Having your car’s air conditioning go out suddenly can ruin your day fast. If that’s the case and you don’t get it fixed, you could wind up with a major repair expense, or worse… an engine that needs to be replaced. Click here to schedule an appointment for car heater repair at Geller’s Automotive. Repair or Replace Vehicle: Questions and Considerations. Its job is to cool the warm refrigerant, and that makes the air cold when it reaches the evaporator. I just have to find the blower relay and its fuse. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. 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. Your AC Refrigerant is Leaking. I’ll also talk about how you can maintain your heating and cooling system to minimize future problems. The air blowing out of my car heater isn’t hot. Haynes also states this blower relay is powered via a fuse in the junction box from under the dash, #12, 10 amp. Periodically check the level and condition of the coolant. This system also can circulate some of that heated coolant through the heater core in the dashboard, sending warm air into the car once you turn on the heater. https://thecarsguide.com/ac-blows-warm-air-in-car-causes-and-fixes Note, there is no burnt or corroded wiring. If it’s hot in a situation of car air conditioner blowing hot air , then it’s an engine problem. Look under the hood at the AC compressor clutch. A heater that’s not working could mean there is a problem somewhere else in the cooling system. Bring the car to a reputable auto shop that specializes in car air conditioning system. Blog – Expert Automotive Info from Geller’s Automotive in Byram, NJ. Most late-model cars use electric motors (called actuators) to change the air temperature and direction of the airflow by opening and closing flaps in the heater box under the dash. Have you been taking care of these vehicle safety features. Bad ac compressor on car Problems in the Condenser. The amount of hot air and which direction it blows are controlled by the buttons and switches on your dash, which direct the heater valves and the car’s blower fan. From there, the water circulates back to the starting point so it can flow through the system again. When car ac blowing hot air, the possibility of having a damaged wiring system is high. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC. No matter it’s your home ac or the car ac, there is a device named condenser in each of them. 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. As we know, AC connection of a car is done with the wire that is not connected straight. Checking the system from time to time is crucial to keep it in a good condition. Your car’s air conditioner is supposed to provide you comfortable cool air inside the cabin, but if your car’s A/C is blowing hot air, there must be something wrong with the system. However, attempting this without all of the info you need, destines your electrical troubleshooting process to failure. you're left with a miserably underpowered heat or AC system. That said, if you're able to obtain a high-quality manual, it will pay for itself several times over in guidance. Poor maintenance of the air conditioning unit is the main culprit for car air conditioner not blowing cold air when idling. The most common causes of broken air conditioning are leaks or compressor issues. Hello, We have a 2005 Mercury Marquis, and the air conditioning keeps blowing hot air. When any wire is broken that connects to the AC system, it creates the issue. This typically happens if the engine is too hot, so be sure to check your car’s temperature. If you do not feel any air or if you only feel air coming through the vents on certain settings, the problem may lie with the AC’s blower motor or the blower motor resistor. My blower motor does come on. Your air conditioner is great—when it’s working well. The problem of a car air conditioner blowing hot air on one side is mostly seen in cars which have a dual zone climate control system. The radiator, thermostat, belts, water pump and hoses are responsible for circulating water to the engine to keep it from overheating. First, the air conditioner may not be the problem. It has A/C but is a short body and has no rear heat or A/C. If it’s hot in a situation of car air conditioner blowing hot … The Dodge owner's manual contradicts this and shows no 10 amp fuse for the purpose of a blower relay, inside the junction box. Any number of culprits could be causing your car A/C to blow cold then warm air, including: A Leak in the A/C System A small refrigerant leak is the most common reason a … Here are a few of the more common reasons that’s causing the car heater to not work properly: It’s simple. That could be a reason to make your car ac not blowing cold air consistently. But a climate control system with no fan to push the air around is anything but controlled Why does the air conditioning keep blowing hot air 8 Answers. If your car AC is blowing hot air, it is very likely that the refrigerant in the unit is low. As did the author of this letter, you want your fan back. It’s really quite ingenious. All the relays in the PDC have designated legends on the cover, but none indicate they are for the front blower relay. If our certified auto technicians find a problem, we will let you know about it so you can have it fixed before it becomes a major problem. It has been to the car dealer eight times. If your air conditioner is blowing warm air, or just not working properly, it is best to schedule service … To that end, if your owner's manual is incomplete, buy a proper repair manual. Faulty Compressor. Take note that a clogged condenser is just a contributing factor to why the car air conditioning blows hot air and not blowing cold air. 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? Haynes say it is located in the PDC under the Hood, along with a 40 amp blower fuse in the PDC. Low Refrigerant Levels. With each service, we conduct a courtesy inspection of all the major engine systems. Did you know it’s part of the cooling system? The most common cause of hot air coming from car AC vents is low levels of refrigerant. That means a trickle out of your vents instead of the rush you asked for. The easiest way to maintain the entire cooling and heating system is to bring your vehicle to our auto repair shop in Byram, New Jersey. In the case of this Dodge's blower, the answer was fairly easy to discern. Many different things can go wrong here causing the whole system to work poorly or not … Some cars have a shut off feature that will disengage your car air conditioner compressor if your engine is under duress. The condenser, while looking like a radiator, acts as a cooler on the ambient temperature that blows through the car. In that case, some joints may leak or lose while operations. Check if the blower motor receives power. Although an automotive AC system has few moving parts, diagnosing why your car is blowing warm air can be tricky. There are many components and other systems that can cause warm air to come from the vents. 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. Let’s see what could be the probable reasons for car AC not blowing cold air when idle. If one or more of these issues is present, your vehicle may blow out cool air rather than heat: Not enough coolant in the engine Problems with the heater core Clogged or broken heating controls Dysfunctional thermostats Water leaks This is often the case. 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. Step 3: Check the strength of airflow. If that’s not what is causing it, check the engine’s condenser. This blog post will give you a good idea of what might be causing the problem with your car heater. Dodge owners manual shows the 40 amp blower fuse, #25, but does not mention any blower relay in the PDC. This condenser has cooled and fans to push the air through. If the fan is damaged and does not operate at full power, it will not cool down the heat coming from the refrigerant. The Haynes manual says the blower is activated by a relay. It then feeds that cool air into the engine. As you get in your car and turn on your AC, you probably expect it to be blowing hot air for the first minute or two until the system cycles through enough to cool it. To fix any blower, the first things to look at are the fuses, relays, and electrical connections. Car not blowing hot air?