Chevrolet Corvette HVAC Temperature Control Bulb Bulb Size

The Chevrolet Corvette HVAC temperature control bulb utilizes size 53 for the lighting components within the dashboard assembly. Data for the specified bulb covers the period from 1955 through 1963.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Type	Shop
1955-1963	53	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.	53	Check Price

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Additional Notes

The type 53 bulb is the sole bulb size specified for the HVAC temperature control in the Chevrolet Corvette across all listed model years, covering 1955-1963.
The type 53 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical parameters shared across those markets.
The type 53 operates at 12 volts and 2 watts, placing it in the low-wattage range typical of instrument and control panel illumination rather than exterior lighting.
The BA9s base is a miniature bayonet-style fitting with a 9mm cap, a format widely used in small indicator and panel bulbs where space is limited.
The single-filament construction of the type 53 means it serves one lighting function only, with no provision for dual-intensity operation such as that found in stop/tail bulbs.
The BA9s base is not interchangeable with wedge-base or screw-base bulb formats, so substitutions must account for base type in addition to voltage and wattage ratings.