Chevrolet Chevy II HVAC Temperature Control Bulb Bulb Size

The Chevrolet Chevy II hvac temperature control bulb uses a unique 53 bulb size for the lighting system. Data for the specific bulb size covers the range from 1962 to 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
1962-1963	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 bulb size 53 is an ANSI-standard type recognized in both the United States and Canada. It operates on 12 volts and draws 2 watts, placing it in the low-wattage range suited for indicator and illumination roles such as HVAC temperature control panels.
The 53 bulb uses a BA9s base, a miniature bayonet fitting with a 9mm cap. This base type is distinct from the more common BAY15d or BA15s bases found in exterior lighting, and substituting an incompatible base would result in a non-fitting installation.
The single-filament construction of the 53 bulb means it serves one lighting function only, with no provision for dual-intensity operation such as that found in stop/tail combinations.
The Chevrolet Chevy II uses the 53 bulb for its HVAC temperature control illumination across the 1962-1963 model years, indicating a consistent fitment specification for both production years covered in these records.