Yikes! Is your furnace only blowing lukewarm air rather than hot air? Reasons Why Your Car Heater Isn’t Blowing Hot Air. If it receives power, check if the blower motor is burned out. It should have level indicators that show how full or empty it is. Tire Balance vs. Alignment: Which One Do You Need? The heat that comes through the vents is generated by the coolant being passed through a heater matrix (it's like a miniature radiator) behind the dashboard. Depending on your furnace, you may or may not need a screwdriver to remove the main cover. Follow these steps to fix the problem. my ac,heater,defroster.andblower moter do not work. If the blower doesn't receive power, check the blower fuse to make sure it's not blown. FORGOT PASSWORD? There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. If the original fuse is not blown, trace the problem back to the source by testing the resistor, relay, and switch. Save time in the store by booking your appointment online. Engine coolant contains a precise mixture of antifreeze and water, which helps keep your engine from overheating or freezing. Plus, many of the same issues that prevent your car’s heater from blowing hot air can also lead to engine overheating and decreases in performance! At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. If you suspect that something is amiss with your car’s heater core, watch for these signs: Fog inside of your car. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. not all vents blow warm air. Get the Latest Tech News Delivered Every Day, Lifewire uses cookies to provide you with a great user experience. However, low coolant often indicates another problem, such as a leaking gasket or hose. When his inspector looked at his HVAC system (a heat pump, meaning it both heats and cools the house), a few big problems immediately made themselves known. If you determine that hot antifreeze flows through the heater core, there may be debris in the heater box. Already Tried: I haven't had the car checked yet. 2) Thermostat that is stuck open. Reply . This can happen when leaves, pine needles, or road debris are in the heating system. The heater core looks (and works) similar to your car’s radiator — it’s made up of a series of narrow tubes and fins. Although it’s a pretty simple device, a functioning thermostat is vital to keeping your engine running at optimum temperature. What gives? let the vehicle warm up and see if it is blowing hot air. Either the blower isn't working, in which case you may get warm air but not much of it, or it is blowing air but it may not be very hot. Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air. my 2004 volvo,s40 1.9 with turbo. I'm currently suffering from the exact same problem with my car (a 1988 LeBaron). Reply Delete. After removing the blower, you may find that the squirrel cage is clogged with so much debris that the motor can't operate. Refill the cooling system with a 50/50 mix of anitfreeze and water. But after a few minutes, you notice it still isn’t blowing hot air! 9 comments: no April 13, 2012 at 7:43 PM. If cold air is coming out of the heating vents, even when the vehicle is warmed up and the thermostat is set to hot, you could be dealing with one of the following problems: If the heater is broken because it's not blowing any air, it's likely due to a faulty blower motor or electrical connection. A damaged thermostat may become stuck in the open or closed position. Replies. First thing to check is your coolant level. Learn What Happens If Your Cabin Air Filter is Dirty, Best Winter Drives in Each Region of the USA, Fly or Drive: Comparing Costs of Road Trip vs. Air Travel, Why You Should Never Put Diesel in a Gas Car, Bridgestone to Give Additional $760,000 to Boys & Girls Clubs COVID-19 Efforts, What is Carb DayⓇ at Indy 500Ⓡ? Any degree of blockage in the system can lead to the condenser not being able to execute its … Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air. Winter that i notice it more home blog what to do if your car heater is n't blowing warm inside. You diagnose and fix a car heating system to be replaced/repaired not blowing any hot particularly... Malfunction, including a blown head gasket, which can be costly to fix cold... The symptoms were lack of hot air ( a 1988 LeBaron ) the heater.... 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