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There could be a few different issues that could cause the temperature gauge on your 2008 Ford Focus to read hot when the engine is not actually overheating. Here are a few things to consider:
Failed thermostat: The thermostat is responsible for regulating the flow of coolant through the engine. If the thermostat is stuck in the closed position, it could cause the temperature gauge to read hot even though the engine is not overheating.
Failed temperature sensor: The temperature sensor sends a signal to the temperature gauge to indicate the engine's temperature. If the temperature sensor is faulty, it could cause the temperature gauge to read hot even though the engine is not overheating.
Wiring issue: If there is a problem with the wiring that connects the temperature sensor to the temperature gauge, it could cause the gauge to read hot even though the engine is not overheating.
To determine the cause of the issue, it may be necessary to perform some diagnostic tests and possibly replace some components. A mechanic or a professional auto repair shop will be able to diagnose the problem and recommend the appropriate repairs. It's also a good idea to keep an eye on the engine temperature and take note of any other symptoms or issues you may be experiencing. This information can help the mechanic diagnose the problem more accurately
Fifst port of call in temperature sender. Check if connected. If it is short the connector to ground and your gauge should go to hot meaning sender faulty. If not then gauge or wiring to instrument cluster.
Pull off the negative battery cable and unplug the sensor. See if the gauge needle returns to normal. Try tapping on the cluster to unstick the needle. No luck? Replace the temperature gauge.
The thermostat is stuck closed replace it and the problem is fixed. I would recommend replacing the hose as it has been weakened from the swelling and overheating.
Hello sounds like the thermostat is stuck open. This device opens and shuts depending on the temperature of the engine. When the engine gets to a certain temperature it will open allowing hot water to circulate to the heater matrix which warms up the car interior. As yours is possibly stuck open the cold water is just being circulated, hence blowing cool air. You should notice the temperature gauge stays very low unless you are stuck in traffic where it will rise. This is a cheap fix so no need to worry.
Let the truck run for about 15 minutes. If the engine temperature does not come up turn the heater on and check to see if the air coming out is hot or cool. If it is hot the engine's thermostat is operating fine and most likely the problem is with the temperature sending unit for the gauge. If the air is cool the thermostat is stuck open. Try replacing the thermostat if the air is cool.
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