Where to Install the Temperature Control Switch for Car Air Conditioning?
2 Answers
Car air conditioning temperature control switches are installed on the evaporator housing. Below is an introduction to air conditioning: 1. Function of air conditioning: Uses the continuous cycle of refrigerant to achieve cooling; draws in fresh air from outside for ventilation and air exchange, preventing window fogging. 2. Working process of the car temperature control switch: Composed of a wax-type temperature-sensing driving element and a two-stage contact response mechanism. It operates by utilizing the sudden expansion of paraffin wax when it changes from solid to liquid, moving the push rod to control the opening and closing of contacts.
When I help install temperature control switches at the repair shop, the most reliable location is on the air conditioning evaporator housing. It's right behind the glove box on the passenger side—just remove the cover panel and you'll see the silver aluminum casing. This spot provides the most direct temperature changes, so mounting the controller here ensures accurate sensing of the cooling temperature. During installation, make sure to secure the temperature probe tightly with a clip to ensure full contact with the evaporator surface. If you just wrap it randomly around the AC lines, external temperature interference may cause misjudgment, leading to frequent on/off cycling that could damage the compressor. I've handled dozens of vehicles this way—just remember to route the wiring away from moving parts to avoid getting the wires pinched by the air blend door mechanism.
