3679-7825
90-Degree Heater Shut-Off Valve
Mack

This 90-degree heater shut-off valve is designed to control the flow of coolant to the heater circuit with compact, space-saving geometry. The 90-degree orientation enables installation in tight engine compartments or routed piping paths where straight valves would be impractical. By providing a reliable on/off control, it helps maintain passenger comfort through precise temperature regulation and minimizes unnecessary heat loss when the heater is not required. Robust construction stands up to vibration, temperature fluctuations, and road debris, while precise sealing reduces the risk of leaks that could impact system performance. For maintenance, verify valve operation with a functional test and ensure seals and connections are secure during replacement. The part contributes to overall climate control reliability and efficient coolant management in heavy-duty applications. Source One Parts Center.