Dash A/C Cooler Control Switch Assembly

Keep cabin temperature stable and windows clear with this direct-fit HVAC cooler control switch. It commands the compressor and blower so your bus stays comfortable in heat or humidity ️.

Why you need it

The switch lets the driver request cooling, regulates evaporator temperature, and protects the system from icing. It’s vital for passenger comfort, safe defogging, and efficient fuel use on long routes.

How it works

Inside is a durable contact set and variable resistor that send signals to the A/C amplifier and magnetic clutch relay. Turn or press the knob, and the module closes the circuit, energizing the compressor, engaging relays, and illuminating the panel. Feedback prevents freeze-up, cycling the compressor to hold target temps ❄️.

If the part fails

Expect no-cool or intermittent cooling, compressor that won’t engage or stays stuck on, rapid short-cycling, blower in one speed only, burnt-plastic smell, or dash light dead. Continued use can overheat wiring, strain the clutch, and fog the windshield—reducing visibility and comfort .

Technician notes

OE-grade, plug-and-play fit. Inspect connectors, relays, and fuses; clean grounds; confirm clutch gap; avoid hard twisting the knob. Replace if contacts are pitted or the illumination circuit is open.

Compatibility

• Coaster
• Coaster Fuelcell