Choosing the right heater blower relay is essential for reliable fan control in vehicles and HVAC systems. The table below summarizes five top replacement relays selected for compatibility, durability, and common applications. Read the product sections and the buying guide to compare specs, mounting types, and coil voltages before purchasing.
| Product | Brand | Key Feature |
|---|---|---|
| ACDelco 15-50961 Auxiliary Blower Relay | ACDelco | Professional aftermarket replacement, OE fit |
| APFR-360 24V AC Heavy-Duty Fan Relay | LVACODV | 24VAC coil, heavy-duty ratings for HVAC |
| HVAC Blower Motor Resistor & Relay 4720278 | TVM TRAVERMAN | Integrated resistor and relay for Dodge/Jeep |
| Heater Blower Relay 90987-04002 5-Pin | FTHSO | 5-pin 12V plug-in relay for Toyota/Lexus |
| Dreyoo 90-980 24V Fan Relay | Dreyoo | UL certified, compatible with Goodman blowers |
Content Navigation
- ACDelco Auxiliary Blower Relay
- APFR-360 24V Heavy-Duty Relay
- HVAC Blower Resistor With Relay 4720278
- 5-Pin Heater Blower Relay 90987-04002
- Dreyoo 90-980 24V Fan Relay
- Buying Guide: How To Choose A Heater Blower Relay
- 1. Coil Voltage And Control Type
- 2. Contact Ratings And Motor Load
- 3. Pole Configuration And Contact Type
- 4. Form Factor And Mounting
- 5. Environmental Durability
- 6. Compatibility With OEM Part Numbers
- 7. Safety Certifications And Standards
- 8. Integrated Modules Versus Standalone Relays
- 9. Wiring And Terminal Identification
- 10. Load Type: Resistive Vs Inductive
- 11. Longevity And Replaceability
- 12. Price And Availability Perspective
- 13. Diagnostic And Troubleshooting Considerations
- 14. Comparison Summary
ACDelco Auxiliary Blower Relay
This ACDelco Professional 15-50961 relay is marketed as a premium aftermarket replacement designed to provide the performance and dependability associated with the brand. The unit is manufactured to meet expectations for fit, form, and function, making it suitable for direct replacement applications where the original relay is failing.
Features referenced include a professional construction and premium aftermarket positioning. Its intended role is to serve as an auxiliary heating and air conditioning blower motor relay. Compatibility should be confirmed against vehicle or equipment OEM part numbers and terminal layouts prior to installation.
APFR-360 24V Heavy-Duty Relay
The APFR-360 is a 24VAC heavy-duty fan relay intended for HVAC systems, humidifiers, and blower controls. It includes a universal bracket for mounting and is specified as a Single Pole SPST isolated AC switch. Terminal designations separate coil and load connections for clear wiring.
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Key electrical ratings: 12 FLA / 84 LRA at 125 VAC, 8 FLA / 48 LRA at 250 VAC, and 25A at 277 VAC resistive. The relay is suitable where the specified electrical requirements are met, providing high-current switching for blower motors and similar loads.
HVAC Blower Resistor With Relay 4720278
This combined blower motor resistor and relay module is listed as compatible with a range of Dodge Ram and Jeep Grand Cherokee models from the 1990s through the 2000s. The integrated design houses resistors and relays to control blower motor speed and restore multi-gear fan operation.
Features highlight compatibility with OEM part numbers such as 4720278 and replacements for several listed part numbers. The product is described as addressing common blower faults including fan failure to rotate and loss of multiple fan speeds, by replacing the speed control module assembly.
5-Pin Heater Blower Relay 90987-04002
The FTHSO 90987-04002 relay is a plug-in 5-pin 12V DC unit commonly listed as compatible with Toyota and Lexus models including Camry, Corolla, Highlander, RAV4, and Avalon. The compact dimensions and 5-pin connector design match many OEM relay sockets.
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Listed uses include air conditioning relay, heater blower motor relay, fuel pump and AC compressor switching. The product description emphasizes plug-in compatibility and typical automotive relay roles. Verify pin configuration and connector style against the vehicle harness before purchase.
Dreyoo 90-980 24V Fan Relay
The Dreyoo 90-980 is a 24VAC isolation relay commonly used as a replacement part for Goodman HVAC systems, furnaces, humidifiers, and blower controls. It is rated as 12 FLA and offers UL certification for safety and performance.
Feature highlights include wide application compatibility for blower and fan control, UL certification, and an SPST single-pole switching arrangement. The relay serves as an isolation device between control circuits and blower motor power supplies in heating and cooling equipment.
Buying Guide: How To Choose A Heater Blower Relay
Selecting the right relay requires matching electrical, mechanical, and environmental characteristics to your application. Below are key considerations across multiple comparison perspectives to help determine which relay fits your vehicle or HVAC system.
1. Coil Voltage And Control Type
Confirm the coil voltage used by the control circuit. Common coil voltages are 12V DC for automotive relays and 24V AC for HVAC systems. Using a relay with the incorrect coil voltage will prevent operation and may damage the control circuit.
2. Contact Ratings And Motor Load
Relays are rated for continuous and inrush currents. Blower motors have high starting currents (Locked Rotor Amps, LRA) and full-load amps (FLA). Choose a relay with sufficient ratings for both FLA and LRA at the system voltage (e.g., 125 VAC, 250 VAC, 277 VAC).
3. Pole Configuration And Contact Type
Most blower relays are SPST or SPDT. Ensure the required switching behavior (normally open or normally closed) matches the control logic. Isolated contacts are preferable to prevent interference between control circuits and motor power.
4. Form Factor And Mounting
Automotive relays are often plug-in 4- or 5-pin modules that match OE sockets. HVAC relays may be PCB-mount or bracket-mounted. Confirm physical dimensions, connector style, and whether a mounting bracket is included for secure installation.
5. Environmental Durability
Consider heat dissipation, waterproofing, and vibration resistance. For engine-compartment or outdoor HVAC locations, thermal management and sealed enclosures extend service life. Products that note heat dissipation or rapid cooling can reduce thermal stress on contacts.
6. Compatibility With OEM Part Numbers
If replacing an existing component, match OEM part numbers or cross-reference part lists. Modules that list compatible part numbers (resistor/relay assemblies) simplify identification for vehicle-specific replacements.
7. Safety Certifications And Standards
UL certification and recognized electrical ratings ensure compliance with safety standards, especially for HVAC equipment. Certified relays provide documented testing for insulation, endurance, and temperature performance.
8. Integrated Modules Versus Standalone Relays
Some applications use integrated resistor/relay modules to control speed steps (common in vehicle HVAC). Integrated assemblies replace multiple components at once, while standalone relays are suitable for simple on/off blower control. Consider repair scope and whether the fault involves resistors, relays, or wiring.
9. Wiring And Terminal Identification
Clear terminal labeling and documented terminal assignments simplify installation. For HVAC relays, terminal numbers often separate coil and power terminals (e.g., terminals 1-3 for coil, 2-4 for load). Confirm wiring diagrams before replacing to avoid miswiring.
10. Load Type: Resistive Vs Inductive
Blower motors are inductive loads with higher inrush currents; ensure the relay’s ratings explicitly list inductive (motor) ratings or LRA to handle starting currents. Some relays state resistive amperage only—this is insufficient for motor loads without additional spec for LRA.
11. Longevity And Replaceability
Consider how easy it will be to replace the relay in the future. Plug-in relays and modules that match OE footprints reduce labor time. For critical systems, choose relays with higher rated cycles and proven thermal management to increase service intervals.
12. Price And Availability Perspective
While price is a factor, prioritize correct specifications and compatibility. For legacy vehicles, OEM-style or matched aftermarket parts may offer better long-term reliability despite higher initial cost. For generic HVAC replacement, universal heavy-duty relays can be cost-effective if ratings match.
13. Diagnostic And Troubleshooting Considerations
If a blower is inoperative, inspect fuses, wiring, resistor packs, control switches, and the relay socket. Relays can fail mechanically or electrically; test coil continuity and contact switching where possible. Replacing the relay or integrated module can resolve faults tied to intermittent switching or failed contacts.
14. Comparison Summary
- Vehicle-Specific Needs: Choose OE-form relays or integrated resistor/relay modules that list compatible part numbers.
- HVAC Systems: Select 24VAC relays with documented FLA/LRA ratings and UL listing for code compliance.
- Universal Replacement: Heavy-duty SPST 24VAC relays with mounting brackets fit many blower applications when electrical ratings match.
By verifying coil voltage, contact ratings, mounting type, and compatibility with OEM part numbers or wiring diagrams, you can select a heater blower relay suited to your vehicle or HVAC needs. Objectively compare the specifications and certifications against your application requirements to ensure safe and reliable operation.
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