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Four Seasons 74946 HVAC Heater Control Valve
| Brand | Four Seasons 74946 |
|---|---|
| Bypass? | Yes |
| Description | Rotary electronic heater valve |
| Material | Plastic |
| Number of Connectors | 3 connectors |
| Opening B IN | 0.78 |
| Opening C IN | 0.78 |
| Opening IN | 0.78 |
| Operation Type | Motor actuated |
| Style | Bypass |
| Terminal Pin Qty. | 6 |
| Type | Heater valves |
| Product line | Heater Valve |
| Fits | Ram · 5 vehicles |
Motor actuated. Rotary electronic heater valve for precise coolant flow control.
Bypass style. Helps regulate heater circuit flow with a bypass design.
Plastic construction. Lightweight material suited for HVAC temperature control service.
Cross-references Four Seasons 74946, 52014971AA and 52014971AB for the same application. See all 3.
Four Seasons 74946 Heater Valve Overview
The Four Seasons 74946 heater valve is a motor-actuated rotary electronic heater valve built for HVAC temperature control in select Ram trucks. It uses a bypass-style design with a plastic body and three connectors to regulate coolant flow through the heater circuit.
Compatible With 2015-2018 Ram 1500 and 2019 Ram 1500 Classic, this HVAC heater control valve is a direct-fit service part for vehicles that need precise heater flow control. Four Seasons backs the Heater Valve line with more than 50 years of mobile A/C experience and product testing focused on long-term operation.
Key Features
- Part number 74946
- Rotary electronic heater valve with motor-actuated operation
- Bypass style design for heater circuit flow control
- Plastic construction
- Three connectors and 6 terminal pins
- Opening size: 0.78 in.
- Four Seasons Heater Valve product line
Product Details
Four Seasons 74946 is an HVAC heater control valve engineered for Ram 1500 and Ram 1500 Classic applications that require electronic coolant flow management. The bypass configuration helps route heater coolant as commanded by the vehicle’s HVAC system, supporting consistent cabin temperature control. This part cross-references Mopar 52014971AA and 52014971AB for the same application.
The Four Seasons Heater Valve line focuses on tested replacement components for mobile air conditioning and heating systems. If you are replacing a worn or malfunctioning heater valve on a 2015-2018 Ram 1500 or a 2019 Ram 1500 Classic, part number 74946 provides the correct fitment and connector layout for those applications.
What It Helps Fix
- Inconsistent heat output from the HVAC system
- Coolant flow problems through the heater circuit
- Heater valve electrical control faults
- Temperature changes that do not match HVAC commands
- Leakage or sticking in the heater control valve assembly
Installation Notes
Verify connector count, terminal pin layout, and opening size before installation. Confirm the vehicle’s HVAC system uses a motor-actuated bypass heater valve and match the replacement to the original routing and connector style. For best results, compare the old valve to Four Seasons 74946 before installation on Ram 1500 or Ram 1500 Classic models.
Quality Assurance
Four Seasons states that its products are engineered and tested for years of trouble-free operation. The Heater Valve line is supported by the brand’s long history in mobile A/C and HVAC components, with a focus on reliable replacement performance.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2019 | Ram | 1500 Classic | 3.0L | V6 | N/A | Heater Valve |
| 2018 | Ram | 1500 | 3.0L | V6 | N/A | Heater Valve |
| 2017 | Ram | 1500 | 3.0L | V6 | N/A | Heater Valve |
| 2016 | Ram | 1500 | 3.0L | V6 | N/A | Heater Valve |
| 2015 | Ram | 1500 | 3.0L | V6 | N/A | Heater Valve |
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