DORMAN 39MTCHGM Blower Motor Resistor K20

( Brand: Dorman ), ( Manufacturer Part Number: 39MTCHGM ), ( Part Type: Blower Motor Resistor ), ( Compatible Make/model: Chevrolet K20 ), ( Compatible Years: 1986 1979 1980 1981 1982 1983 1984 1985 86 79 80 81 82 83 84 85 ), ( Fitment Info: Hvac Blower Motor Resistor With Air Conditioning; With Stan. ), ( Manufacturer Warranty: 12 Month Warranty ), ( Attention: Read Full Description To Confirm Fitment ), ( Cs-sku: 400 )

Review DORMAN Blower Motor Resistor Chevy K20 fits 1979–1986

The **Dorman 39MTCHGM Blower Motor Resistor** is a high-quality, direct-fit replacement component designed specifically for Chevrolet K20 engines manufactured between 1979 and 1986, ensuring seamless integration with your vehicle s climate control system. This precision-engineered resistor is crafted to regulate the airflow and speed of the blower motor, allowing for smooth, incremental adjustments to the cabin s heating or cooling output. Built with durable materials, the Dorman resistor is engineered to withstand the rigors of daily use, delivering reliable performance even under prolonged operation. Its compact yet robust design ensures a secure fit within the dashboard or HVAC housing, minimizing the risk of loose connections or electrical interference. Whether you re restoring a classic K20-powered vehicle or addressing a malfunctioning blower motor, this resistor provides a dependable solution that restores proper functionality to your vehicle s climate control system. With Dorman s reputation for quality and compatibility, you can trust this part to perform consistently, helping to maintain optimal comfort and efficiency in your ride.

**Pros and Cons of buying a Dorman 39MTCHGM Blower Motor Resistor for a 1979-1986 Chevy K20**

The Dorman 39MTCHGM blower motor resistor is a well-regarded aftermarket replacement part for the Chevrolet K20 blower motor resistor, which is commonly found in vehicles from 1979 to 1986. Here are the key advantages of purchasing this part:

1. **Direct Fitment** Dorman parts are designed to be compatible with the specific application, meaning the resistor will fit directly into the K20 blower motor assembly without modification. This eliminates the need for customization or additional adapters.

2. **Reliability and Durability** Dorman is a trusted brand known for producing high-quality, long-lasting automotive components. The resistor is built to withstand regular use, reducing the likelihood of premature failure compared to cheaper or generic alternatives.

3. **Performance Consistency** A functioning blower motor resistor ensures smooth operation of the blower motor s speed settings (low, medium, high). A faulty resistor can cause erratic behavior, such as the fan jumping between speeds or failing to engage at all. Replacing it with a Dorman unit restores proper functionality.

4. **Ease of Installation** The resistor is a relatively simple component to replace, requiring only basic tools. The part is designed for straightforward installation, even for those with limited mechanical experience. Dorman provides clear instructions, and the part is often sold with necessary hardware (e.g., screws, clips).

5. **Cost-Effective Repair** Replacing a faulty resistor is significantly cheaper than overhauling or replacing the entire blower motor assembly. The Dorman resistor is priced affordably compared to OEM replacements, offering a balance between quality and value.

6. **Widespread Availability** Dorman parts are widely stocked by auto parts retailers, both online and in physical stores. This makes it easy to purchase, and many retailers offer quick shipping, reducing downtime for repairs.

7. **Compatibility with Aftermarket Upgrades** If you ve upgraded other components in your K20 s blower motor system (e.g., a more powerful motor or upgraded switches), the Dorman resistor will integrate seamlessly, ensuring all parts work together as intended.

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1. **Limited Customization** Like most aftermarket replacements, the Dorman resistor is designed to match the original specifications. If you re looking for performance tweaks (e.g., adjusting resistance values for different fan speeds), this part may not offer that flexibility. Custom resistors would require additional research or sourcing from specialty suppliers.

2. **Potential for Counterfeit or Low-Quality Units** While Dorman itself is reliable, purchasing from untrusted sellers (especially online marketplaces) could result in counterfeit or substandard copies. Always buy from authorized retailers or well-reviewed suppliers to avoid this risk.

3. **Mismatched Wiring or Connector Issues** In rare cases, the wiring or connector on the resistor may not align perfectly with the vehicle s harness due to slight variations in manufacturing or wear. This could require minor adjustments or the use of electrical tape or connectors to secure the fit.

4. **No Warranty on Some Retailers** Some online sellers or discount retailers may not offer warranties or return policies, leaving you without recourse if the part fails shortly after installation. Reputable auto parts stores (e.g., AutoZone, O Reilly, local dealerships) typically provide warranties, which can be a valuable safeguard.

5. **Dependence on Other Components** If the blower motor itself, wiring, or switches are damaged or worn, replacing just the resistor may not fully resolve the issue. A thorough inspection of the entire system is recommended to ensure the problem is addressed comprehensively.

6. **Environmental Factors** The resistor is exposed to the vehicle s interior environment, which can include dust, moisture, or chemical residues from air fresheners or cleaning products. Over time, these factors can contribute to wear, though the Dorman part is designed to be robust against such conditions.

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The Dorman 39MTCHGM blower motor resistor is an excellent choice for restoring proper function to the blower motor in a 1979-1986 Chevy K20. Its direct fitment, reliability, and ease of installation make it a practical and cost-effective solution for most drivers. The part s widespread availability and compatibility with aftermarket upgrades further enhance its appeal.

However, it s important to weigh these advantages against potential drawbacks, such as the lack of customization options or the risk of purchasing counterfeit parts. To mitigate these issues, always source the resistor from a trusted retailer and consider inspecting the entire blower motor system during installation.

For the average DIY mechanic or car owner, **purchasing the Dorman 39MTCHGM blower motor resistor is highly recommended**. It strikes a balance between quality, affordability, and ease of use. If you re comfortable with basic electrical work, replacing the resistor yourself will save labor costs. If you re unsure about the installation process, consulting a professional mechanic for guidance or the actual replacement can ensure the job is done correctly.

Additionally, if you experience persistent issues after replacement (e.g., the fan still doesn t respond properly), investigate other components like the blower motor, switches, or wiring harness for potential faults. Regular maintenance, such as cleaning the resistor and ensuring the blower motor assembly is free of debris, will extend the life of the part and the entire system.

Details:

Mounting Hardware Included: No. Product Specifications Wire Quantity. Examined and validated to perform safely effectively. Dorman Blower Motor Resistor fits Chevy K20 1979 1986 39MTCHGM: Brand: condition: New Notes: HVAC With Air Conditioning; Standard Duty Heater, Features:Matches the fit, function and performance of original motor.

Fixes a fan that's only operating on one speed or not working at all. Wiring Harness Included: No. Detailed Applications Years: Vehicle: 1979 1986 Chevrolet K20. Package Contents: Blower Motor Resistor and Instructions.

part #: 39mtchgm price

• $35.33

specifications chvyblowermotor:

• for makes: Chevy
• for years: 1979-1986
• brand: Dorman
• mpn: 39mtchgm
• part type: Blower Motor Resistor
• compatible make/model: Chevrolet K20
• compatible years: 1986 1979 1980 1981 1982 1983 1984 1985 86 79 80 81 82 83 84 85
• fitment info: Hvac Blower Motor Resistor With Air Conditioning; With Stan.
• manufacturer warranty: 12 Month Warranty
• attention: Read Full Description To Confirm Fitment
• cs-sku: 400

general chvyblowermotor:

• Air Conditioning Heating > Blowers Fans > HVAC Blower Motors Wheels
• condition: New

shipping chvyblowermotor:

• transit: 4-9 Days
• service: Economy
• class: Economy
• type: Fixed
• cost: $0.00

offer chvyblowermotor:

• quantity: 1
• sold: 0
• availability: In Stock
• started: April 4, 2026
• options: Ship-to-home

payments chvyblowermotor:

• credit card: Discover
• other
• wallet: Paypal

seller chvyblowermotor:

• city: Salt Lake City, Utah
• # reviews: 23798
• rating: 99.1%

returns chvyblowermotor:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

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