Product Description
Genuine GM 3840039 Heater Switch (NOS)
This genuine GM 3840039 Heater Switch is a New Old Stock (NOS) component designed for 1964-1972 Chevrolet and GMC 1/2 ton through 2 ton Pickups, Blazer, Panels, and Suburban models equipped with a factory heater and NO air conditioning. This essential switch controls the blower motor for the heating and ventilation system, ensuring proper air circulation and temperature control in your classic truck or SUV.
NEW Out of original box
Key Features:
- Brand: GM
- Part Number: 3840039
- OEM Number: 3840039
- Position: Heater / Blower Motor Switch (Non A/C)
- Condition: New Old Stock (NOS)
Fitment:
| Make | Model | Year | Engine | Notes |
| Chevrolet | C10 / C20 / C30 Pickup | 1964-1972 | All | With factory heater, Non A/C |
| Chevrolet | K10 / K20 / K30 Pickup | 1964-1972 | All | With factory heater, Non A/C |
| Chevrolet | Blazer | 1969-1972 | All | With factory heater, Non A/C |
| Chevrolet | Panel / Suburban | 1964-1972 | All | With factory heater, Non A/C |
| GMC | 1000 / 1500 / 2500 / 3500 Series Truck | 1964-1972 | All | With factory heater, Non A/C |
Fits Years:
1964 1965 1966 1967 1968 1969 1970 1971 1972
Note on Stock Photos: Due to our inventory of multiple identical units for this specific part number, we utilize representative stock photos for this listing. You will receive a component that strictly meets all listed specifications and fitment requirements. Please be aware that because these are vintage parts, minor cosmetic variations—such as surface finish, color, or production markings—may exist between different manufacturing runs. These slight aesthetic differences are a result of historical production processes and do not impact the part's integrity, performance, or authenticity.
A Note on Fitment Accuracy: We manually research our fitment data using vintage manufacturer catalogs to provide you with the most accurate information possible. However, because we are human and these decades-old resources can occasionally contain errors, we cannot guarantee 100% accuracy. We strongly encourage you to perform your own due diligence and verify this part number for your specific application before purchasing. Please note that this part may also fit other vehicles or years not explicitly listed in our research.
Unbeatable Prices & Expectations
While many of our vintage parts were manufactured decades ago, they remain unused and high-quality. Some original boxes may show signs of shelf-wear, such as dust, tape, or surface distress from years of storage. Rest assured, the components inside have been inspected to ensure they are complete and ready to help you finish your project without breaking the bank.
