Low coolant8/17/2023 Thermostat - A faulty thermostat can cause too much or to little cooling.Often they will be flagged when you read the OBD fault codes. Gauge/Temp Sensor - Is the gauge actually working? Is it reading correctly? Modern cars have an electronic coolant temperature sensor connected to the OBDII computer which informs the temperature gauge.When this happens an air bubble gets trapped in the system preventing the engine coolant from circulating correctly. Air Lock - If you have had a coolant leak, or have recently drained and filled the system, then you may have air lock.Typically the gauge needs to be in the coolant to read properly. Coolant Level - The first thing to check is the coolant level! If the coolant is low, there may be air in the system, which will lead to localized hot and cold spots.There are a few potential culprits for why your car engine coolant may not be heating up: If the temperature gauge isn't moving much from the lowest reading, or the car runs poorly for more than a few minutes on a cold day, the cooling system may not be working properly. This is why, once your car warms up, the temperature gauge should remain relatively static. The thermostat, and clutch or electrically controlled cooling fan work in conjunction to keep the water at the optimum temperature. When cold the thermostat restricts the flow of coolant to prevents it from entering the radiator. Once the engine is up to temperature the thermostat opens and the coolant flows around the whole system. The radiator uses the outside air and a fan to cool the fluid in the system, while the heater core uses the heat from the coolant and a fan to warm the air inside the car.įor the cold engine to warm up quickly, it is fitted with a thermostat. Rubber hoses carry the coolant from the motor to the radiator, and also to the heater core, which is basically a smaller radiator under the dashboard. A thermostat prevents the coolant from flowing until the motor gets warm enough. ![]() ![]() The coolant is forced around the passages by a water pump. A network of passages carry liquid antifreeze/coolant around the hotter parts of the engine. The cooling system on modern cars is fairly straightforward. Read on to see how your car's heater, the heater core and engine cooling system work, see if the car heater will work without a thermostat and find out how to fix it. Trying to work out why your car heater isn't working and why the car heater is blowing cold air when it should be hot? Read on to see what causes a car heater to blow cold air.Įven if you live in Florida, Texas or California, these days you need your car's defroster to work properly to fight those early morning chills, and if you live up north a working heater can be a matter of life or death.
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