GM Genuine Parts HVAC Heater Bypass Valves are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These bypass valves are control valves for the flow of coolant through the heater core. When the heater valve is closed, the bypass valve diverts the coolant flow back to the engine. The valve maintains coolant flow through the thermostat housing to ensure correct operation of the thermostat. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

• Restores cooling system function and performance
• Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
• GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
• Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type
• GM regularly updates production and service part designs to integrate new materials and technologies

Height (in):	4.03
Length:	3.9
Length:	98.8
Meets or Exceeds Original Equipment Manufacture Specifications:	Yes
Mount Hole Diameter (mm):	7.25mm
Mount Hole Quantity:	2
Port Quantity:	4
Programming Required:	No
Weight (lb):	0.34
Width (in):	4.03

• 1996-2005 Chevrolet Astro
• 1996-2005 GMC Safari