All the fuses in the fuse block, both inside and under the hood look fine. I replace the bottom two relays and now almost immediately when we turn on the car and start the heater or a/c it blows the fuse. They come in many shapes, sizes, and designs, however, most automotive fuses use a strip of wire that will melt or break if the amount of current that is passing through it exceeds the amperage rating of the fuse. Read on for an idea of how to resolve the issue. Well, fine drivers(G&Gers, Guiders, Garage Gnomes? my ROVER 400 heater hasn't worked in months and now the winter is here it has to be fixed, someone told me it could be a blown fuse, the heat is not blowing out and the car only heats slightly when on motorway journeys, is it possible to be the fuse, and importantly of all will a garage try to get more money of me, instead of telling me its just a fuse. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. A: To borrow a phrase from the most excellent Archer, “Noooooooope!” We’re gonna need you to absolutely stop thinking about how you can heat your car without a heater. Sightly above the max mark now but it didn't cause any problems when I set off to work. There are four main fuse types found in vehicles today: Low-profile Mini, Mini, Micro2, and ATO. When your coolant/antifreeze levels drop, the hot fluid can’t make it to the heater core, and thus, your cabin remains chilly. Simply put, your car’s buttons, knobs, or haptic feedback touchscreens may not be triggering the heating system. Whast is this and where is it located. If there is a blown fuse then you can replace it and the seat will work again. Nos partenaires et nous-mêmes stockerons et/ou utiliserons des informations concernant votre appareil, par l’intermédiaire de cookies et de technologies similaires, afin d’afficher des annonces et des contenus personnalisés, de mesurer les audiences et les contenus, d’obtenir des informations sur les audiences et à des fins de développement de produit. If it has, replace it and test the heater again: If the new fuse blows as soon as the heater switch is operated, there is a short circuit either in the switch or in wiring and you will have to check the switch and along the length of the wire to find it. You also should make sure the plug that connects the seat to the main wiring is plugged in and free of dirt or corrosion. You might need to check the owner’s manual, but they can usually be found under the steering wheel, in the engine compartment, or in the trunk/cargo area. There is no fuse for the heater on the o2 sensor if the heater isn't working its usually the o2 sensors bad. Lightning and USB-C cords are not required. My heater ac blower isn't working on my daughters 2004 honda civic dx. Id there is a software upgrade for my infotainment center, do I have to pay to have it done? 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. A problem with the switch which turns the fan on or off, might also be the source of the problem. 5. Check the fuses under the hood, and check under your glove compartment for a cylinder shaped motor. Thermostat. Always use the manufacturer's recommended coolant, and never mix coolant types or colors. It has A/C but is a short body and has no rear heat or A/C. It will be at the base of the radiator, in between the core and the main hose. The blower fuse is a 40 amp fuse located in the engine compartment’s fuse box. There could even be a puddle of liquid under the front of the vehicle. While you may be getting hot coolant/antifreeze into the heater core, the heater fan, the part that actually blows the heat into the cabin, can break or suffer an electrical short. My blower motor does come on. Whast is this and where is it located. Checking a heated car seat is a car repair you can take on yourself. Thanks, Dan Issue With The Motor's Relay Check for … You will need to purchase new coolant and a new thermostat. My heater buttons will not light up & the entire infotainment center has randomly quit working. Like Katy Perry sang, your car is “hot and then cold.” Let's fix that. Occurring less often than the above issues, debris and particulates that make it into the coolant system can clog your heater core. The fuse is under the hood and is 40 amps. In, fact, this … The second-most common culprit is that your car has low antifreeze or coolant. If this doesn't work, then you can use a fuse tester to see if your blower motor is getting power. Evans High-Performance Waterless Engine Coolant, Star Brite Star-Cool Premium Synthetic Engine Coolant, Got a question? This vital fluid is what keeps your car from overheating. During those hot and muggy summer months, or during those subzero cold winter months, heat pumps can ensure room temperatures are … And you wait — and wait — but the heater just blows cold air. Not good. 12-Volt Car Heater Types. If the fuse looks intact, it is still worth replacing it to see if that solves the problem. Yesterday it happened & I was near a dealership. So if you have a question or are stuck, click here and talk to a mechanic near you. Got a pro tip? 2. Why? As summer dissipates through fall and stretches into winter, most drivers aren’t too worried about their car’s heater. Refer to your manual if you are unsure where the fuses are located on your heat pump because the location may vary with different units. Most of the time these problems are caused simply by a blown fuse so we recommend finding the fuse panel inside your car and checking those fuses. If you can find no fault with the wiring, use a test lamp to find out if there is a feed to the motor. Add the coolant and place the cap back on the reservoir. The motor is usually earthed to the body by a separate wire. A blown fuse might just be the reason your car heater fan is not working. Heaters aren’t the mysterious beast most make them out to be. On my '02 PF, the fuse is shown as "blower motor 15A". A: The average cost of a thermostat is about $45, but if you’re replacing the thermostat, you’ll also need to factor in new coolant, which will set you back around $8-$15 a gallon. Fuses are rated by their amperage and are designed to blow or open when the current being drawn through them exceeds their design rating. (You won't need a blowtorch for this job. A thin metal bar, visible through a glass window on a screw fuse or viewed from the side on a plastic buss fuse, will be broken on a failed fuse. To be sure, start by checking the fuse. It's next to the fuse puller on the fuse block. Though a simple system, a number of issues can arise causing your heating system to not function properly. If the fuse lasts a while and then blows, the fan motor is probably running hot due to worn brushes and/or bushings and should be replaced. (Cadi 1997 Deville) Battery Cable was loose when I tried to start my car this A.M. after tightening it headed into work but the heater no longer worked, think I blew a fuse but can't locate the fuse t … Pour in the new coolant until the reservoir is full. A lack of heat can be a symptom of a much larger problem. Any selection on any of the three controls does nothing. The fan will not blow for the Air/Heat. The trouble relates to the blower motor and its activation. The heating system in your car is supposed to keep the atmosphere warm. Check for blown fuses and replace them to restore normal functionality. You’ve got questions, The Drive has answers! To better diagnose your car’s on-the-fritz heating system, let’s get into the reasons it can go bad. Connect one end of the test lamp to an earth point. Why is my car heater blowing cold air? It may not be necessarily blown. Shorts, broken dials, and bad touchscreens can all lead to malfunctions that prevent your heater from working. Either way, you’re looking at refurbishing your heater core or straight-up replacing it. The Drive and its partners may earn a commission if you purchase a product through one of our links. Another poster said something about a small fuse in the heater matix control. Let’s heat this mother up! Working on your car can be dangerous and messy, so here’s exactly what you’ll need to ensure you don’t die, get maimed, or lose a finger and that you keep your jeans, shirt, and skin spotless—hopefully. 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. A: The common thinking is every five years or 100,000 miles. As we saw earlier, warm water is circulated through the heater core. In some cases, however, the motor is under the bonnet at the rear of the bulkhead. When that coolant heats up, it is transferred into your vehicle's heater core via a few feet of high-temperature rubber hose. A car heater blowing cold air could be a symptom of the failure of the heating unit.. Best 12-Volt Car Heaters: Stay Warm and Cozy In Your Car, Warm up your car during the cold season with our top picks for the best 12-volt car heater, Best Heated Car Seat Covers: Protect Your Seats and Keep Yourself Warm, Keep your body warm while you drive in the bitter cold with these heated car seat covers. Maybe the fan is malfunctioning. The resistor was up there but wires very short. My resistor was above the clutch pedal. Send us a note: guidesandgear@thedrive.com. Solution: This can be as simple as a blown fuse, it could be a wiring issue, or the blower fan could need replacement. This car heater is leaps and bounds ahead of any 12V heater that may or may not work in the first place. Inspect the fuse or fuses to determine which fuse has failed. First, be sure to check the fuse and make sure it isn’t blown. I replaced the relay and it worked for about 2 days. Possibly either a fuse or the blower motor isn't working. When that coolant heats up, it is transferred into your vehicle's heater core via a few feet of high-temperature rubber hose. Follow along as The Drive’s whip-smart info team breaks down the top reasons why your car heater isn’t working properly and how to fix them. The heat in your car my not be working for a number of reasons. Perhaps your temperature gauge is running below normal. And you don’t want to be this lad. Check for blown fuses and replace them to restore normal functionality. A blown fuse might just be the reason your car heater fan is not working. Because you can’t. There are a lot of reasons for a cigarette lighter fuse to repeatedly pop, but one of the more common, and often overlooked, is the presence of a foreign object in the socket. Thankfully, it’s far less time-consuming than replacing your thermostat. The flow of water through the heater core is hindered by a pocket of air. The A/C still works and blows cold air into the vehicle, so I don't think its the HVAC blower fuse, but I am not sure what it could be. Fuses are simple electrical devices that are designed to stop electronic circuits from being overloaded. If you are sure the breaker is not tripped or fuse not blown then it could be high temp cut out located on the thermostat. If the blower only works on the high position, it is the blower motor resister. This can happen when a radiator rusts from the inside or if debris gets through the radiator and lodges itself into the heater core. You’ll need your car’s dusty manual to find out where your fuse box is and which fuse is for the heater. If the fuse does not blow, it might be an easy fix because there was a power surge in the system. It worked last year, and the year before that, why wouldn’t it work this year? The heater resistor wiring connectors burn and loose power. You can check to see if the heater fuse is shot by looking inside your fuse box. I checked the interior fuse box and the HVAC fuse is fine. A: Most heater cores are designed to have very long use-lifes, averaging about 10-15 years. Make sure to replace a fuse with one of the same amperage. 6 Answers. My heater buttons will not light up & the entire infotainment center has randomly quit working. If the heater is on and no heat is felt from the right side dash vents, there may be a problem with the blend air... Airbag light may be on due to blown fuse Triggered by a short in the rear wiper MOTOR/circuit (which causes a fuse to blow), the airbag warning light can... See More Dodge Grand Caravan Problems If a new fuse blows as soon as the blower is turned on, the heater circuit or motor may have a short that should be investigated. There are many reasons your car's heater isn't working. Fuses are also installed in electronic devices and systems. Read on for an idea of how to resolve the issue. This can occur if the engine is working too hard and overheats or if it wasn’t properly filled. This is a safety feature as the excess current can fry the circuits and damage the expensive appliances and devices you have installed in the car. Mount at the bottom of your car or under the dashboard for optimum efficiency. Here’s what you need to know about each heater types; Convection Portable Heaters; Convection portable car heaters draw cold air over an electric healing element. The Drive recognizes that while our How-To guides are detailed and easily followed, a rusty bolt, an engine component not in the correct position, or oil leaking everywhere can derail a project. The heater core works like a small radiator: A fan blows air over the heated fins of the heater core, creating heated air, which in turn is transferred through a series of vents into the cab of your vehicle to warm its interior. 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