If the fan isn’t working, you probably need to have the blower motor fixed or changed. To fix any blower, the first things to look at are the fuses, relays, and electrical connections. 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. Is there a good way to bleed the system of air? It has a pressurized coolant reserve tank and no bleeder valve. 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. I’ve read about air in the cooling system as a common cause for Nissan Frontiers (and Titans). 3. If your car’s coolant has the right ratio of antifreeze and water, it shouldn’t freeze in the winter or get too hot in the summer, ensuring that your car’s cooling system can effectively absorb and dissipate excess heat created in the engine. Sun or Snow: Are All-Weather Tires Right for You? The trouble relates to the blower motor and its activation. 2; the air mix control motor should run, and stop at Max Hot. Haynes also states this blower relay is powered via a fuse in the junction box from under the dash, #12, 10 amp. This is often the case. Why is the Heater Not Blowing Hot Air? Dysfunctional Thermostat. That means a trickle out of your vents instead of the rush you asked for. WHY MY CAR HEATER DOES NOT BLOW HOT WARM AIR. The heater control system of a vehicle runs the blower motor, blend doors, and temperature operation. Various issues may cause your blower fan to malfunction, including a blown fuse or damage to the blower fan’s internal components. Check if the blower motor receives power. Find the procedure in a shop manual (at auto parts stores for about $20). The cooling system circulates a coolant through the engine that absorbs heat. Engine coolant contains a precise mixture of antifreeze and water, which helps keep your engine from overheating or freezing. If anyone has any advice on what do do I would be grateful. Learn what’s keeping you from enjoying your car’s warm air and what you can do about it. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. Although it’s a pretty simple device, a functioning thermostat is vital to keeping your engine running at optimum temperature. As most of the country we got really cold & once again my heater was not blowing hot air. This dial, which changes the amount of heat you want, is run by an electronic component called an actuator that controls the amount of hot air that enters into the car. HEATER BLOW COLDIn this video we will explain the reasons why your car heater might blow cold air. The blower fan is responsible for ventilating that warm air from the heater core through your car’s vents! The heater core’s maze-like network of tubes is susceptible to clogging and leaks, reducing the coolant level or flow through your engine’s cooling system. I work in the telephone business and am very familiar with DC wiring. All Rights Reserved. But if your car heater blows cold air and you’ve checked both heater core hoses to make sure they’re hot, you likely have a bum blend door actuator. 2) Thermostat that is stuck open. The rear heater works. No matter what the temperature is set to it blows cold air on the passenge … read more Some of the common problems we see when a vehicle heater does not blow warm air are: 1) Low coolant level on a vehicle due to a coolant leak. When the air mix control motor stops running, disconnect battery power immediately. Other signs of a faulty heater core include a sweet-smelling scent in your car, windows that become particularly fogged-up, and puddles under the dashboard or on the passenger-side floorboard. Reasons Why Your Car Heater Isn’t Blowing Hot Air. I usually start by checking the coolant level. Car Battery Problems: When is it Time for a New Battery? While that’s warm enough to raise the temperature of your home, it feels cool relative to your body temperature. In the case of this Dodge's blower, the answer was fairly easy to discern. The first is that it can become air-bound or be blocked with air. This warms your cabin. Should I Inflate My Tires in Cold Weather? Haynes say it is located in the PDC under the Hood, along with a 40 amp blower fuse in the PDC. In some cases, the problem might have nothing to do with coolant: If your blower only works on the highest setting, your blower motor control module probably needs to be changed. It has A/C but is a short body and has no rear heat or A/C. The following are some issues that may be causing the heater to blow cold air: Minimum Air Temperature at Floor Outlet 52.2° C (126° F) 56.1° C (133° F) 59.4° C (139° F) 62.2° C (144° F) If the floor outlet air temperature is too low, Both of the heater hoses should be hot to the touch. LiveAbout uses cookies to provide you with a great user experience. But a climate control system with no fan to push the air around is anything but controlled. Blower still does not work. Until the engine warms up, there’s no heat for the heater core to extract. The best repair manual is always a factory manual, but these can either be hard to find or many times more expensive than a "consumer friendly" repair manual. 3 Ways to Help Keep Your Vehicle On The Road Longer, Smell That? You could check the heater valve and the radiator fan if … car heater does not work, blowing cold air. On the other hand, a thermostat that’s stuck in the closed position won’t allow coolant to circulate, interrupting the system that cools your engine and heats your cabin. I just have to find the blower relay and its fuse. Heater not working 3 Answers. It’s Just Been Switched On – Any furnace will blow cold air when it starts up, since it takes time for … Dodge owners manual shows the 40 amp blower fuse, #25, but does not mention any blower relay in the PDC. The heater core is a smaller radiator, but instead of exchanging the heat with the outside air, it sends the hot air to the blower motor and through the climate vents. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as fuses and relays. By using LiveAbout, you accept our, Check the Fuses, Relays, and Electrical Connections, Troubleshooting Common Condenser Fan Problems, Dodge Grand Caravan Flashing LED Display After Battery Disconnect, What to Do When Your Car Won't Start or Turn Over, Troubleshooting and Fixing Turn Signal Issues, 9 Reasons Your High Beam Headlights Are Not Working, Why Isn’t My Car AC Blowing Cold? The heater is not blowing hot air it worked just fine 3 days ago and now nothing but cold air. This is the same coolant that’s used to work your AC during the summer that gets transferred to the heater core. If it does not, reverse the connections; the air mix control motor should run, and stop at Max Cool. So if you have no hot heater air AND you have an overheating engine…this could mean you have no coolant in the engine, or not enough coolant. When you crank up the heat in your cabin, the heater core captures heat from the coolant and transfers it into the cabin in the form of warm air. A c ar heater blowing cold air could be a symptom of the failure of the heating unit. The heater core in your vehicle is a simple device, but it can run into a few common problems. All the relays in the PDC have designated legends on the cover, but none indicate they are for the front blower relay. I need to find the location of this front blower relay and the fuse that powers it. As … This happened a handful of times last year. I have a 2006 Chrysler town and country replaced the thermostat and the heater stopped working, blowing cold air only, went about 100 miles at first it was warm then it started blowing cold air. Your car’s thermostat is a valve that opens and shuts to regulate the coolant flow to the engine and radiator. Note, there is no burnt or corroded wiring. All of these are fairly easy to check. Some vehicles are more prone to this issue than others. It's a pretty simple job that this actuator does. Save time in the store by booking your appointment online. Most (not all) cars are heated by the engine. Many stores are open late and on weekends. If you notice that your thermostat gauge stays on the “C” even after the … Checked for battery at the blower, when the car is running. 7 Possible Causes, Troubleshooting a No Spark Problem in Honda Accord. Heating systems consist of a heater core, a heater fan, the car’s coolant system, and your HVAC controls. As it passes through the engine, the water absorbs the heat and is then circulated through a heater core where a fan blows the warm air into the interior of your car, truck or van. However, while the radiator dissipates heat to the surrounding air, heat from the heater core is blown into the passenger compartment by a blower fan. This fluid moves through the heater core, a fan moves air over the warm heater coils blowing warm air out to the cars cab. The heater core’s maze-like network of tubes is susceptible to clogging and leaks, reducing the coolant level or flow through your engine’s cooling system. Checked continuity of 40 amp blower fuse; it's okay. The blower fan located behind the dashboard pushes air through the climate control vents. A refrigerant is a fluid that is transformed from liquid to gas and vice versa in … However, attempting this without all of the info you need, destines your electrical troubleshooting process to failure. As did the author of this letter, you want your fan back. If you notice no hot air coming out, the first step is to check your coolant levels. why not blowing hot air? Blower still does not work. One of the most common problems with an automotive climate control system is a lack of blower pressure or no blower at all. It will still work with no fan, and you'll usually still be able to control the temperature of the air that is blowing or trickling, out. A new door actuator costs less than $100. What gives? Can you help? If the heater isn't blowing hot air at you when you turn the system on, the blower fan might have a problem. When you run your car’s heater in the colder months, some of this excess heat is blown into the cabin to help you stay warm and defrost your windshields! Is Pennzoil Good Oil? But after a few minutes, you notice it still isn’t blowing hot air! You jump in your car on a cold, wintery morning and crank the heat up. 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. When fluid moves through the engine it heats up. You can usually diagnose and fix the problem yourself in about an hour. Find your nearest location. The Dodge owner's manual contradicts this and shows no 10 amp fuse for the purpose of a blower relay, inside the junction box. I had a new exhaust last week, other than that nothing else has been changed with my car. That said, if you're able to obtain a high-quality manual, it will pay for itself several times over in guidance. Regardless, if you can barely hear or feel a breeze when your car heater is running, issues with the blower fan may be to blame! It’s also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car’s heater to blow cold. I will show in this video. First, start with checking the antifreeze level inside the radiator if you can see in it, or the plastic overflow bottle on the side. A fan then blows across this heated piping and into your cabin. This is different from a furnace, which can blast hot air over 100°F. Rotated all the PDC relays around, they have the same ID, other than ABS pump. A car heater that isn't working could be caused by several simple issues. All of Your Pennzoil Questions, Answered. 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