Saihisday Under-Dash A/C Evaporator Assembly 12V — 6-Vent, 3-Speed Heater/Cooler with 22-Pass Core

Saihisday's 12V under-dash evaporator assembly is a universal add-on A/C and heater unit that delivers high airflow and both cooling and heating performance for cars and trucks without factory-installed climate control.

If you’re retrofitting air conditioning into a vehicle that didn’t come with it, this compact under-dash evaporator/heater from Saihisday provides a robust, serviceable core: a 22-pass, six-vent cooling evaporator and a 6-pass heating section driven on 12 volts. The assembly includes a 3-speed fan, an electrical thermostat, and high rated capacities designed to move large volumes of air and produce heat when needed. It is intended for custom installations rather than bolt-in replacements, so professional installation is strongly recommended for best results.

How much cooling and heating power does this unit provide?

The Saihisday evaporator assembly is rated for high thermal throughput: about 16297 BTU cooling and approximately 14360 BTU heating, with cooling capacity listed at 4107 Kcal/h and heating at 3619 Kcal/h. These figures reflect a system designed to condition cabin air effectively when paired with the proper compressor, condenser, and ducting.

• Cooling capacity: 4107 Kcal/h (16297 BTU)
• Heating capacity: 3619 Kcal/h (14360 BTU)
• Evaporator: 22-pass, 6-way AL design for high heat exchange
• Heater core: 6-pass, 2-way AL construction

What electrical and airflow specs should I expect?

This under-dash unit runs on a 12 V electrical supply and draws roughly 7.6 amps for the blower and control functions. Air circulation is delivered through a three-speed fan capable of moving up to 600 CFM, giving you strong ventilation options across low, medium, and high settings.

• Power: 12V, 7.6A
• Fan speeds: 3-speed blower control
• Max air volume: up to 600 CFM for rapid cabin exchange
• Electrical thermostat included for temperature regulation

How will this unit fit and what should I know about installation?

Saihisday supplies the evaporator/heater core as a universal under-dash module intended for custom installs. It is not a direct bolt-in replacement for factory units; mounting, refrigerant lines, hoses, and integration with a compressor/condenser will require fabrication and HVAC knowledge. For safety, reliability, and optimal performance, use a qualified installer experienced with vehicle HVAC systems.

• Universal under-dash design — adaptable, not direct OEM fit
• Requires pairing with compressor, condenser, and fittings
• Professional installation recommended for leak-free, compliant setup
• Package includes one A/C evaporator heater assembly only

Who is this for? The Saihisday 12V under-dash evaporator assembly is aimed at vehicle owners, restorers, hot-rod builders, and fleet technicians who want to add functional heating and air conditioning to trucks, older cars, or custom vehicles that lacked factory climate control. If you’re retrofitting HVAC into a classic, work truck, or custom cab and need a compact, high-flow core with clear thermal ratings, this unit provides the core hardware needed for a professional installation. Keep in mind it supplies the evaporator/heater only — expect to source and integrate a compatible compressor, condenser, fittings, and controls to complete your climate system.