Chevrolet Del Ray HVAC Temperature Control Bulb Bulb Size

The Chevrolet Del Ray hvac temperature control bulb uses the unique 53 bulb size for the lighting system. Data for the specific bulb size covers the range from 1957 to 1958.

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
1957-1958	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 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 typical of indicator and illumination applications 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 common in small-cavity instrument and control panel sockets.
The 53 bulb is a single-filament type, meaning it serves one lighting function without a secondary filament for dual-intensity operation.
The Chevrolet Del Ray uses the size 53 bulb for the HVAC temperature control across both the 1957 and 1958 model years, indicating consistent socket fitment between those two years.
Because the BA9s base is a standardized fitting, physical interchangeability with other BA9s bulbs is possible, though voltage and wattage ratings of any substitute would need to match the 12V, 2W specification to avoid socket or circuit issues.