- Faulty temperature sensor: The temperature sensor is responsible for sending a signal to the gauge cluster indicating the engine's temperature. If the sensor is faulty, it may be sending an incorrect signal, causing the gauge to read cold even when the engine is warm.
- Faulty thermostat: The thermostat is responsible for regulating the flow of coolant through the engine. If the thermostat is stuck open, it may allow too much coolant to flow through the engine, causing it to run cooler than normal. This can result in a cold temperature gauge reading and a heater that blows air.
- Low coolant level: If the coolant level is low, it may not be able to circulate properly through the engine, leading to overheating and a cold temperature gauge reading.
- Faulty heater core: The heater core is responsible for heating the air that flows through the heater vents. If the heater core is clogged or damaged, it may not be able to transfer heat effectively, resulting in cold air blowing from the heater vents.
- Faulty blend door actuator: The blend door actuator is responsible for controlling the flow of air from the heater core to the vents. If the blend door actuator is faulty, it may not be able to open the door, allowing hot air to flow into the cabin, resulting in cold air blowing from the vents.
- Faulty climate control module: The climate control module is responsible for controlling the temperature and fan speed of the heater. If the climate control module is faulty, it may be sending an incorrect signal to the blend door actuator or the heater fan, resulting in cold air blowing from the vents.
