Four Seasons 74000 HVAC Heater Control Valve
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Four Seasons
 Heater Valve

Four Seasons 74000 HVAC Heater Control Valve

Brand Four Seasons 74000
Bypass? No
Description Cable Operated Pull to Close Non-Bypass Heater Valve
Hose Connector Quantity 2 Connectors
Material Plastic
O.E. Replacement? Yes
Opening B IN 0.625
Opening IN 0.625
Operation Type Cable
Style Non-Bypass
Type Heater Valves
Product line Heater Valve
Fits Honda · 3 vehicles

OE replacement. Cable-operated heater valve for straightforward installation.

Non-bypass design. Helps control coolant flow without routing it around the valve.

Plastic construction. Lightweight material with two hose connectors for a clean fit.

Cross-references Carlson H849, Four Seasons 74000 and 39270SF0003 for the same application. See all 6.

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Four Seasons 74000 Heater Valve for Honda Prelude

The Four Seasons Heater Valve 74000 is an OE replacement HVAC heater control valve built for cable-operated temperature control systems. It uses a pull-to-close, non-bypass design with two hose connectors and 0.625 in. openings for direct-fit service on select Honda applications.

Fits 1985-1987 Honda Prelude, heater valve.

Key Features

  • Brand: Four Seasons Heater Valve line
  • Part number: 74000
  • Cable-operated heater control valve
  • Pull to close, non-bypass style
  • Plastic construction
  • Two hose connectors
  • 0.625 in. opening size
  • OE replacement design

Product Details

Four Seasons 74000 is an HVAC heater control valve for cable-actuated heating systems. As a non-bypass valve, it regulates coolant flow through the heater circuit rather than routing flow around the heater core. This makes it a direct service part for restoring cabin heat control on 1985-1987 Honda Prelude models. This part cross-references Carlson H849 for the same application.

Common Issues It Can Help Resolve

  • Heater output stuck on hot or cold
  • Broken or seized cable-operated valve movement
  • Coolant flow control problems in the heater circuit
  • Loss of cabin temperature adjustment
  • Leakage at the heater valve body or hose connections

Installation Notes

Verify hose routing, connector size, and cable travel before installation. Match the valve style to the original non-bypass configuration and confirm the 0.625 in. openings align with the vehicle’s heater hoses. After installation, check for proper cable operation and inspect the cooling system for leaks and correct heater performance.

Quality Assurance

Four Seasons Heater Valve components are built as OE replacement parts for HVAC temperature control service. Part number 74000 is specified for select Honda Prelude applications and follows the original cable-operated, non-bypass design.

Related reading

This part fits 3 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
1987HondaPreludeN/AHeater Valve
1986HondaPreludeN/AHeater Valve
1985HondaPreludeN/AHeater Valve
Directly replaces or cross-references 6 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Carlson — H849Four Seasons — 7400039270SF000320846811174000H74000