How to Determine if a Car Thermostat Switch is Good or Bad?
1 Answers
Methods to determine if a car thermostat switch is good or bad: During operation, if the cooling system temperature is too high, the water temperature gauge needle will point to the red line, the water temperature warning light will flash, and it may even boil (commonly known as "boiling over"). When the engine accelerates, there will be noticeable metal knocking sounds, accompanied by insufficient power, flashing water temperature warning light, difficulty in shutting off, and other phenomena. Here is some relevant information about car thermostat switches: 1. The thermostat switch is located on the air conditioning control panel, while the temperature sensor is installed at the air conditioning intake. The thermostat switch in a car serves to control temperature, mainly for air conditioning. It controls the air conditioning compressor. When the set temperature is 25 degrees Celsius, the compressor will turn off once the cabin temperature reaches 25 degrees, but the fan will continue to operate. Therefore, the thermostat switch controls the air conditioning compressor, not the fan. 2. It consists of a wax-type temperature-sensitive driving element and a two-stage contact mechanism. It uses the sudden volume expansion of wax when heated from solid to liquid to move the push rod and control the opening and closing of the contacts. As the coolant temperature rises, the wax begins to expand, pushing the push rod through the rubber sealing membrane and overcoming the tension of the spring frame. When the coolant temperature reaches 95°C, the low-speed contacts close, powering the radiator motor fan to operate at a low speed of 1600 rpm. When the coolant temperature continues to rise to 105°C, the wax further expands, causing the high-speed contacts to close, making the radiator motor fan operate at a high speed of 2400 rpm to increase cooling intensity. When the coolant temperature drops, the wax contracts, and the push rod retracts under the tension of the contacts, disconnecting them, thereby controlling the radiator motor fan.
