove rust, scale, sludge, and other debris that can restrict flow through a vehicle's heater core. This heater core flush tool provides a controlled method for tackling clogged heater cores and restricted coolant passages without immediately resorting to heater core replacement.

Unlike conventional flushing that follows the normal direction of coolant flow and may push accumulated debris deeper into the heater core, the Milton® heater core flushing tool reverses the direction of flow. Water or cleaning solution is forced through the heater core opposite the normal coolant flow, helping push contaminants back out the way they entered for more effective blockage removal.

For stubborn clogs and heavier buildup, compressed air can be used to assist the flushing process and create an agitating effect, providing an additional level of cleaning power. This water and air capability makes the tool a versatile solution for dislodging rust, scale, sludge, and debris that can contribute to poor heater performance and restricted coolant flow.

An integrated control knob provides adjustable pressure, allowing users to regulate water pressure based on the application. This controlled approach provides effective flushing power while helping reduce the risk of excessive pressure that could damage sensitive heater core components.

Designed for convenient automotive shop and garage use, the spray handle connects directly to a standard garden hose. The included stepped, multi-size hose adapter accommodates 1/2", 5/8", and 3/4" heater hoses, providing greater compatibility across vehicle applications without requiring multiple specialty adapters.

Whether you're troubleshooting poor cabin heat, servicing a clogged heater core, or performing cooling-system maintenance, the Milton® Heater Core Backflush Tool provides a straightforward and controlled way to flush contaminants and help restore heater core flow and performance.

Ideal Applications

The Milton® Heater Core Backflush Tool is designed for professional automotive technicians, repair shops, fleet maintenance operations, and DIY users dealing with poor cabin heat, restricted heater core flow, coolant passage buildup, or clogged heater cores.

Ideal for heater core maintenance and automotive cooling-system service, the tool combines reverse-flow cleaning, adjustable pressure, water and compressed-air capability, and multi-size heater hose compatibility in one convenient solution.