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Jeep J20 HVAC Blower Motor Relays

Jeep J20 Hvac blower motor relays

Starting at $32.95, AutoBuffy stocks 1 HVAC blower motor relays from Standard Ignition for the Jeep J20. The blower motor relay is a small electrical switch that controls power delivery to the cabin blower motor. When it fails, the relay can no longer energize the motor, leaving you with no airflow for heating or air conditioning regardless of fan speed setting.

Signs your Jeep J20 needs a new HVAC blower motor relay

  • Blower fan produces no airflow at any speed setting, even though the HVAC controls appear to function normally
  • Blower works only on certain fan speeds — typically the highest setting — because the relay circuit is partially failed
  • Fan cuts out intermittently during driving and restores itself without any input, pointing to a relay contact that opens under heat or vibration
  • Clicking or chattering noise from the relay box area when the fan switch is turned on or adjusted
  • Blown fuse in the blower motor circuit that returns immediately after replacement, indicating the relay is sticking closed and overloading the circuit
  • No change in cabin airflow after verifying the blower motor, resistor, and fan switch all test within spec — relay is the remaining suspect

Which HVAC blower motor relay should you buy for your Jeep J20?

The most important decision is matching relay contact rating and pin configuration to the original spec — an undersized relay will overheat and fail quickly, while a mismatched pin layout simply will not seat in the fuse/relay box. Beyond fit, you can choose between OE-sourced relays and quality aftermarket units, both of which are reliable options when they carry the correct amperage rating for the Jeep J20.

OEM / OE-supplier relay
Best for
Owners who want exact factory specifications and plug-and-play installation
What you get
Correct contact rating, identical pin layout, and materials matched to the original design — highest confidence in longevity
Quality aftermarket relay (branded)
Best for
Budget-conscious repairs without sacrificing reliability
What you get
ISO-rated contacts, standard Bosch-style or vehicle-specific footprint, typically a lower price than dealer pricing while meeting original amperage specs
Relay + fuse kit combo
Best for
Cases where repeated fuse failures have accompanied the relay fault
What you get
Replacement relay and correctly rated fuses together, ensuring both failure points are addressed in one service
Multi-pack / shop pack
Best for
Fleets, high-mileage vehicles, or shops that service multiple Jeep units
What you get
Two or more relays at a per-unit discount — useful when the design is known to be a wear item on the J20

Hvac blower motor relays brands we stock for your Jeep J20

Standard Ignition
1 option · from $32.95

Replacing the HVAC blower motor relay on a Jeep J20

Easy⏱ 15–30 minutesRelay puller or needle-nose pliersMultimeter (for verification before and after)Flashlight or work lightOwner's manual or fuse box diagram

Locate the correct relay slot using the fuse box diagram, grip the relay firmly with a relay puller or needle-nose pliers, and pull it straight out of the socket — no fasteners are required on most Jeep J20 applications. Press the new relay fully into the same slot until it seats, then confirm the blower operates at all speed settings before closing the fuse box cover. If the blower still does not function, verify power and ground at the socket before condemning additional components.

Frequently asked questions

How much does it cost to replace hvac blower motor relays on a Jeep J20?
The part itself starts at $32.95 on AutoBuffy. Because the relay seats directly into the fuse/relay box with no fasteners, most owners replace it in under 15 minutes, making labor cost minimal or zero. A shop might charge a small diagnostic fee plus one hour of labor if the relay was not the first component inspected.
Where is the HVAC blower motor relay located on a Jeep J20?
On most Jeep J20 applications the blower motor relay sits in the underhood fuse and relay box or in a secondary interior fuse panel near the firewall or driver's footwell. Consult your owner's manual or the fuse box lid diagram to identify the exact slot — the relay is usually labeled 'BLOWER,' 'HTR,' or 'A/C BLW' on the diagram.
Can a bad blower motor relay damage the blower motor on a Jeep J20?
A relay that sticks closed can allow continuous uncontrolled current to reach the blower motor, which can overheat motor windings over time. A relay that simply fails open causes no airflow but does not harm the motor. Replacing a faulty relay promptly prevents the risk of secondary motor damage and a more expensive repair.
How do I test the HVAC blower motor relay on a Jeep J20 before buying a replacement?
Swap the suspect relay with an identically rated relay from another circuit in the same fuse box — many vehicles use the same relay type for multiple systems. You can also use a multimeter or a simple 12V test light to verify the relay coil energizes and the contacts close when power is applied. A relay that fails either test should be replaced.
Will a faulty blower motor relay affect the air conditioning compressor on a Jeep J20?
The blower motor relay controls fan airflow only and is separate from the compressor clutch relay and A/C pressure circuits. A failed blower relay means no cabin airflow, so conditioned air is not delivered even if the compressor is working correctly. Replacing the relay restores airflow but will not fix an independent compressor or refrigerant issue.
How long does an HVAC blower motor relay last on a Jeep J20?
Relays are electromechanical components with contacts that wear gradually through repeated switching cycles. Lifespan varies widely based on usage patterns and operating temperature, but many last the life of the vehicle while others on high-cycle or high-heat applications fail within several years. Corrosion in the relay socket can accelerate failure regardless of the relay's own condition.

Shop hvac blower motor relays by year for the Jeep J20

1981

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