Four Seasons 74853 HVAC Heater Control Valve - Front
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Four Seasons
 Heater Valve

Four Seasons 74853 HVAC Heater Control Valve - Front

Brand Four Seasons 74853
Position Front
Bypass? Yes
Description Vacuum Open Bypass Heater Valve
Hose Connector Quantity 4 Connectors
Material Plastic
O.E. Replacement? Yes
Opening B IN 0.625
Opening B MM 15.875
Opening C IN 0.625
Opening C MM 15.875
Opening D IN 0.625
Opening D MM 15.875
Opening E IN 0.750
Opening E MM 19.050
Opening IN 0.625
Opening MM 15.875
Operation Type Vacuum
Style Bypass
Type Heater Valves
Product line Heater Valve
Fits Chevrolet and GMC · 20 vehicles

OE replacement. Direct-fit heater valve for straightforward installation.

Vacuum open bypass. Uses vacuum operation for reliable coolant flow control.

Plastic construction. Lightweight material resists corrosion in the HVAC system.

Cross-references Four Seasons 74853, Global Parts Distributors LLC 8211326 and Hayden 5963 for the same application. See all 11.

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Four Seasons 74853 Heater Control Valve

Four Seasons 74853 is a vacuum open bypass heater valve for HVAC temperature control systems. It is an OE replacement heater valve with a plastic body, four hose connectors, and bypass operation for direct service on select Chevrolet Astro and GMC Safari front heater applications.

Key Features

  • Vacuum open bypass heater valve for HVAC temperature control
  • OE replacement design for factory-style service
  • Plastic construction
  • Four hose connectors
  • Bypass style with vacuum operation
  • Opening sizes include 0.625 in. (15.875 mm) and 0.750 in. (19.050 mm)

Product Details

This Four Seasons Heater Valve line focuses on temperature control components that match original equipment function and fit. Part number 74853 is a vacuum-operated bypass heater control valve used in front HVAC systems on 1996-2005 Chevrolet Astro and 1996-2005 GMC Safari models with a 6-port hose connection. This part cross-references Hayden 5963 for the same application.

Compatible With 1996-2005 Chevrolet Astro, front, and 1996-2005 GMC Safari, front. If your vehicle uses a 6-port hose connection and the heater circuit is not routing coolant correctly, Four Seasons 74853 provides the correct valve style for service replacement.

Common Repair Symptoms

  • No heat or inconsistent cabin heat
  • Coolant flow not switching properly through the heater circuit
  • Vacuum-controlled heater valve not opening or closing as commanded
  • Leaking or cracked plastic heater valve housing
  • HVAC temperature changes that do not match control input

Installation Notes

Verify hose routing, connector count, and opening sizes before installation. This valve is specified as a vacuum open bypass style, so confirm the vehicle’s HVAC control strategy and hose layout match the original part. Inspect adjacent heater hoses and vacuum lines for wear, since a new valve will not correct damaged plumbing or control issues elsewhere in the system.

Quality Assurance

Four Seasons supplies OE replacement HVAC components for temperature control service. Part number 74853 is built to match the original valve style and application details for direct-fit replacement on listed Astro and Safari models.

Related reading

This part fits 20 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2005ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
2005GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
2004ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
2004GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
2003ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
2003GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
2002ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
2002GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
2001ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
2001GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
2000ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
2000GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
1999ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
1999GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
1998ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
1998GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
1997ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
1997GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
1996ChevroletAstroFrontw/ 6-Port Hose Connection; Heater Valve
1996GMCSafariFrontw/ 6-Port Hose Connection; Heater Valve
Directly replaces or cross-references 11 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 74853Global Parts Distributors LLC — 8211326Hayden — 596315555180180166013211117485315984154CWK801801H599H77596