Blower motor relays often cause noisy or unreliable HVAC fans more than resistors do.
A durable relay that fits correctly prevents corrosion, heat failure, and vibration-related faults. This guide highlights five relays chosen for OEM compatibility, sealed contacts, and long-term durability.
I’ll also note which cars each relay suits and what to check during replacement for a quiet, long-lasting blower.
| ACDelco Gold Auxiliary HVAC Blower Motor Relay |
| Professional Grade | Purpose: Blower motor / HVAC relay | Vehicle application: Automotive HVAC systems (ACDelco/GM fit) | Contact type: Normally Open | VIEW LATEST PRICE | Read Our Analysis |
| Blower Motor Relay Compatible with Infiniti & Nissan |
| Perfect Fit | Purpose: Blower motor relay | Vehicle application: Nissan / Infiniti models (listed: Altima, Sentra, Maxima, G35, G37, etc.) | Contact type: Normally Open | VIEW LATEST PRICE | Read Our Analysis |
| AC Starter Relay Assembly Conversion Kit for Honda |
| Versatile Upgrade | Purpose: A/C fan / blower motor relay (multi-use conversion kit) | Vehicle application: Honda / Acura models (Accord, Civic, CR‑V, Odyssey, MDX, etc.) | Contact type: Normally Open | VIEW LATEST PRICE | Read Our Analysis |
| Blower Motor Relay Compatible with Nissan Infiniti Models |
| Wide Compatibility | Purpose: Blower motor relay | Vehicle application: Nissan / Infiniti models (extensive list of makes/years) | Contact type: Normally Open | VIEW LATEST PRICE | Read Our Analysis |
| GM Genuine Parts 13500114 Multi-Purpose Relay |
| OEM Replacement | Purpose: Multi-purpose relay (used for blower motor among other OEM roles) | Vehicle application: GM vehicles (OE replacement for GM applications) | Contact type: (Implied) Normally Open / standard relay contact (multi-purpose OE relay) | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
ACDelco Gold Auxiliary HVAC Blower Motor Relay
Should you want a dependable replacement that fits and works like the original, the ACDelco Gold 15-50961 auxiliary HVAC blower motor relay is a strong choice because it’s built to professional standards and designed for direct fit in many systems. You’ll like that it’s made for 12 volt systems, has three terminals, and mounts with a press in style for easy installation. It meets IP67 and UL standards, so you can trust its durability. You’ll feel reassured of Gold series quality and the match to OEM 19189419 specifications, with light weight and compact dimensions for tight spaces.
- Purpose:Blower motor / HVAC relay
- Vehicle application:Automotive HVAC systems (ACDelco/GM fit)
- Contact type:Normally Open
- Coil voltage:12 V DC
- Replacement / OEM fit:ACDelco Gold premium aftermarket to match OE (OEM PN 19189419)
- Connector / mounting type:Through‑hole / press‑in mount
- Additional Feature:ACDelco Gold series
- Additional Feature:IP67 rated protection
- Additional Feature:144 milliwatts wattage
Blower Motor Relay Compatible with Infiniti & Nissan
Should you own an Infiniti or Nissan and want a hassle free replacement that fits and works like the original, this blower motor relay is an excellent choice because it matches factory specifications and bolts in without modification. You’ll get part 25230-79942, which replaces OEM 25230-79942 and 25230-79943, so compatibility worries fade. It fits Infiniti G35, M35, G37 and many Nissan models like Altima, Sentra, Maxima, Murano, Rogue, Titan, Juke, Quest, Leaf, Armada. Built to OEM standards, it offers durable performance. Installation is straightforward for both mechanics and DIYers, and the precise fit keeps things simple and reliable.
- Purpose:Blower motor relay
- Vehicle application:Nissan / Infiniti models (listed: Altima, Sentra, Maxima, G35, G37, etc.)
- Contact type:Normally Open
- Coil voltage:12 V (built to OEM vehicle electrical specs)
- Replacement / OEM fit:Direct replacement for OEM 25230‑79942 / 25230‑79943
- Connector / mounting type:Plug‑in (direct vehicle connector)
- Additional Feature:OEM-spec construction
- Additional Feature:Direct vehicle fit
- Additional Feature:Single-pack replacement
AC Starter Relay Assembly Conversion Kit for Honda
In case you want a reliable way to restore multi speed AC blower function in many Honda and Acura models, this AC Starter Relay Assembly conversion kit is a smart choice because it swaps in a durable 4 pin relay that meets or beats OEM specs. You’ll like that it fits Accord Civic CR-V Odyssey and several Acura models, and replaces part numbers like 39794-SDA-A03. The relay runs on 12 V DC, draws 125 mA, and handles 35 A with silver alloy contacts. It’s a two pack from Hirificing, low heat, compact, and built to last, so you can trust it.
- Purpose:A/C fan / blower motor relay (multi-use conversion kit)
- Vehicle application:Honda / Acura models (Accord, Civic, CR‑V, Odyssey, MDX, etc.)
- Contact type:Normally Open
- Coil voltage:12 V DC
- Replacement / OEM fit:Conversion/upgrade kit replacing OEM 39794‑SDA‑A03 / G8HL‑H71
- Connector / mounting type:Through‑hole / surface mount conversion kit
- Additional Feature:35 A contact rating
- Additional Feature:4-pin conversion kit
- Additional Feature:Pack of two
Blower Motor Relay Compatible with Nissan Infiniti Models
In case you drive a Nissan or Infiniti and want a dependable, direct-fit replacement that keeps your cabin climate working without fuss, the WEITARI Blower Motor Relay 25230-79942 is a great choice because it matches many factory part numbers and plugs in with the same connector type. You’ll like that it uses a plug-in silver alloy contact and mounts easily. It fits many Infiniti and Nissan models from initial 2000s through mid 2010s, so chances are it suits your car. Warranty and seller support through Amazon add peace of mind, and installation is straightforward for most DIYers.
- Purpose:Blower motor relay
- Vehicle application:Nissan / Infiniti models (extensive list of makes/years)
- Contact type:Normally Open
- Coil voltage:12 V (vehicle electrical spec)
- Replacement / OEM fit:Direct replacement for 25230‑79942 / 25230‑79943 (WEITARI)
- Connector / mounting type:Plug‑in connector (listed) / DIN rail mount noted
- Additional Feature:Wide model coverage
- Additional Feature:Chrome exterior finish
- Additional Feature:12-month warranty
GM Genuine Parts 13500114 Multi-Purpose Relay
Provided you want a relay that fits like the original and keeps your blower running reliably, the GM Genuine Parts 13500114 Multi-Purpose Relay is a great choice for professionals and serious do-it-yourselfers. You’ll get a part made to GM OE specification, so it matches fit, form, and function in GM vehicles. You can count on quality, reliability, and durability that meet factory standards, which gives you peace of mind during repairs. It’s aimed at pros, but you’ll find installation straightforward whenever you follow basic steps. Should you want more details, check the product listing for specifications and guidance.
- Purpose:Multi-purpose relay (used for blower motor among other OEM roles)
- Vehicle application:GM vehicles (OE replacement for GM applications)
- Contact type:(Implied) Normally Open / standard relay contact (multi-purpose OE relay)
- Coil voltage:12 V (GM vehicle OE specification)
- Replacement / OEM fit:GM Genuine Parts OE replacement (PN 13500114)
- Connector / mounting type:OE-style relay connector (GM multi-purpose relay)
- Additional Feature:GM OE specification
- Additional Feature:Multi-purpose design
- Additional Feature:Professional-grade part
Factors to Consider When Choosing Blower Motor Relays
If you select a blower motor relay, start off by checking voltage and current ratings to make sure the part can handle your system without overheating. Next examine the relay contact type, fit and connector style, and mounting options so installation is simple and the relay actually mates with your vehicle. Also consider durability and industry standards so you’re not trading short-term savings for premature failure, and know how each choice affects the others to make a confident selection.
Voltage And Current Ratings
Although it could seem technical, matching a blower motor relay’s voltage and current ratings is something you can handle with a few clear checks. Start confirming the coil voltage matches your vehicle electrical system, usually 12 V DC, so the relay will actuate reliably. Then check contact current ratings and pick one equal to or above the blower motor’s maximum draw, including inrush, since motors often pull 10 to 40 A. Look at continuous current and peak make current separately, because inrush can be much higher and stresses contacts. Verify switching voltage and allowance for spikes, typically 12 to 14 V with margin. Also consider contact material and wattage or VA rating to reduce resistance, overheating, and arcing for longer relay life.
Relay Contact Type
Provided that you want a blower motor relay that lasts and works quietly, start looking at the contact type and what it will actually do in your HVAC system. You’ll usually see normally open contacts, which sit open until energized and then close to feed the motor. Pay attention to contact material, like silver alloy, because it cuts voltage drop and resists wear under heavy current. Check the contact current rating so it exceeds stall and running amps, avoiding welded contacts or premature failure. Consider single pole versus multi pole in case you need to switch multiple feeds or resistor packs at once. Also match contact configuration and duty cycle to long run times and frequent switching so the relay won’t overheat or wear out.
Fit And Compatibility
You picked a relay with the right contacts, and now you’ll want to make certain it actually fits and works in your vehicle’s HVAC system. Start by matching electrical specs, like coil voltage and contact current rating, to the HVAC circuit so it runs reliably and won’t overload. Next, confirm pin count, connector type, and pin layout match the relay socket to avoid awkward wiring changes. Check mounting style and dimensions so the relay secures in the available space and won’t rub or block nearby parts. Also make sure contact type and switching configuration suit the blower control logic and any multi speed or PWM systems. Finally, verify environmental ratings for the conditions the relay will face in your vehicle.
Durability And Standards
Should you select a blower motor relay, consider how long it will last and how well it protects your car from heat, dust, and electrical faults. You want relays with recognized ratings like IP67 or UL to guard against moisture, dust, and shock. Check contact material and current rating, for example silver alloy contacts sized for the blower amperage, to cut wear and arcing. Also confirm coil voltage and power draw, typically 12 V DC with coil current in the low hundreds of mA, so the relay stays thermally stable. Look for high cycle life and endurance testing so frequent switching does not wear it out. Finally review operating temperature ranges and sealing to avoid failure from heat, vibration, or contamination.
Mounting And Connector Type
Upon choosing a blower motor relay, consider about how it will sit and connect in your car so you avoid last-minute rewiring or a relay that rattles loose. You’ll pick a connector type that matches the vehicle socket or PCB footprint, because adapters add work and might fail. Then check mounting style—press in, DIN rail, stud, or bracket—so the relay stays put against vibration. Also look at terminal count and layout, blade versus spade, to match blower speed circuits, resistor packs, and control modules. Measure physical dimensions and clearance to prevent interference with nearby parts or airflow. Finally favor relays with compatible mounting seals or IP rated connectors whenever exposure to moisture or dirt is likely, keeping connections reliable.
Thermal And Environmental Protection
After you’ve picked the right mount and connector so the relay sits solid and plugs in without fuss, check how it handles heat, water, dirt, and vibration, because a relay that fits poorly can still fail fast in case it can’t handle the environment. You’ll want an IP67 rating or higher so dust and temporary immersion won’t stop the relay from working in wet HVAC compartments. Next, verify the operating temperature range, commonly −40°C to +85°C, so coil and contacts survive engine heat and cold starts. Look for sealed housings, conformal coatings, and silver alloy contacts to resist corrosion from moisture and road salt. Also confirm UL approval, vibration and shock ratings, and thermal protection or derating with current margin for safe intermittent peaks.
