![]() In case the coolant temperature warning light is still illuminated after starting the vehicle, it will signal that the vehicle is experiencing trouble in the system. When the engine is started, the coolant warning light (also known as the engine temperature warning light ) will illuminate for a few seconds to check the light bulb. What The Coolant Temperature Warning Light Means The coolant temperature warning light comes on when there’s a problem with the fluid level or the temperature. The computer system of your vehicle monitors the overall fluid level and the coolant temperature. It looks like a thermometer or shows the word ‘temp’ or ‘engine overheating.’ Whenever these words flash or the sign lights up, your car is in danger. You will find it on the dashboard gauge cluster. For this reason, it’s necessary to take the coolant temperature warning light seriously. Get Heat and A/C Service at Firestone Complete Auto Careĭon't wait till the first big frost to take care of car heater problems! If your car only has heat when driving, schedule an appointment at your nearest Firestone Complete Auto Care for professional heat and A/C services.Engine damage can happen for many reasons, and overheating is one of them. However, low coolant levels are often the culprit in this situation and can lead to poor engine performance, overheating, and inconsistent heat (or cold air) coming from the vents in your cabin. Air pockets within the cooling system can prevent adequate coolant circulation and are sometimes the result of low coolant or a faulty radiator cap. If your heat only works when driving, this can also be caused by air pockets. When you're dealing with heater core problems, it's best to have your vehicle inspected by a professional since this component can be difficult to access (located deep behind your dash on most cars) and messy to fix. It may also start to malfunction if the cooling system is not maintained properly. Your heater core may become clogged due to debris build-up. This coolant, typically around 200 degrees, then delivers the hot air needed to your car's interior. In some vehicles, a valve opens up and allows hot coolant to flow to the heater core when you turn on the heat. Then, the blower motor moves air across the heater core fins, allowing warm air to blow out of the A/C ducts. The water pump pushes hot coolant through heater hoses to the heater core. When this component becomes clogged, you may start to experience car heater problems. The heater core uses hot engine coolant from your car's cooling system to warm your vehicle's cabin. While a blocked heater core is not one of the most common car heater problems, it could ultimately be the cause. The result: your car's heater may stop blowing hot air - idle or otherwise. If the engine does not warm up as it should due to a stuck open thermostat, the heater won't be able to build up the warmth needed. When this component is stuck open, you may experience low engine temperature. Debris and corrosion build-up can prevent it from closing correctly. Your vehicle's thermostat helps to maintain proper engine temperature by controlling the flow of coolant out of the engine. Whatever the cause, it's best to have the issue inspected by a professional technician at your local Firestone Complete Auto Care. There are many reasons for low coolant levels, including irregular maintenance and leaks within the coolant system. Check your owner's manual for how to check coolant levels or have a professional check the cooling system for you. The first thing you should check in this instance is your coolant level.Ĭaution: Never open a perceived hot or pressurized cooling system. A properly functioning coolant system is essential to many components within your vehicle, and having no heat at idle is typically a sign that something is amiss. If the coolant is low and your heater is on, you may notice that your car heater only works when driving. Your engine accumulates a lot of heat when working, and coolant helps to collect this generated heat by transporting it to your vehicle's radiator for cooling. ![]() ![]() You May Have Low CoolantĬoolant regulates engine temperature and the flow of hot air into the cabin. If your car only has heat when driving, the following issues may be to blame. Many issues with inconsistent heat in the cabin can stem from coolant-relatedissues. Your car's heater works in tandem with your engine's cooling system. ![]() Why Does My Car Only Blow Hot Air While Driving? What gives? Stay warm this season by learning what could be causing your heater to only work when you drive and what you can do about it. You pull up to a stop in your car on a cold day, and suddenly your cabin's heat turns into an icy blast.
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