Heater cores are typically situated directly in the back of dashboards. A faulty blower motor. The heater not working in some cases may be related to the overheating problem you are also having. At the simplest level, there are two main reasons why the heater is not working. In this article, we will focus on heating system problems that cause the heater to blow cold air. A heater core is responsible for a vehicle’s defrosting and heating actions. Arlind86, Thanks for posting these instructions. Since the heater core is often the high point in a cooling system, air can move into it … My heating and cooling appliance isn’t blowing air! Contacting a heater service professional to service your ductwork will help in restoring the efficiency of your heating system. Just like your smartphone’s battery can heat up and lead to phone problems, an overheated furnace can produce similar results. Dirty and Clogged Air Filters A dirty air filter reduces the efficiency at which air flows over the heat exchanger of the furnace. 2007 Mini heater blowing cool air Hello Huntdiane and all, I too have a 2007 Mini Cooper with heater problems. Some vehicles have a valve installed in the heater core inlet line. CAUSE: Another common reason for room heater not blowing hot air is broken heater coil. An HVAC technician can help you with the sizing. Problems with your vents or ductwork are likely to blame. !Cold air blowing out of heater vents!! Rotated all the PDC relays around, they have the same ID, other than ABS pump. I have a 2008 S550 that I recently bought, this was the first time I drove it in the winter cold weather, the heat was always working but after driving to the store I parked the car in the parking lot and the heat suddenly stop working, it was only blowing cold air. ... As though that isn’t difficult enough, a heater that isn’t blowing air through the vents can be caused by several different factors, depending on the type of heater (electrical heater, heat pump or gas furnace) and the quality and cleanliness of the vents. Think of it like trying to pour a thimble of hot water on a glacier. Discussion Starter • #1 • Jan 8, 2014. Another common problem is when air gets into the cooling system. Is your furnace blowing hot air in some rooms but not in others? skoda octavia heater not blowing hot air - heater core replacement If the valve is stuck closed, that may also answer the question, is your Toyota car heater blowing cold air. If debris has caused a clog in the heater core, it will need to be replaced. Q: Why Is My Car Blowing Cold Air When the Heat Is On? Blower still does not work. 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. Call Bigham’s One Hour Heating and Air Conditioning for furnace repairs for the cities of Santa Rosa and surrounding Sonoma County. Why is the Heater Not Blowing Hot Air? If the fan isn’t working, you probably need to … Heater Stopped Blowing Hot Air. Major 5 Reasons That Are The Reason Behind Your Car Heater Blowing Cold Air 1. Problems with the vehicle’s heating system can be either heater blowing cold air or coolant is not flowing through the heater core. 5. 7 Posts . Blower still does not work. I purchased a 2003 Focus SVT about 2 months ago and just noticed yesterday during a chilly morning that the heat doesn't seem to blow hot air… 9 Posts . A kink in the heater hose is preventing the proper flow of water through the heater core. In some cases, the problem might have nothing to do with coolant: If your blower only works on the highest setting, your blower motor control module probably needs to be changed. An electric heater works on the same principles as any other type of machinery. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. A: Your heater is broke! It now has 96,000 miles and I have just started having this problem. At the simplest level, there are two main reasons why the heater is not working. If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue. Heater will not blow out hot air bottom or top vents when ideling or low speeds even after driving for and hour. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. Discussion Starter • #1 • Aug 27, 2015. A/C Not Blowing Air. If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue. You might think that a heater blowing cold air is not a common problem for a Santa Clarita heater repair company, but this one was emailed to us by Jeff over in Redlands where it can get quite chilly in the evenings, especially in the winter. You’ll know this is the problem if no air comes out of the vents when you turn on the heater. The odds of it not working suggests that something went wrong with it. Checked most fuses for continuity in the PDC and Junction Box and they are okay. The blower motor itself does not create the heat; rather it blows the heated air created by the furnace through the system's ductwork. Does it seem like the airflow is weaker than you remember? If the heat is blowing, but blowing cold, it has something to do with the coolant getting to the heater core, or the heater core itself. A car heater blowing cold air could be a symptom of the failure of the heating unit. It ended up being a leak and it was coming from the radiator cap. The heater core is clogged from debris in the cooling system. This heater core then passes the hot air it generates into the vehicle with a blower fan. If your furnace is the wrong size then you will need to get a new furnace. To warm your cold inside air, the heat pump’s outdoor unit uses liquid refrigerant to absorb heat from the outside air. Consider the air ducts. If the heater isn't blowing hot air at you when you turn the system on, the blower fan might have a problem. I have a 2008 535I Sport sedan with 100k miles on it. When heating and air conditioning strays from that pattern, the system communicates internal problems in subtle ways. If the heat is blowing, but blowing cold, it has something to do with the coolant getting to the heater core, or the heater core itself. HELP! There could be various reasons for car heater not working but it basically happens for two reasons: air from the blower is not blow toward the heater core or the coolant does not flow through the heater core. Take a look at the air vents and make sure that the dampers (the little handles on the front panel) are parallel with the ductwork. This would not result in a heater blowing cold air, however, and would be an entirely different problem. There is a specific way that the central air system was designed to condition air. SOLUTION: Check if there are any breaks in the line after opening up the case. Jump to Latest Follow 1 - 20 of 20 Posts. If you have recently installed a new water heater, or had electrical work done, it is quite possible that the furnace circuit breaker was turned off and is the cause of your furnace problem, so simply go to your main circuit breaker panel as the next step. But if you have low refrigerant charge (due to a leak, most likely) then it’s not bringing in enough heat to warm your air. Q: How Much Is a New Heater Core? Checked continuity of 40 amp blower fuse; it's okay. I read the manual and it said that it was a hot water switch or a leak in the cooling system. The blower fan located behind the dashboard pushes air through the climate control vents. If the car’s heater is blowing cold air at idle, you should first check the coolant level, and its condition, completing the coolant level is the easiest way but not always the best way to fix this issue. For more information on reasons to get your ductwork cleaned, click on the link below: Coolant Isn't Enough A: Heater cores generally run between $100-$300. Need help! 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. Car Heater Not Blowing Hot Air: A Bad Blower Fan Motor. The wires together work as a complete circuit and in case any of them snaps from the constant heating and then cooling then the circuit may get broken and may stop giving off heat. If you think this is the issue, please call 888-757-0997 for immediate assistance. (707) 703-5795 Hi I had the heater problem on my XJ8, there is a fuse that controlls the heater pump and the alarm sound moduel I think it n/o 10 (check your workshop manual), if when you activate the alarm by using the key fob and the bleep does not bleep this will be your problem, what happens is the moduel gets water in it and fuses, you need to disconect then replace the fuse. Rotated all the unmarked relays around in the junction box. Next, you need to check the water pump, thermostat, heater’s radiator, heater’s tap, presence of air … If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. 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