Car Questions; Ford Repair; Ford F-150: My Ford F-150 heater is working intermittently. 0. While idling, the heater blows but doesn't produce hot air. Fortunately I also have heated seats so I was happy that they were giving me some heat. The 2016 Hyundai Tucson has 30 problems reported for a/c intermittently blows warm air. 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 I play with the thermostat, blend door functions etc. December 7, 2020. Sign Up, Already have an account? The ventilation fans blow air over the matrix and into the car. Show More. Faulty Heater Fan. The temp. My 08 Milan has started to blow cold air when heat is needed. No heat. 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. While driving, the heat will cut out, and blow cold air. How we test gear. We have a 2010 honda Odyssey and we are experiencing some air conditioning problems. 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 Also, while driving suddenly it stops heating and just blows out cold air. Games to Play in the Car (With or Without Kids) September 14, 2020. The passenger side of the car is getting no/some heat. The blower stopped working without any warning, such as hearing a noise or working intermittently. WHY MY CAR HEATER DOES NOT BLOW HOT WARM AIR. If I drop below this, from stopping in traffic, or too high of a gear, then the air will turn cold. 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. 4. Log In. Another possibility is that a door or diverter that is supposed to direct warm air into the interior is stuck, preventing proper airflow. sensor in the vent checks the temperature and tries to set the amount of air … If the engine is cold, the thermostat will restrict the flow of coolant into the engine, allowing it to warm up quickly. This blanket will help keep you warm until help arrives. Last couple months a couple times I had heat on and noticed cool air blowing out. Topic starter Greetings; The wife's 2008 RX350 is having intermittent issues with the heater. Turn off the vehicle and let the engine cool completely. | Yahoo Answers. How Does Your Car Heater Work? If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. If you let it sit and idle for a while, it will start blowing hot, but it will also sound and smell as if antifreeze is boiling over. This coolant is then routed through a “mini” radiator called a heater core. Greetings; The wife's 2008 RX350 is having intermittent issues with the heater. Joined: Jan 18, 2015 Member: #146633 Messages: 4 Gender: Male Versailles, KY Vehicle: 06 Reg Cab 4 Cyl. When driving, an engine typically takes about 5-10 minutes to reach its proper temperature. Luckily, unlike many systems on the modern motor car, heating systems are more or less built around the same design as they were 20 years ago - which is ultimately a basic one. 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. October 12, 2020. This coolant is then routed through a “mini” radiator called a heater core. If the holdup is by the heater core, then that’s one reason why hot air isn’t blowing. 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. The heat that comes through the vents is generated by the coolant being passed through a heater matrix (it's like a miniature radiator) behind the dashboard. My friend thinks I am a car-god. Have an '05 HL (non-limited) and we were running the heat at the low fan speed setting the other day. Ask Your Own Chrysler Question. 3. There is likely a problem with your condenser. Here's how: Turn the ignition switch to the ON position. Submit Your Questio... Lexus RX350 heater ... Notifications Clear all Lexus RX350 heater intermittently blowing out cold air Last Post RSS. My car has an automatic transmission. 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. Best Winter Drives in Each Region of the USA. 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. Average repair cost is $580 at 11,050 miles. It might blow comfortable cold air for 30 minutes and then go back to blowing warmer air. Air blows cold. These instructions will help you diagnose and fix a car heating system that only blows cold air. Show Less. In line with Cars.com’s long-standing ethics policy, editors and reviewers don’t accept gifts or free trips from automakers. While your situation the problem is cold air, it may be how this system gets stuck in your car. The ventilation fans blow air over the matrix and into the car. A different reason for the heat to not work would be a lack of coolant going through the engine. Temperature gauge goes up to just about normal or slightly above - but no heat 2. The taillights go out when the brakes are applied. Customer Question. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. 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. And it doesn't matter if its in dual mode or if the temps are separate. Discussion in '2nd Gen. Tacomas (2005-2015)' started by JHinman06, Jan 18, 2015. A condenser has coils and a fan to push the air through the coils and thus cool the refrigerant. 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. We have had bigger issues to deal with lately with intermittent stalling on the interstate. 08/12/2020 7:40 pm. It’s not always easy to diagnose heater problems. Blend door is jammed/faulty . September 28, 2020. The cold air returns shortly, and the cycle repeats itself for as long as you are driving. The following are some issues that may be causing the heater to blow cold air: Low coolant levels; A plugged/clogged heater core; A faulty thermostat (thermostat that is stuck) Broken blower and/or blower motor It's always good to have some extra juice on hand. Compromised flame sensor. If your car gets stuck and your heater doesn't work—you're in serious trouble. hvac (A clogged heater core can prevent hot air from blowing without causing other problems.) 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. Started happening intermittently, now seems only cold. Simply put, this is a situation when your car’s AC works off and on. Ford Offers to License Its Police “Surveillance Mode” Camera Tech to Other Cop-Car Makers, Ford’s New Cars Will Automatically Watch for Pedestrians, Tesla Wants to Pay Hackers a Full-Time Salary to Break Its Cars. JHinman06 [OP] New Member. If the holdup is by the heater core, then that’s one reason why hot air isn’t blowing. CARS.COM — Why does your car heater blow cold air? why not blowing hot air? 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. Heater valve is jammed/faulty . Related: Tips for Starting Your Car in Subzero Weather. I will show in this video. 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 the car does get up to temperature as it should, there’s probably something else that has gone bad. Also cars use flaps to regulate air mix from heater core (it is in your dash somewhere) to achieve correct temperature. jeepmopar76, … Some days it cold all the time no issues. 14,143 Posts . 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. Reasons Why Your Car Heater Isn’t Blowing Hot Air. Just had it flushed and no change. The heater’s warmth is derived from the coolant circulating around the engine to cool it down. However when I put my foot into it I will start to get heat again. It’s possible that the heater core and other parts are fine, but the computer has grown tired of constantly catering to your climate needs and stopped answering your calls. Do not like cold so ignored. Another way to determine why you are faced with a problem of car air conditioner blowing hot air is to see when the unit blows warm air. Submitted: 9 years ago. Intermittently blew cold/normal. What's going on so We can fix it. If the heater isn't blowing any air, skip to the next section. A fan blows over your heater core and directs warm air into the cabin. The coolant is housed in a … However, if I fiddle around with the temperature control I can get the vents on the passenger’s side to blow warm air. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. Car heater works intermittently? It's no fun getting into your car on a frosty winter's morning only to find the car heater not blowing hot air. Anyone have this happen? Jan 18, 2015 at 12:15 PM #1 #1. 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. Radiator fluid runs through the engine and becomes hot. The coolant absorbs the heat from the engine, causing it to become hot. These time increments can vary in every case, of course, but basically it means that the cold air comes and goes. A broken heater in the winter is far worse than malfunctioning A/C in the summer. Now that it's winter and -17 degrees this morn, my 07 Charger R/T 5.7L AWD is having cabin air heat problem. When I slow down to make a turn sometimes it will blow cold and at times it will not. Checking to make sure the engine warms up properly is number one on the list. This procedure should be done any time the A/C-heater Control is replaced, or if the battery is disconnected or replaced. Radiator fluid runs through the engine and becomes hot. Here's what to do if your vehicle is struggling to turn up the heat. My mechanic seems to think that the head gasket is leaking air into the system, and that the air is preventing the … Many different things can go wrong here causing the whole system to work poorly or not at all. The cooling system thermostat also may be failing to open, preventing coolant from circulating. Average repair cost is $580 at 11,050 miles. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. 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. Another way to determine why you are faced with a problem of car air conditioner blowing hot air is to see when the unit blows warm air. This will make it incredibly difficult for the engine to heat up in cold temperatures since it’s constantly being cooled. 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. 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. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. If your car's blowing cold air when the heat's on, your car's engine coolant could be running low. We took car to dealer and we hope they solved the stalling, but for some reason they didn't get around to looking at AC. (Page 1 of 2) (A clogged heater core can prevent hot air from blowing without causing other problems.) Sometimes it blows out hot air and sometimes it is cold air. One of the more obvious problems would involve the blower fan not pushing any air out of the vents. My car … The ac went out on us about 6 months ago so we had the compressor replaced. 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. Because the hot coolant results from waste heat in the engine block, cabin heat is “free” (by contrast, the car’s air conditioner requires engine power to create cool air, which decreases fuel efficiency). If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. Save cars. Today heat went on then went cool pretty quickly and sporadically went back to heat. 11. When the coolant cools, it goes back to your engine and the whole process starts over. However, it isn’t always the heater that’s to blame. The morning was cool and I was quite irked that it wasn't working and figured I must have blown a fuse. 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. Fly or Drive: Comparing Costs of Road Trip vs. Air Travel. So what happens if your car heater zonks out in mid-January? Driving. I did this procedure and it worked! When you put all the way to hot-cold-hot again, the solenoid can get loose and start working again for a while. The Editorial department is independent of Cars.com’s advertising, sales and sponsored content departments. To help engines warm up fast and then keep it at a steady temperature, manufacturers use a thermostat to control the flow of coolant. Check the coolant level. Sometimes when we have the AC on the vents start blowing warm or hot air instead of cold air. When it's really cold out, the heater blows air that is barely warm. Your Check-Engine Light Is On — How Much Are Repairs Gonna Cost Ya? 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. Discussion Starter • #1 • Jan 2, 2009. Potential causes. 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. After driving for about 10-15 minutes at highway speed it doesn't do it. 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. This is a two-for-one space saver as this jump starter from Anker also serves as a battery back for smartphones. Have an expert inspect your ducts along with the furnace. While idling, the heater blows but doesn't produce hot air. We have adjusted the temperature in the cabin to see if this makes a difference, and it does not. Category: Chrysler. The cruise control doesn't work if the headlights are turned on. 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. service. My Ford F-150 heater is... My Ford F-150 heater is working intermittently. I can start my truck and the temp hand shows around 210 like normal but heater is still blowing cold air, until i begin to drive down road and the air blowing becomes hot. Stupid, I know. November 16, 2020. 3. 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. Buildup of grime is fairly common in coolant systems, so there could be a restriction somewhere. My car has 49000 miles. If I am running defrost it is basically the same hot for a little while and then cold untill i turn it off for a little bit. If I'm on the highway, and keep my RPM above 2500 or so, then the air from the vents will be hot. But if you feel the chill of cold air in your car, even after the engine has been running for some time (and the system is set to hot), then the following issues are likely: Heater core is clogged . I had a Chrysler tech recommend that I re-calibrate the Heater-A/C control. 4. If the thermostat breaks closed, then you’ll have overheating problems, but they’re not designed to break that way. Post Reply. A few weeks after that the ac would intermittently start blowing warm air. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. When the heater is blowing cold air, one or both of the hoses connecting to the heater core do not warm up. The heater blows cold air intermittently regardless of the temperature setting. Any suggestions? No other warning lights are active on the display. The heater in my car is intermittent. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. Sometimes it’s both hoses, other times the hose going in is hot but the other hose is cool. DOUGDARLAND MEMBER; 2005 KIA SORENTO; 2.4L; 6 CYL; 4WD; AUTOMATIC; 130,000 MILES ; I have a few things going on. A/C only blows cold air intermittently. Radiator fluids are topped off where they should be. Answered in 20 minutes by: 10/7/2011. 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. 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. A switch or linkage is faulty . 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. After 10-15 minutes, the heat often peters out and I am getting cold to lukewarm air. 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. Hello, I've searched around on this forum, and another forum, but didn't find exactly … I can set the temp at maximum, in either auto or manual modes and even though the car is obviously warmed up, I get lukewarm or cold air. If the fan has broken, then there certainly won’t be any warm air from the heater core coming your way. The heat that comes through the vents is generated by the coolant being passed through a heater matrix (it's like a miniature radiator) behind the dashboard. A car’s cabin will heat up as the engine’s coolant heats up. This heater core then passes the hot air it generates into the vehicle with a blower fan. Discussion Starter • #1 • Dec 6, 2013 (Edited) Help! At low speeds, the heater blows cold and as we get to a higher speed, the heater gets hot like normal. 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. Replacing a thermostat is a relatively easy DIY project on some cars but can be difficult on others. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. 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. Chrysler Mechanic: jeepmopar76, Chrysler Triple Master Tech replied 9 years ago. This will cause plenty of other issues, but there won’t be enough coolant to sufficiently warmup that heater core as well. Coolant is low . We took it back to the shop and they noted that the compressor was shutting off for some reason. If neither of those is the cause, then the heater core and ancillary components are likely culprits. Plaguing your car out of any snowy conditions however when I put my foot into I. Produce hot air reasons why your car is only blowing cold air Last Post RSS matter its. Is that a door or diverter that is supposed to direct warm air from the heater that ’ reached! Plaguing your car, this is a two-for-one space saver as this jump starter from Anker also serves as fluid! 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