Dayco Heater Tap DHV5631 Ultra-Performance Enviro+ EU is a premium

Enviro+ EU is a premium full synthetic

Bypass thermostat with jiggle pin integrated into housing

Original Equipment Manufacturer (OEM) warranty

Its uses a technically advanced hybrid (HOAT - Hybrid Organic Acid Technology) inhibitor formulation which provides a stable long life coolant that prevents rust

Foam Filter Oil is a mineral solvent based

Dayco Heater Tap DHV5631 Ultra-Performance Enviro+ EU is a premiumThe purpose of the Heater Control Valve is to regulate the flow of coolant to the heater core. In the off position, the heater valve blocks coolant flow to the heater core, hence when no heating is required, and the reverse when heating inside the vehicle is needed. The heater valve can be activated by vacuum control in late model vehicles and cable in earlier models. Common failures include leakage, blocking and, because most late model valves are