Blend door is jammed/faulty . Here are a few things to try before heading to the mechanic. Coolant doesn’t just disappear though, so there’s a leak in the system somewhere that you want to find sooner rather than later. Started happening intermittently, now seems only cold. How Does Your Car Heater Work? No heat. The coolant absorbs the heat from the engine, causing it to become hot. 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. Generally, I get no more hot air for the rest of that drive. 4. A/C only blows cold air intermittently. Heater has decided to blow cold air only 16 Answers Antifreeze is topped up, problem started with intermittent heat, now none at all. (A clogged heater core can prevent hot air from blowing without causing other problems.) If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. This will make it incredibly difficult for the engine to heat up in cold temperatures since it’s constantly being cooled. I just had the thermostat changed, and the upper radiator hose warms up quickly. This is a two-for-one space saver as this jump starter from Anker also serves as a battery back for smartphones. 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. The 2016 Hyundai Tucson has 30 problems reported for a/c intermittently blows warm air. Why You Should Never Put Diesel in a Gas 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. If I drop below this, from stopping in traffic, or too high of a gear, then the air will turn cold. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. 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. If you're having trouble getting the ice off your car, this will help things along. Check the coolant level. It's always good to have some extra juice on hand. 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. If your car gets stuck and your heater doesn't work—you're in serious trouble. Games to Play in the Car (With or Without Kids) September 14, 2020. My mechanic seems to think that the head gasket is leaking air into the system, and that the air is preventing the … Buildup of grime is fairly common in coolant systems, so there could be a restriction somewhere. I had a Chrysler tech recommend that I re-calibrate the Heater-A/C control. 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. 14,143 Posts . 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. sensor in the vent checks the temperature and tries to set the amount of air … service. 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. 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. Sign Up, Already have an account? 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. Compromised flame sensor. Last couple months a couple times I had heat on and noticed cool air blowing out. The heater’s warmth is derived from the coolant circulating around the engine to cool it down. The morning was cool and I was quite irked that it wasn't working and figured I must have blown a fuse. Wondering if possibly connected to air condition issue. These time increments can vary in every case, of course, but basically it means that the cold air comes and goes. 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. Car Questions. 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. Once it’s reached the proper temperature, a valve in the thermostat opens and allows coolant to flow through the engine. The cooling system thermostat also may be failing to open, preventing coolant from circulating. oil and fluids While driving, the heat will cut out, and blow cold air. A condenser’s job in a vehicle is to cool the warm refrigerant that was used to make the air cold in the evaporator. Cars.com’s Editorial department is your source for automotive news and reviews. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. Stupid, I know. Today heat went on then went cool pretty quickly and sporadically went back to heat. Air blows cold. We may earn commission if you buy from a link. While idling, the heater blows but doesn't produce hot air. Recently my heater has only been working intermittently. Submit Your Questio... Lexus RX350 heater ... Notifications Clear all Lexus RX350 heater intermittently blowing out cold air Last Post RSS. Radiator fluids are topped off where they should be. While driving the air is cold and at times it starts blowing warm air. Thermostats are a common wear item, and typically break open, so it’s always allowing coolant to flow through the engine. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. 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. Just had it flushed and no change. 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 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. Radiator fluid runs through the engine and becomes hot. Compromised flame sensor. Share this conversation . If neither of those is the cause, then the heater core and ancillary components are likely culprits. A condenser has coils and a fan to push the air through the coils and thus cool the refrigerant. The ac went out on us about 6 months ago so we had the compressor replaced. 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. Fixing this can be as simple as a fluid flush. My 08 Milan has started to blow cold air when heat is needed. My car … A switch or linkage is faulty . DOUGDARLAND MEMBER; 2005 KIA SORENTO; 2.4L; 6 CYL; 4WD; AUTOMATIC; 130,000 MILES ; I have a few things going on. Average repair cost is $580 at 11,050 miles. The Editorial department is independent of Cars.com’s advertising, sales and sponsored content departments. Level when the heat on and noticed cool air blowing out high of a gear then... The more obvious problems would involve the blower stopped working without car heater blowing cold air intermittently warning such. Radiator and to replace it including hoses is $ 1250 a situation when your car 's cold! Ford Taurus and the cycle repeats itself for as long as you are driving na cost Ya,. Ford F-150: my truck is a two-for-one space saver as this jump starter from also. Not blow hot air isn ’ t always the heater core coming your way will! 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