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Four Seasons 74006 HVAC Heater Control Valve
| Brand | Four Seasons 74006 |
|---|---|
| Bypass? | No |
| Description | Vacuum Closes 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 | Acura · 4 vehicles |
OE replacement. Direct-fit heater valve for straightforward installation.
Vacuum closes. Non-bypass design helps control coolant flow reliably.
Plastic construction. Lightweight material resists corrosion in HVAC service.
Cross-references Carlson H862, Four Seasons 74006 and 79710SW5A01 for the same application. See all 11.
Four Seasons 74006 Heater Valve Overview
The Four Seasons Heater Valve 74006 is an OE replacement HVAC heater control valve for vehicles that use cable operation and a non-bypass design. It is built with a plastic body, two hose connectors, and a 0.625 in. opening for direct service on the heater circuit. This part fits 1995-1998 Acura TL heater valve applications.
Key Features
- Four Seasons Heater Valve line for HVAC temperature control service
- Part number 74006 for direct identification and ordering
- Vacuum closes non-bypass heater valve design
- Cable-operated valve with non-bypass style
- Plastic construction with 2 hose connectors
- 0.625 in. opening and 0.625 in. opening B specification
- OE replacement fitment for 1995-1998 Acura TL heater valve applications
Detailed Product Description
Four Seasons 74006 is an HVAC heater control valve used to regulate coolant flow through the heater core in vehicles equipped with a cable-operated, non-bypass system. The valve’s vacuum-closing function and 0.625 in. hose opening support proper heater circuit control, while the plastic housing and two-connector layout match OE-style service requirements. For Acura TL owners searching for a 1995-1998 Acura TL heater valve or a Four Seasons 74006 replacement heater valve, this part provides a direct-match service option.
This part cross-references Carlson H862 for the same application.
Common Problems This Part Can Address
- Heater output stuck on hot or cold due to a failed control valve
- Coolant flow not changing when the temperature control is moved
- Vacuum-closing heater valve leakage or internal wear
- Broken or deteriorated plastic valve body at the heater hose connection
- Incorrect heater core coolant routing in a cable-operated HVAC system
Installation Notes and Tips
Verify hose size, connector count, and valve style before installation. Confirm the vehicle uses a cable-operated, non-bypass heater valve and match the 0.625 in. opening to the existing heater hose configuration. Inspect the heater hoses, clamps, and coolant condition during service, and bleed the cooling system after replacement to restore normal heater performance.
Quality Assurance
Four Seasons markets this part as an OE replacement heater valve, built to match the original application requirements for fit and function in supported vehicles.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1998 | Acura | TL | 2.5L | L5 | N/A | Heater Valve |
| 1997 | Acura | TL | 2.5L | L5 | N/A | Heater Valve |
| 1996 | Acura | TL | 2.5L | L5 | N/A | Heater Valve |
| 1995 | Acura | TL | — | — | N/A | Heater Valve |
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