Kamoka Blower Motor Resistor 4140123

A blower that’s stuck on high, or that’s lost one or more of its lower speed settings, is a classic symptom of a burned-out resistor pack. The Kamoka 4140123 replaces it with a unit built to original specification.

Key Benefits

A few reasons this is the right part for the repair:

• 15-pin connector matching the factory harness
• Restores every fan speed step, not just the highest setting
• Direct plug-in replacement with no wiring modification required
• Rated for 12V systems, matching standard automotive electrical architecture
• Sourced from Kamoka, a supplier of automotive HVAC and electrical components

What’s In The Box

• Brand: Kamoka
• Part / Model Number: 4140123
• Voltage [V]: 12
• Number of pins: 15
• For manufacturer number: 4140123
• Resistor [Ohm]: 0,2, 0,5, 1,4

Because blower motor resistors are matched to exact electrical and mechanical specifications, always verify fitment using the EAN/barcode or part number above rather than the vehicle make and model alone — the same platform can ship from the factory with more than one HVAC configuration depending on trim level and production year. If you’re cross-shopping, our full HVAC blower parts selection lets you compare specifications side by side before you commit to a part number.

Application & Use Case

The blower motor resistor sits in the HVAC housing between the fan speed switch and the blower motor, using a series of resistive elements to drop voltage and step the fan down through its lower speed settings. On vehicles that use this older-style speed control (rather than electronic PWM control), the resistor is a frequent wear item because current runs directly through it and the elements heat-cycle every time the fan runs on anything but high speed. For background on how this fits into the broader HVAC system, see how automotive HVAC systems work.

The signature symptom of a failed resistor is a blower that works fine on the highest speed setting but does nothing (or very little) on lower speeds — because high speed typically bypasses the resistor pack entirely and runs the motor directly off the battery circuit. In some vehicles a partially failed resistor causes only one or two of the middle speeds to drop out while low and high both still work, which can make diagnosis less obvious than a total loss of low-speed operation. Confirm the 4140123 matches your vehicle’s original part number and pin count before ordering; resistor packs are not interchangeable between vehicles with different blower motor current draws, and using the wrong rating can cause the replacement to fail prematurely.

Installation Overview

The blower resistor is normally one of the more accessible HVAC parts to replace: it’s mounted directly in the HVAC housing, often visible and reachable from under the dash or behind a kick panel without removing other components. The old resistor is unplugged from its connector, unscrewed or unclipped from the housing, and the 4140123 is installed in its place. Because this part sits in the airflow duct, make sure the mounting gasket or seal is intact when installing the replacement to avoid air leaks around the housing.

Quality & Manufacturing Standards

Kamoka is an aftermarket parts brand offering replacement automotive components including HVAC and cooling system parts. Component suppliers in this category typically manufacture under IATF 16949–aligned quality systems, the automotive industry’s standard for consistent, defect-controlled production.

Shipping & Delivery

This part ships from our US warehouse network to all 50 states. Order processing and transit times are listed on our shipping policy. Every order includes tracking, and our contact team can help if you need it faster for a vehicle that’s currently off the road.

Support, Warranty & Returns

We stand behind what we sell: review our warranty policy and terms of service before you buy, browse our FAQ page for common fitment and shipping questions, or contact us directly if you have a question this listing doesn’t answer. You can also browse our full HVAC blower parts selection to compare this part against other options for your vehicle. Learn more about how we source and vet the parts we carry on our about us page.

Frequently Asked Questions

Is this the correct resistor for my specific vehicle?

Match the part number, EAN, and pin count listed above against your vehicle’s original resistor. If you’re not sure, contact our team and we’ll help confirm fitment before you order.

Can I install this myself?

Yes — blower resistors are generally one of the easier HVAC parts to replace, often accessible from under the dash without removing other components, and the job doesn’t involve the refrigerant circuit.

Why do blower resistors fail so often?

The resistive elements heat up every time current passes through them at lower fan speeds, and that repeated heat cycling eventually causes one or more elements to fail open, cutting out that specific speed setting.

Will replacing the resistor fix a blower that doesn’t work at any speed?

If the blower doesn’t work at any speed including the highest setting, the problem is more likely the blower motor, a blown fuse, or a wiring issue rather than the resistor. A resistor failure typically knocks out only some of the lower speeds.

What’s the difference between a resistor and a regulator?

A resistor uses fixed resistive elements to step fan speed in stages and is found on older or simpler HVAC systems. A regulator is an electronic module that provides smooth, continuously variable speed control via PWM and is used on more modern systems. They are not interchangeable.

How long does shipping take?

See our shipping policy for current delivery timing. We ship to all 50 US states.

What’s your return and warranty policy?

Full terms are posted on our warranty policy page. If a part arrives damaged or doesn’t match your order, contact our team and we’ll help sort out a replacement or return.

Is a core exchange required on this part?

No core exchange is required — this part ships as a standalone replacement unit.

Why does my blower only work on the highest fan speed?

This is the classic symptom of a failed resistor pack. On many vehicles, the highest fan speed bypasses the resistor and runs the motor directly, while every lower speed routes current through the resistive elements — once one of those elements burns open, that speed stops working.

What does “4140123” mean on the box?

That’s the Kamoka part number for this exact blower motor resistor — 4140123. Use it to cross-reference against your old part or your vehicle’s parts catalog to confirm you’re ordering the correct unit.