MEI Airsource, AC Delco and Motorcraft offer air conditioning and heater controls like cycling switches, cut off valves, air control switches, binary and trinary valves. The air conditioning system must have switches to control the airflow from the fan the on and off operation of the system, high and low pressure switches, relays, resistors and rotary switches. Many of these are direct after-market replacements for OE controls from Ford, GMC, Freightliner, Mack, Peterbilt, Volvo for bunk blowers and for cab blower motors these can be determined by cross referencing from the OEM number or by application look up in the MEI Airsource catalog. Other air conditioning and heater controls are universal fit items for use in any acceptable application. We also offer MEI Airsource knobs, louvers and diffusers.