This procedure should be done any time the A/C-heater Control is replaced, or if the battery is disconnected or replaced. Have an expert inspect your ducts along with the furnace. Also cars use flaps to regulate air mix from heater core (it is in your dash somewhere) to achieve correct temperature. You’ll want to flush it several times with water to get all the sediment and build-up out of the heater core or blockage area. It might blow comfortable cold air for 30 minutes and then go back to blowing warmer air. 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. 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). My car has an automatic transmission. 08/12/2020 7:40 pm. A fan blows over your heater core and directs warm air into the cabin. Sometimes it will leak water on the front passenter side under the console … read more This will cause plenty of other issues, but there won’t be enough coolant to sufficiently warmup that heater core as well. In many cases this type of problem can be caused by a faulty HVAC control head or intermittent blend door actuator or low coolant. 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. After driving for about 10-15 minutes at highway speed it doesn't do it. We have a 2010 honda Odyssey and we are experiencing some air conditioning problems. If neither of those is the cause, then the heater core and ancillary components are likely culprits. These time increments can vary in every case, of course, but basically it means that the cold air comes and goes. 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. One of the more obvious problems would involve the blower fan not pushing any air out of the vents. 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. Anyone have this happen? In the latter case, there’s a good chance your engine will be running hot and be in danger of overheating. Schedule an appointment online or stop by your nearest location today! 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. Car Questions; Ford Repair; Ford F-150: My Ford F-150 heater is working intermittently. If the car does get up to temperature as it should, there’s probably something else that has gone bad. Dealer said coolant leading from radiator and to replace it including hoses is $1250. Check the coolant level. 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. 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. While idling, the heater blows but doesn't produce hot air. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. We took it back to the shop and they noted that the compressor was shutting off for some reason. Why You Should Never Put Diesel in a Gas Car . Here's how: Turn the ignition switch to the ON position. Heater has decided to blow cold air only 16 Answers Antifreeze is topped up, problem started with intermittent heat, now none at all. jeepmopar76, … 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. 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. Recently my heater has only been working intermittently. Meanwhile both passenger’s side vents are blowing cool air. However, it isn’t always the heater that’s to blame. The coolant absorbs the heat from the engine, causing it to become hot. The heater’s warmth is derived from the coolant circulating around the engine to cool it down. Related: Tips for Starting Your Car in Subzero Weather. This coolant is then routed through a “mini” radiator called a heater core. You may be able to find more information about this and similar content at piano.io, How to Clean Your Gross, Gunk-Filled AirPods, How to Zip, Unzip, and Encrypt Your Files. It's no fun getting into your car on a frosty winter's morning only to find the car heater not blowing hot air. A different reason for the heat to not work would be a lack of coolant going through the engine. Generally, I get no more hot air for the rest of that drive. Share this conversation . 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. Discussion in '2nd Gen. Tacomas (2005-2015)' started by JHinman06, Jan 18, 2015. When the coolant cools, it goes back to your engine and the whole process starts over. Radiator fluid runs through the engine and becomes hot. Have an '05 HL (non-limited) and we were running the heat at the low fan speed setting the other day. JHinman06 [OP] New Member. 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. 2. 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. My mechanic seems to think that the head gasket is leaking air into the system, and that the air is preventing the … A condenser’s job in a vehicle is to cool the warm refrigerant that was used to make the air cold in the evaporator. Sign Up, Already have an account? These time increments can vary in every case, of course, but basically it means that the cold air comes and goes. 4. 4. 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 always good to have some extra juice on hand. WHY MY CAR HEATER DOES NOT BLOW HOT WARM AIR. Reasons Why Your Car Heater Isn’t Blowing Hot Air. It might blow comfortable cold air for 30 minutes and then go back to blowing warmer air. 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. My 08 Milan has started to blow cold air when heat is needed. Faulty Heater Fan. 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. Fortunately I also have heated seats so I was happy that they were giving me some heat. Ask Your Own Chrysler Question. If you're having trouble getting the ice off your car, this will help things along. Sometimes when we have the AC on the vents start blowing warm or hot air instead of cold air. When your car A/C blows cold then warm, head to your nearest Firestone Complete Auto Care. 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. My friend thinks I am a car-god. hvac Save cars. If the fan has broken, then there certainly won’t be any warm air from the heater core coming your way. Average repair cost is $580 at 11,050 miles. Blend door is jammed/faulty . The ac went out on us about 6 months ago so we had the compressor replaced. 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. 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. 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. When I slow down to make a turn sometimes it will blow cold and at times it will not. Gear-obsessed editors choose every product we review. It's almost as unpleasant to have a heater that's not giving out enough heat. This heater core then passes the hot air it generates into the vehicle with a blower fan. A switch or linkage is faulty . Chrysler Mechanic: jeepmopar76, Chrysler Triple Master Tech replied 9 years ago. The morning was cool and I was quite irked that it wasn't working and figured I must have blown a fuse. Sometimes it blows out hot air and sometimes it is cold air. If your car's blowing cold air when the heat's on, your car's engine coolant could be running low. We have adjusted the temperature in the cabin to see if this makes a difference, and it does not. The coolant absorbs the heat from the engine, causing it to become hot. If the engine is cold, the thermostat will restrict the flow of coolant into the engine, allowing it to warm up quickly. Radiator fluids are topped off where they should be. Jan 18, 2015 at 12:15 PM #1 #1. There is likely a problem with your condenser. My car … The taillights go out when the brakes are applied. 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. Best Winter Drives in Each Region of the USA. 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. If the heater isn't blowing any air, skip to the next section. When the coolant cools, it goes back to your engine and the whole process starts over. The passenger side of the car is getting no/some heat. Discussion Starter • #1 • Jan 2, 2009. 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. 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. When driving, an engine typically takes about 5-10 minutes to reach its proper temperature. I do notice that if I run the car at faster speeds I can get the air temperature to increase, but that is usually temporary, especially if I come to a stop and just idle. After 10-15 minutes, the heat often peters out and I am getting cold to lukewarm air. Compromised flame sensor. A car’s cabin will heat up as the engine’s coolant heats up. Or diverter that is supposed to direct warm air enough coolant to flow through the and. 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