It sounds like the burning smell you noticed and the AC not working are related and since you noticed the smell in the cab of your truck it sounds like you may have a short in the wires in your ventilation control panel. I just have to find the blower relay and its fuse. Christine Baker is a marketing consultant with experience working for a variety of clients. There are many reasons why a car heater is not working. If any of these three are leaking, your car heater won’t work properly. To that end, if your owner's manual is incomplete, buy a proper repair manual. If the fan isn’t working, you probably need to have the blower motor fixed or changed. LiveAbout uses cookies to provide you with a great user experience. Blower still does not work. Blown Fuse or Loose Wiring. The Dodge owner's manual contradicts this and shows no 10 amp fuse for the purpose of a blower relay, inside the junction box. 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. When this happens, your main concern is to get them running again as soon as possible. Switch the thermostat from hot to cold and listen. By using Lifewire, you accept our, How to Fix It When Your Car Heater Isn't Working, How to Fix It If Your Car Heater Isn't Blowing Any Air, Universal Replacement Car Heaters That Work, Using a Space Heater as an Electric Car Heater. But the narrow passages can become clogged. Air passing around the heater core is warmed by the hot engine coolant. My radio, windshield wipers and ac/heater fan will not work. https://twitter.com/mroffandonDIY: Fixing the Temperature Knob on an 1999 Hyundai Sonata. Is There a Cheaper Alternative to Air Conditioning? If that doesn’t work, you’ll need to replace your heater core altogether. https://www.wikihow.com/Diagnose-a-Non-Working-Air-Conditioning If there was a short or a surge in the system, the fuse might blow to protect the delicate electronic components from damage -- but in so doing will render the system inoperable until the fuse is replaced. If you determine that hot antifreeze flows through the heater core, there may be debris in the heater box. Actually, you might have blown two fuses: the literal fuse connected to your thermostat and, if you're angry about your AC not working, an internal "fuse." Air conditioners and heaters accomplish their tasks unnoticed when working properly. Haynes also states this blower relay is powered via a fuse in the junction box from under the dash, #12, 10 amp. He also ghostwrites articles for numerous major trade publications. The potential issues here vary whether your heating has gone out or your car’s AC system is on the fritz. Turn the valve clockwise if the gas is off to allow flow to the system. Turn off the vehicle and let the engine cool completely. Blower Fan is not working: If your car blower fan is inactive or damaged, car heater will work but warm air will not reach inside of your car. Can you help? While there are a variety of reasons your Kia Optima heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. So when I first start the truck AC/heat blows fine, but after about 10 to 15 minutes I am getting little to no air. If one hose is the same temperature as the coolant and the other hose is cold, there may be a blockage in the heater core. There are many different places leaks can surface, so be sure to check your hoses, radiator and water pump for damage. To fix any blower, the first things to look at are the fuses, relays, and electrical connections. If it does not turn on, it is an indication that either the switch itself is malfunctioning or the AC circuit is not getting power. 7 Possible Causes, Troubleshooting a No Spark Problem in Honda Accord, Chevy Tahoe Expansion Block and Orifice Tube Locations. Here are some reasons why a car’s heater may suddenly stop working. The specific diagnostic procedure varies depending on the vehicle. By using LiveAbout, you accept our, Check the Fuses, Relays, and Electrical Connections, Troubleshooting Common Condenser Fan Problems, 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? I have a 2000 Honda civic ex. This is often the case. However, low coolant often indicates another problem, such as a leaking gasket or hose. Incoming air goes through the water-heated matrix and is warmed. Lift the hood and check the temperature around where the heater core hoses enter the heater core box. Step 2: Verify that air is blowing. Therefore, if major problems in the heating and air conditioning system fail, as if the power supply to the motor was completely cut off due to overheating or corrosion, the motor will simply not work, which in turn will render the entire heating and air conditioning system unusable, as no air will flow through the vehicle’s air vents. It should have level indicators that show how full or empty it is. Heater core internal passages. A blown fuse often indicates a different underlying problem, so never replace one with a larger fuse to prevent it from blowing out again. If the blower doesn't receive power, check the blower fuse to make sure it's not blown. However, attempting this without all of the info you need, destines your electrical troubleshooting process to failure. When winter arrives, the last thing you want breaking down is your car's heater because not only is a frosty car inconvenient—it's also dangerous. https://www.lifewire.com/car-heater-suddenly-stopped-working-534657 My problem is on a 1996 Dodge Caravan 3.3 liter. I need to find the location of this front blower relay and the fuse that powers it. Rotated all the PDC relays around, they have the same ID, other than ABS pump. Check out what he's been through, and why he should have asked an expert from the start. If the valve is stuck and prevents coolant from flowing through the heater core, that may be the source of the problem. To find out what's wrong with your car's heating system and what you can do to fix it, you first need a basic read of the situation. If the coolant is low, or there is an air lock (and also after replacing any faulty parts) you need to fill the system properly. Verify if you are able to feel air blowing through the vents. Heater control valve When you set the temperature to hot, air being passed over the heater matrix should be ducted into the cabin. The safest way to do this is with a non-contact infrared thermometer. A leak from any of those places can prevent your heating system from working properly. Some reasons can be an easy fix while others may need the assistance of an auto repair shop in the Longmont area. Her expertise includes social media, web development, and graphic design. Rotated all the unmarked relays around in the junction box. If the coolant level is low, the vehicle likely isn't circulating enough antifreeze through the heater core and needs to be replenished. Such as blower fuse cut off or relay or damage of blower motor. Dodge owners manual shows the 40 amp blower fuse, #25, but does not mention any blower relay in the PDC. Check the heater core temperature. Thermostat. Finding a Cheap Fix for a Broken Defroster, How to Fix Sweet, Mildewy, and Burning Smells From Your Car Heater, The 10 Best Portable Electric Car Heaters of 2021, What to Do When the Gauges in Your Car Aren't Working, How to Fix a Car Horn That Won't Stop Honking, If it receives power, check if the blower motor is burned out, If the blower doesn't receive power, check the blower fuse to make sure it's not blown. In a water-cooled car, the heater casing contains a matrix - a small radiator - that takes hot water from the engine through a hose. Fixing the motor should solve the problem in this case. An effective heating system can make for a much more enjoyable winter. It has A/C but is a short body and has no rear heat or A/C. There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. That means a trickle out of your vents instead of the rush you asked for. It will however work when you turn the key all the way back or forward but not when the engine is running. Anyway, a blown fuse between an AC and your thermostat is kind of like a bad battery in your car. Common reasons for the heating system not to work include the following: Low coolant; Air in the coolant system; Malfunctioning heater core; Failed (or failing) thermostat; The potential issues with the AC system are different, and include: Coolant travels through several parts of your engine. Haynes say it is located in the PDC under the Hood, along with a 40 amp blower fuse in the PDC. Check the coolant level. You'll need to have it replaced before the machinery can do its thing. Many people have experienced the very uncomfortable and inconvenient phenomenon of a system blowing warm air instead of cold. But a climate control system with no fan to push the air around is anything but controlled. The way to do this is to go to the fan and test for power with the fan turned on. If the vehicle has a valve in one of the hoses, check its operation. Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. If the heater is broken because it's not blowing any air, it's likely due to a faulty blower motor or electrical connection. Then all of a sudden it started blowing full blast, while the recirc, ac, rear defrost button lights all came on and were flashing...then it all turned off.... - 1996-2000 Honda Civic One of the most common problems with an automotive climate control system is a lack of blower pressure or no blower at all. I noticed the fan was not blowing any air through the vents. This is usually because the coolant has not been replaced in … Not having a working heater in your vehicle could even become a dire situation, if you end up stranded. When a car heater doesn't work, the most common cause is low coolant. 5. You might be able to clear out your heater core passages by flushing them. The Haynes manual says the blower is activated by a relay. There is no battery to operate the blower. If you replace a blown fuse with one of the same amperage and it doesn't go out, then the fuse likely failed due to age. Checked for battery at the blower, when the car is running. You can adjust this heater from 3200 – 6000 BTU/hr and the catalytic heating is 99.98% efficient in comparison to flame heaters which are said to waste around 45% of heat produced and are not safe for use in a vehicle. Not sure if it is a fuse problem or not. Top Reasons Central Heat doesn’t Work. Note, there is no burnt or corroded wiring. Blower still does not work. Coolant that is a dark brown color indicates that there is rust in the cooling system. If the air coming through isn’t hot, the heater core is probably clogged. All of these are fairly easy to check. The freezing air makes you shiver, or the summer heat makes you sweat. The trouble relates to the blower motor and its activation. Check if the blower motor receives power. https://www.thedrive.com/maintenance-repair/36766/car-heater-not-working A motor failure will obviously may cause the fan failure, causing an overall car heater failure. There are some common reasons can occur this. Reply 1: Can we get a little more detail about what happens when they are not working? After removing the blower, you may find that the squirrel cage is clogged with so much debris that the motor can't operate. Why does my heater and ac work once in awhile? There’s no fan inside this heater which means that it’s a super silent option for your RV. When it does happen, you're left with a miserably underpowered heat or AC system. The last common problem with car heaters is a water leak. A blown fuse might just be the reason your car heater fan is not working. Fix this issue by your reliable mechanic. If it receives power, check if the blower motor is burned out. To do this, set the heater controls in the car to maximum heat, remove the radiator cap (or remote mounted coolant pressure cap, sometimes on the overflow tank) and fill to the correct level. Follow these steps to fix the problem. There are many reasons why a car’s heater may not be working. Checked continuity of 40 amp blower fuse; it's okay. But as soon as they stop working, it's readily apparent. If the heater isn't blowing any air, skip to the next section. As did the author of this letter, you want your fan back. Turn the shutoff valve on a gas system counterclockwise; if the handle does not budge, the gas is turned off. It is a 2003 and has 176,xxx miles on it. The heater core is like a miniature radiator built into the dashboard. You should see a valve near the furnace that controls the gas flow. Verify if this light turns on when you reach MAX A/C. You can easily understand this issue. The coolant is housed in a translucent plastic jug in the engine compartment. If not, then we need to find out if there is a fuse/resistor issue with the fan, wiring issue, or the blower motor itself is not working. If your car has no heat, not only would the inside of your car feel like an ice box, but a broken heater can prevent your defroster from blowing warm air to your windshield to eliminate ice and fog, which can pose a hazard while driving. There is also an electric fan , which can be switched on to blow air through the system when the car is stationary, or when extra ventilation is called for. When you regulate the thermostat from hot to cold and don't hear the blend door moving, there may be a problem with the blend door, linkage, wiring, or the thermostat switch, depending on the vehicle. All the relays in the PDC have designated legends on the cover, but none indicate they are for the front blower relay. Of course, any central residential HVAC system is supposed to provide cool air when it’s warm outside and heat when the outside temperature drops. My blower motor does come on. 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. If you can, try removing those controls and look for burnt or blackened wires. Is the heater blowing cold air into the car, or is the car heater not blowing any air at all? All power to every one of the electrical working parts of the car is supplied via fuses. But it sounds like the windows are down and you can hear the fan blowing but barely anything coming out. This can happen when leaves, pine needles, or road debris are in the heating system. I work in the telephone business and am very familiar with DC wiring. The only way to determine which component has failed is to grab some basic diagnostic tools, access the blower motor, and check whether or not it receives power. If your blower only works on the highest setting, your blower motor control module probably needs to be changed. If the vehicle burns coolant, it may have a blown head gasket, which can be costly to fix. You Have a Leak. 2. Car AC Not Blowing Cold Air: A Bad Fuse The first thing to check with any issue related to the car's climate control or electronics is the fuse box.
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