Minimum Air Temperature at Floor Outlet 52.2Â° C (126Â° F) 56.1Â° C (133Â° F) 59.4Â° C (139Â° F) 62.2Â° C (144Â° F) If the floor outlet air temperature is too low, Both of the heater hoses should be hot to the touch. Answered in 20 minutes by: 10/7/2011. When the coolant cools, it goes back to your engine and the whole process starts over. Why You Should Never Put Diesel in a Gas Car . With the engine running, use a screwdriver to turn the bleed port anticlockwise to expel excess air. Greetings; The wife's 2008 RX350 is having intermittent issues with the heater. This heater core then passes the hot air it generates into the vehicle with a blower fan. Cold Air Blows Intermittently So you went for a road trip or a long drive, and after 30 minutes of driving realized that your AC suddenly stopped working or switched to blowing warm air. Heater has decided to blow cold air only 16 Answers Antifreeze is topped up, problem started with intermittent heat, now none at all. HEATER BLOW COLDIn this video we will explain the reasons why your car heater might blow cold air. In many cases this type of problem can be caused by a faulty HVAC control head or intermittent blend door actuator or low coolant. 11. Chrysler Town and Country blows cold air, Chrysler Town and Country heater blows warm air, or. 08/12/2020 7:40 pm. This genuinely becomes a safety hazard because heat is needed to remove ice and fog build-up on your windshield—not to mention that extreme cold for extended periods is extremely dangerous. Average repair cost is $580 at 11,050 miles. electrical This coolant is then routed through a “mini” radiator called a heater core. If the thermostat breaks closed, then you’ll have overheating problems, but they’re not designed to break that way. What is intermittent cold air? Once it’s reached the proper temperature, a valve in the thermostat opens and allows coolant to flow through the engine. Also, when it is running cold, the air intake sound gets kinda loud. The Terror of Russia's Nuclear Submarine Graveyard, The Most Promising and Exciting Tech at CES 2021, How Biden's Peloton Could Be a Security Risk, Secret New Fighter Jet Uses F1-Style Engineering, This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses. A broken heater in the winter is far worse than malfunctioning A/C in the summer. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. We have a 2010 honda Odyssey and we are experiencing some air conditioning problems. Sometimes it can cost up to four figures if you have a bum heater core, other times it’s as easy as a broken switch or dial on your dash. A fan blows over your heater core and directs warm air into the cabin. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. My car has an automatic transmission. However when I put my foot into it I will start to get heat again. Popular Mechanics participates in various affiliate marketing programs, which means we may get paid commissions on editorially chosen products purchased through our links to retailer sites. service. While driving the air is cold and at times it starts blowing warm air. Just had it flushed and no change. If your car's blowing cold air when the heat's on, your car's engine coolant could be running low. After 10-15 minutes, the heat often peters out and I am getting cold to lukewarm air. Cars.com’s Editorial department is your source for automotive news and reviews. 0. Compact and sturdy, this shovel for SOG should be more than enough to help dig your car out of any snowy conditions. 2. The A/C only blows cold air once in a great while and only for a short time. The first time I noticed, the heat dial was always in the red. It might blow comfortable cold air for 30 minutes and then go back to blowing warmer air. The coolant is housed in a … First, check the coolant level when the engine is cold. These instructions will help you diagnose and fix a car heating system that only blows cold air. This will cause plenty of other issues, but there won’t be enough coolant to sufficiently warmup that heater core as well. Another possibility is that a door or diverter that is supposed to direct warm air into the interior is stuck, preventing proper airflow. The ventilation fans blow air over the matrix and into the car. 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. It's almost as unpleasant to have a heater that's not giving out enough heat. Show More. The taillights go out when the brakes are applied. Your Check-Engine Light Is On — How Much Are Repairs Gonna Cost Ya? Stupid, I know. When your car A/C blows cold then warm, head to your nearest Firestone Complete Auto Care. It takes much longer than normal to get heat in the cabin and will never blow warm air if I'm in traffic or spend a lot of time at idle or low RPMs. WHY MY CAR HEATER DOES NOT BLOW HOT WARM AIR. Now that it's winter and -17 degrees this morn, my 07 Charger R/T 5.7L AWD is having cabin air heat problem. Related: Tips for Starting Your Car in Subzero Weather. Today heat went on then went cool pretty quickly and sporadically went back to heat. If neither of those is the cause, then the heater core and ancillary components are likely culprits. Have an '05 HL (non-limited) and we were running the heat at the low fan speed setting the other day. When the heater is blowing cold air, one or both of the hoses connecting to the heater core do not warm up. This can almost be more maddening than the AC just not working at all, but fortunately a car AC that’s intermittently cold in Chino, CA can be solved with Submitted: 9 years ago. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Post Reply. When it's really cold out, the heater blows air that is barely warm. Turn off the vehicle and let the engine cool completely. Sign Up, Already have an account? Radiator fluids are topped off where they should be. Blend door is jammed/faulty . Games to Play in the Car (With or Without Kids) September 14, 2020. Coolant does evaporate sometimes but if the head gasket was gone and the coolant was going there, you would have been getting over heating before this. Coolant doesn’t just disappear though, so there’s a leak in the system somewhere that you want to find sooner rather than later. What to check first if your car heater is blowing cold On winter mornings, many drivers are disappointed to find their cars and 4x4s have heaters that are blowing out cold air. I had a Chrysler tech recommend that I re-calibrate the Heater-A/C control. The coolant absorbs the heat from the engine, causing it to become hot. A switch or linkage is faulty . This will make it incredibly difficult for the engine to heat up in cold temperatures since it’s constantly being cooled. If hot coolant isn’t circulating through the heater core, perhaps a valve isn’t opening to allow that flow, or the core itself is leaking or clogged, or perhaps developed an air lock if air wasn’t properly bled following cooling system maintenance. 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. The heater in my car is intermittent. jeepmopar76, … My car is over heating and heater blowing cold air changed thermostat not leaking any fluids no fog or wet floor it only over heated once then i parked it could this still cause sirious damage. Wondering if possibly connected to air condition issue. A fan blows over your heater core and directs warm air into the cabin. The A/C only blows cold air once in a great while and only for a short time. CARS.COM — Why does your car heater blow cold air? While your situation the problem is cold air, it may be how this system gets stuck in your car. oil and fluids Whatever it may be, consulting forums specific to your car and speaking with a mechanic should help set you on the path of being warm and happy again. The 2016 Hyundai Tucson has 30 problems reported for a/c intermittently blows warm air. Share this conversation . The blowers work fine, but it now blows cold air most of the time, but will intermittently blow warm air for short bursts then blow cold air again. My Ford F-150 heater is... My Ford F-150 heater is working intermittently. A different reason for the heat to not work would be a lack of coolant going through the engine. An A/C performance check is the easiest way to uncover what’s plaguing your car air conditioner. December 7, 2020. Checking to make sure the engine warms up properly is number one on the list. Opel made a car in Europe some years ago called the Astra which was a divil for doing this and you had to undo the reservoir and hold it high with the engine running to get the air out of the heater core. Because diagnosing and fixing these kinds of problems can be complex, most consumers would likely be better off seeking professional assistance for these particular auto repairs. Slowly the defroster will sometimes defrost the front windshield and sometimes I can feel some heat on my feet when I have the heater on, but nothing is blowing. Car Questions; Ford Repair; Ford F-150: My Ford F-150 heater is working intermittently. Schedule an appointment online or stop by your nearest location today! Do not like cold so ignored. What could be the problem? Log In. If the fan has broken, then there certainly won’t be any warm air from the heater core coming your way. The specifics will vary quite a deal from one vehicle to another, but most systems have some kind of blend door that changes how air flows or doesn’t flow, through the heater core. One of the more obvious problems would involve the blower fan not pushing any air out of the vents. The ventilation fans blow air over the matrix and into the car. My mechanic seems to think that the head gasket is leaking air into the system, and that the air is preventing the … These time increments can vary in every case, of course, but basically it means that the cold air comes and goes. The ac went out on us about 6 months ago so we had the compressor replaced. After driving for about 10-15 minutes at highway speed it doesn't do it. So what happens if your car heater zonks out in mid-January? 3. On cars with automatic temperature control, a “set-and-forget” feature that is supposed to maintain a constant temperature, the computer that controls the system might be malfunctioning. 4. Car heater works intermittently? The coolant absorbs the heat from the engine, causing it to become hot. The core, a type of heat exchanger, gets its heat from liquid engine coolant that circulates through it by means of heater hoses. My car has 49000 miles. CSI: Car Smell Investigation, 2020 Hyundai Palisade Edition, Tips for Starting Your Car in Subzero Weather. It might blow comfortable cold air for 30 minutes and then go back to blowing warmer air. Discussion Starter • #1 • Dec 6, 2013 (Edited) Help! | Yahoo Answers. Save cars. Car Questions. This is a two-for-one space saver as this jump starter from Anker also serves as a battery back for smartphones. If you're having trouble getting the ice off your car, this will help things along. No heat. What I've been able to determine has some effect on this, lately, is engine speed. If you notice that it initially vents out cold air, but over the drive goes to warmer air, then the problem is likely a frozen expansion pipe. We may earn commission if you buy from a link. If the heater is blowing cold air and the car is overheating, it is likely that the problem is related to the engine cooling system as well. If i turn it off for about 10 minutes it will blow hot again for again about 10 minutes and then blows cold again out of the defrost vents. My 08 Milan has started to blow cold air when heat is needed. A condenser’s job in a vehicle is to cool the warm refrigerant that was used to make the air cold in the evaporator. A/C only blows cold air intermittently. Many different things can go wrong here causing the whole system to work poorly or not at all. November 16, 2020. When driving, an engine typically takes about 5-10 minutes to reach its proper temperature. If you search the internet, you will find many instances in which do-it-yourselfers say they did this and tried that, but their heater still blows cold air. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. Submit Your Questio... Lexus RX350 heater ... Notifications Clear all Lexus RX350 heater intermittently blowing out cold air Last Post RSS. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. Fixing this can be as simple as a fluid flush. Meanwhile both passenger’s side vents are blowing cool air. Have an expert inspect your ducts along with the furnace. No other warning lights are active on the display. Temperature gauge goes up to just about normal or slightly above - but no heat Several things can potentially go wrong with automotive heaters because, much like a home heating system, there are many components working together to heat your car. If it’s really low, it might not be able to warm the heater core, even if it’s doing an adequate job of preventing engine overheating. The 2016 Hyundai Tucson has 30 problems reported for a/c intermittently blows warm air. My car is over heating and heater blowing cold air changed thermostat not leaking any fluids no fog or wet floor it only over heated once then i parked it could this still cause sirious damage. Last couple months a couple times I had heat on and noticed cool air blowing out. Compromised flame sensor. What's going on so We can fix it. We took it back to the shop and they noted that the compressor was shutting off for some reason. DOUGDARLAND MEMBER; 2005 KIA SORENTO; 2.4L; 6 CYL; 4WD; AUTOMATIC; 130,000 MILES ; I have a few things going on. If the holdup is by the heater core, then that’s one reason why hot air isn’t blowing. The temp. Access them anywhere. Because the heater core is usually in an inconvenient location, such as behind the dashboard, and might require the dash to be partially removed just to access it, you might want to have a pro look elsewhere first to eliminate simpler possibilities. If your car gets stuck and your heater doesn't work—you're in serious trouble. About a week ago, on a chilly morning, I noticed that my heater fan was not blowing on any speed, regardless of what I tried. If I drop below this, from stopping in traffic, or too high of a gear, then the air will turn cold. Fan blowing but no warm air coming out the vents. The cooling system thermostat also may be failing to open, preventing coolant from circulating. A car’s cabin will heat up as the engine’s coolant heats up. This coolant is then routed through a “mini” radiator called a heater core. The passenger side of the car is getting no/some heat. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. If you notice that it initially vents out cold air, but over the drive goes to warmer air, then the problem is likely a frozen expansion pipe. While idling, the heater blows but doesn't produce hot air. Customer Question. The blower stopped working without any warning, such as hearing a noise or working intermittently. Heater valve is jammed/faulty . I did this procedure and it worked! However, it isn’t always the heater that’s to blame. Chances are that if you’re getting a blast of cold air you don’t want when you turn on the vehicle’s heater or defroster, it’s a sign of the same problem: Something has gone wrong in or around the heater core — a small radiator through which a fan blows air into the cabin to keep everyone toasty. Faulty Heater Fan. In the latter case, there’s a good chance your engine will be running hot and be in danger of overheating. The morning was cool and I was quite irked that it wasn't working and figured I must have blown a fuse. Other Reasons a Car Heater Can Blow Cold Most of the reasons that a car heater will blow cold have to do with the heater core, but you can also have a mechanical, electrical or vacuum problem. Started happening intermittently, now seems only cold. F-150, heater will blow hot, then cold and then heat gauge will rise to extreme high, will boil over then gauge will drop to normal. My car has 118000 miles. Average repair cost is $580 at 11,050 miles. 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 car heater does not work, blowing cold air. To help engines warm up fast and then keep it at a steady temperature, manufacturers use a thermostat to control the flow of coolant. The heater’s warmth is derived from the coolant circulating around the engine to cool it down. The driver’s side is blowing almost uncomfortably hot air. The cruise control doesn't work if the headlights are turned on. It’s not always easy to diagnose heater problems. If the heater still blows cold when there doesn’t appear to be a problem with the water level or the thermostat, it could be due to a blockage of air in the cooling system. I have 2002 T&C, 3.3 V6, that problem is the heater, it will blow warm air, but blows cold air at the lower vents by my feet. why not blowing hot air? 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