GM 3055378 Four-Port Thermal Vacuum Switch 1981-1990 Chevrolet GMC NOS

Product Description

Genuine GM 3055378 Four-Port Thermal Vacuum Switch (NOS)

Restore proper emissions control and vacuum system functionality in your classic 1981-1990 Chevrolet or GMC vehicle with this New Old Stock (NOS) GM 3055378 Four-Port Thermal Vacuum Switch. This essential component regulates vacuum flow based on engine temperature, ensuring optimal performance for various systems including EGR, canister purge, and transmission control. This part fits select Chevrolet and GMC 1981–1990 trucks equipped with EFE/trapped-spark vacuum controls.

NEW Out of original box

Key Features:

• Brand: GM
• Part Number: 3055378
• OEM Number: 3055378
• Condition: NOS (New Old Stock)

Fitment:

Fits Years:

1981 1982 1983 1984 1985 1986 1987 1988 1989 1990

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.

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.