Best Heater Fan Relay Options for Vehicle and HVAC Systems

Choosing the right heater fan relay matters whether you’re replacing an automotive fan relay or an HVAC blower relay. Below is a concise comparison of reliable replacement relays and compatible options for both vehicles and home systems to help narrow choices.

Product	Type / Use	Key Feature
Aeola 90987-02025 Compatible Relay	Automotive Engine Cooling / Heater Fan	OEM Cross-Reference Part Numbers
Carsloong G8HN-H70 2 Pack	Automotive Rear Window Defrost / Heater Fan	Direct Replacement For Honda / Acura
MZPYBC G8HN-H70 4 pcs	Automotive Rear Defroster / Heater Fan	4-Pack For Multiple Replacements
Dreyoo 24V Fan Relay (90-980)	HVAC / Furnace / Blower	24VAC Coil, UL Certified, 12 FLA
LVACODV APFR-360 24V AC Heavy-Duty Relay	Universal HVAC Fan Relay / Heat Sequencer	Universal Bracket, High FLA/LRA Ratings

Aeola 90987-02025 Compatible Heater Cooling Fan Relay

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This Aeola relay is offered as a replacement for a broad set of OEM part numbers, designed primarily for engine cooling fan motors and related heater/ignition circuits on compatible Toyota and Lexus models. The listing emphasizes cross-reference compatibility with several common part numbers including 90987-02025 and 90080-87024.

• Compatibility: Lists many OEM cross-reference numbers to match factory relays.
• Construction: Noted as TOP quality relays built from durable materials intended to meet OEM standards.
• Use Case: Replacement for cooling fan / heater fan circuits where these OEM numbers apply.

For technicians and DIYers working on compatible vehicles, this relay is targeted as a direct-fit replacement based on part number matching. Verify the OEM number in the vehicle’s service manual or on the existing relay before purchase.

Carsloong G8HN-H70 2 Pack Rear Defroster Heater Fan Relay

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The Carsloong G8HN-H70 is positioned as an OEM-style relay suitable for Honda and Acura rear window defroster and heater fan circuits. Sold in a two-pack, the relay is promoted for ease of replacement and direct-fit installation.

• OEM Part Number: G8HN-H70 / 39792-SDA-A01 compatibility mentioned.
• Design: Direct replacement form factor intended to match original relay socket and terminals.
• Durability: Made from high-quality materials intended for long-lasting service life.

This two-pack is useful for owners of Honda/Acura vehicles where the OEM G8HN-H70 is used. Matching the part number and terminal arrangement is essential to confirm fitment.

MZPYBC 4-Pack Relay G8HN-H70 Rear Heater Fan

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The MZPYBC offering provides four G8HN-H70 relays, covering models that use the 12V coil SPST relay for rear defroster or heater fan control. This multi-pack suits fleet vehicles, multiple repairs, or spare stocking.

• Pack Size: Four relays included for multiple replacements or spares.
• Electrical: 12V coil, SPST normally open contacts suited for typical car defroster/fan circuits.
• Fitment Notes: Lists common OEM variants to help match to vehicle application.

For workshops or owners preferring batch replacements or keeping spares on hand, a four-pack can be efficient. Ensure terminal layout and mounting match the vehicle’s relay socket.

Dreyoo 24V Fan Relay 90-980 For Goodman HVAC Blowers

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The Dreyoo 90-980 type relay is a 24VAC coil isolation relay suited for HVAC applications including furnace blowers, humidifier blowers, and heat sequencers. It’s UL certified and rated for common blower motor loads (12 FLA), making it appropriate for many residential systems.

• Electrical Rating: 24VAC coil, 12 FLA rated switching capacity.
• Applications: Goodman blowers, HVAC air handlers, gas furnace blower control, and other fan control uses.
• Certification: UL certification noted for safety and reliability in HVAC systems.

This relay is intended for HVAC technicians and homeowners working on compatible furnace or blower systems. Confirm the coil voltage and FLA/LRA ratings align with your blower motor specifications before installation.

LVACODV APFR-360 24V AC Heavy-Duty Fan Relay

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The APFR-360 is a universal 24VAC single-pole SPST fan relay designed for a wide range of HVAC systems. It includes a universal bracket for mounting and lists substantial FLA/LRA and resistive ratings, making it suitable for heavier blower loads and heat sequencer roles.

• Ratings: 12 FLA / 84 LRA at 125 VAC, 8 FLA / 48 LRA at 250 VAC, 25A resistive at 277 VAC.
• Versatility: Suitable for heating, air conditioning, refrigeration, and ventilation when electrical specs match.
• Mounting: Supplied bracket simplifies installation in many control boxes.

This relay is aimed at professionals who need a robust, universal switching relay that can handle heavier starting currents in blower motors. Confirm load and inrush current requirements when selecting.

Buying Guide: How To Choose The Right Heater Fan Relay

Selecting the correct heater fan relay requires attention to several technical and practical factors. Below are core considerations to compare options effectively.

Match The Coil Voltage

Confirm the relay coil voltage exactly matches your system. Automotive relays typically use 12V DC coils, while HVAC relays commonly use 24VAC. Installing the wrong coil voltage prevents operation and can damage the relay.

Load Ratings: FLA, LRA, And Resistive Current

Relay contacts must handle both the running current (FLA) and the motor’s starting/inrush current (LRA). Choose a relay with adequate FLA and LRA ratings for the blower motor to avoid overheating or welding of contacts.

Contact Configuration And Pinout

Confirm the relay’s contact arrangement (SPST, SPDT) and the physical pinout match the socket or wiring harness in the vehicle or equipment. OEM cross-reference numbers or a pinout diagram help ensure proper interchangeability.

Environmental And Durability Requirements

Consider operating environment: automotive relays may face higher vibration and temperature extremes, while HVAC relays may need certifications like UL. Choose relays built from materials appropriate for the intended environment.

Compatibility And OEM Cross-Reference

For vehicles, matching OEM part numbers (or acceptable cross-references) is the most reliable method. The Aeola listing provides many cross-reference numbers, while G8HN-H70 is a common Honda/Acura reference. Verify numbers on the existing relay or in the service manual.

Pack Size And Service Logistics

Consider whether a single replacement or a multi-pack better suits your needs. Multi-packs (like the MZPYBC 4-pack) are useful for fleet maintenance or stocking spares. Single units may be sufficient for one-off repairs.

Mounting And Form Factor

For HVAC control boards, mounting brackets and relay footprint matter. Products like the LVACODV APFR-360 include a universal bracket. For plug-in automotive relays, ensure the housing and tab positions match the relay socket.

Certifications And Safety

Where applicable, prioritize relays with safety certifications (UL, CE) for HVAC and home appliances. Certified components reduce risk and are often required by code in professional installations.

Serviceability And Replacement Strategy

Plan for accessibility of the relay in the equipment. In vehicles, relays are often in fuse/relay boxes; in HVAC units, they may be on control panels. Choose a relay type that can be easily swapped during routine maintenance.

Comparing Automotive Versus HVAC Relays

Automotive relays are typically 12V DC rated and designed for vehicular environments. HVAC relays are usually 24VAC coils with higher alternating current switching ratings and may include brackets or isolation features for control circuits. Match the category to the application to ensure proper performance.

Installation And Wiring Best Practices

• Disconnect power or the vehicle battery before replacing relays.
• Label wires or photograph the existing connections before removal.
• Use matching gauge wiring and proper terminal connectors for high-current paths.
• Verify operation after installation and inspect for heat buildup during initial run.

When To Upgrade To A Higher-Rated Relay

If replacing a relay on a system with an upgraded motor or add-on accessories, choose a relay with higher FLA/LRA ratings to handle increased load and inrush. Consider solid-state relay modules or relays with dedicated heat sinks for high-duty applications.

Cost, Availability, And OEM Versus Aftermarket

OEM relays provide direct-fit assurance but aftermarket relays can offer wider availability and varied pack sizes. Always verify spec sheets and part cross-references when opting for aftermarket replacements.

Use the checklist above to confirm coil voltage, contact ratings, pinout, environmental suitability, and certification before selecting the best heater fan relay for your vehicle or HVAC system.