These time increments can vary in every case, of course, but basically it means that the cold air comes and goes. Jan 18, 2015 at 12:15 PM #1 #1. One of the more obvious problems would involve the blower fan not pushing any air out of the vents. If the thermostat breaks closed, then you’ll have overheating problems, but they’re not designed to break that way. Submit Your Questio... Lexus RX350 heater ... Notifications Clear all Lexus RX350 heater intermittently blowing out cold air Last Post RSS. Have an expert inspect your ducts along with the furnace. 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. JHinman06 [OP] New Member. 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. In line with Cars.com’s long-standing ethics policy, editors and reviewers don’t accept gifts or free trips from automakers. While driving, the heat will cut out, and blow cold air. 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 The A/C only blows cold air once in a great while and only for a short time. Fortunately I also have heated seats so I was happy that they were giving me some heat. Heater valve is jammed/faulty . 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. I just had the thermostat changed, and the upper radiator hose warms up quickly. 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. Your Check-Engine Light Is On — How Much Are Repairs Gonna Cost Ya? Fixing this can be as simple as a fluid flush. Coolant doesn’t just disappear though, so there’s a leak in the system somewhere that you want to find sooner rather than later. Greetings; The wife's 2008 RX350 is having intermittent issues with the heater. Also, while driving suddenly it stops heating and just blows out cold air. Heater intermittently blowing cold air. HEATER BLOW COLDIn this video we will explain the reasons why your car heater might blow cold air. 1. 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. Related: Tips for Starting Your Car in Subzero Weather. The ac went out on us about 6 months ago so we had the compressor replaced. This heater core then passes the hot air it generates into the vehicle with a blower fan. Car Questions; Ford Repair; Ford F-150: My Ford F-150 heater is working intermittently. 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. I had a Chrysler tech recommend that I re-calibrate the Heater-A/C control. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. 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. 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. A car’s cabin will heat up as the engine’s coolant heats up. A fan blows over your heater core and directs warm air into the cabin. The 2016 Hyundai Tucson has 30 problems reported for a/c intermittently blows warm air. A/C only blows cold air intermittently. Ask Your Own Chrysler Question. jeepmopar76, … CSI: Car Smell Investigation, 2020 Hyundai Palisade Edition, Tips for Starting Your Car in Subzero Weather. Buildup of grime is fairly common in coolant systems, so there could be a restriction somewhere. The morning was cool and I was quite irked that it wasn't working and figured I must have blown a fuse. 19 Posts . My car … 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. Topic starter Greetings; The wife's 2008 RX350 is having intermittent issues with the heater. Log In. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. Joined: Jan 18, 2015 Member: #146633 Messages: 4 Gender: Male Versailles, KY Vehicle: 06 Reg Cab 4 Cyl. A broken heater in the winter is far worse than malfunctioning A/C in the summer. This procedure should be done any time the A/C-heater Control is replaced, or if the battery is disconnected or replaced. 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. 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 . We have had bigger issues to deal with lately with intermittent stalling on the interstate. Have an '05 HL (non-limited) and we were running the heat at the low fan speed setting the other day. When it's really cold out, the heater blows air that is barely warm. Blend door is jammed/faulty . 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. It's no fun getting into your car on a frosty winter's morning only to find the car heater not blowing hot air. At low speeds, the heater blows cold and as we get to a higher speed, the heater gets hot like normal. 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. Potential causes. 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. It's almost as unpleasant to have a heater that's not giving out enough heat. Thermostats are a common wear item, and typically break open, so it’s always allowing coolant to flow through the engine. The ventilation fans blow air over the matrix and into the car. 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. 4. 11. 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. Coolant is low . If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. 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. Another possibility is that a door or diverter that is supposed to direct warm air into the interior is stuck, preventing proper airflow. Games to Play in the Car (With or Without Kids) September 14, 2020. why not blowing hot air? I play with the thermostat, blend door functions etc. A condenser’s job in a vehicle is to cool the warm refrigerant that was used to make the air cold in the evaporator. I did this procedure and it worked! When the heater is blowing cold air, one or both of the hoses connecting to the heater core do not warm up. It might blow comfortable cold air for 30 minutes and then go back to blowing warmer air. Radiator fluid runs through the engine and becomes hot. We have adjusted the temperature in the cabin to see if this makes a difference, and it does not. No, your car didn’t get confused and turned on heat by accident. The blower stopped working without any warning, such as hearing a noise or working intermittently. This will make it incredibly difficult for the engine to heat up in cold temperatures since it’s constantly being cooled. Radiator fluids are topped off where they should be. First, check the coolant level when the engine is cold. 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