Chevrolet Biscayne HVAC Temperature Control Bulb Bulb Size

The Chevrolet Biscayne HVAC temperature control bulb utilizes size 53 for illumination within the dashboard assembly. Data for the specified component covers the period from 1958 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 Size
1958-1963	53

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.	53

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Additional Notes

The HVAC temperature control bulb for the Chevrolet Biscayne is specified as a type 53 across all listed model years, spanning 1958-1963.
The type 53 is an ANSI-standardized bulb recognized in both the United States and Canada, operating at 12 volts and 2 watts.
The type 53 uses a BA9s base, a miniature bayonet fitting commonly associated with low-wattage instrument and indicator lighting applications.
As a single-filament bulb, the type 53 serves a straightforward illumination function with no secondary filament for dimming or redundancy.
The consistent use of the type 53 across the full 1958-1963 production span indicates a stable fitment requirement with no variation between those model years.