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no,relay
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The engine cooling relay is typically connected to the vehicle's cooling fan, temperature sensors, and the engine control unit (ECU). When the engine temperature exceeds a certain threshold, the temperature sensor signals the ECU, which activates the relay to power the cooling fan. This helps maintain optimal engine temperature and prevents overheating. Additionally, the relay may be connected to the vehicle's electrical system, allowing it to function properly.
A PTC relay, also known as a positive temperature coefficient relay, is a type of protective device used in refrigerators and air conditioners to protect the compressor from overheating. It uses a thermistor that increases its resistance with temperature, helping to regulate the current flowing to the compressor and prevent damage.
Temperature coolant switch is bad or fan relay is stuck closed. Unplug the temperature switch and see if fan goes off. If not, it is the relay. Unplug relay and check contacts with meter to see if they are close (no resistance). Replace relay or switch depending on results.
The coolant temperature switch and the cooling fan relay (same thing) is usually located in the water outlet housing. It will be the bigger sensor, the smaller is the temperature gauge sensor.
There is a relay in a Vortec 5.7 liter engine that tells the computer the air temperature. When that relay has failed, the computer believes that the air temperature is 40 degrees below zero and compensates with extra fuel causing the engine to flood.
The fuel pump relay assembly is notorious for not working when the weather gets hot. This is especially true when it is hot and sunny, which increases the temperature inside the car. This affects the relay as it is found in the dash. The relay is sometimes referred to as the "main" relay.
A/C or defroster on Relay stuck in closed position Temperature sensor not sensing proper temperature
The engine computer uses the signal from the coolant temperature sensor to decide when to activate the radiator fan relay.
Relay or fan itself
Test the relay and the temperature sensor.