Problem: Heater is blowing cold air. At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. I tried bleeding the system and got some air out. why not blowing hot air? Owner & Student. Consult an HVAC expert for advice. The by-product of the heat pump system is cold air that is approximately 3-5 degrees cooler than the ambient air around the GeoSpring. It's heating the water just fine, and is a new hot water heater. Hi allMy own car Golf tdi 2013 59000 mls not climate control Heater started blowing cold air, coolant up to the mark, no ... reduces as the blower speed is increased. A faulty water pump; 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. Help! There are specific areas that you can check if your car heater is blowing out cold air: 1. 1. In a dual zone system, you wind up with a blows cold one side, hot on other side condition. Or the gas line isn’t supplying enough gas to your furnace. GeoSpring Hybrid Electric Water Heater Blowing Cold Air. Here’s another possible DIY fix for your heater blowing cold air. This can cause your furnace to lock down for safety. The first thing to check if you experience a cold blowing heater is to check the quantity of coolant in the engine compartment. Posted 12-22-14 in Heating. Try changing the batteries. High School or GED. Alexandria, VA Heating and Cooling experts share some common problems people can check to see if they have a broken heater. Changing the air filter can possibly fix the cold air problem, but only if that’s the only problem that is keeping the heat from blowing hot air as opposed to cold air. car heater does not work, blowing cold air. Oct 15 2012, 12:37pm . Joined: Dec 5, 2011 Posts: 1,734 … 3,214 satisfied customers. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. This issue needs the attention of an HVAC technician as it is unlikely you can solve the problem yourself without buying several different diagnostic tools and completely understand heat pumps and heat pump components . There are many issues that can cause your heater to blow cold air. Air Conditioning . If the fan is blowing cold air then the fuse is fine, the water flow valve to the heater matrix cold be frozen or seized or there cold be an airlock in the pipes that feed the matrix.Some cars have bleed valves on the matrix flow and retun pipes to allow the air to be removed, usually peugeot and citroen. Druim Well-Known Member. 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. The furnace air filter is … Schedule Now. I could feel the temperature change on the upper half of the core (got hotter), but the bottom half of the core stayed cold. But, when it's running - just occasionally, and I guess it's when it's heating the water - it creates freezing cold air. If it’s where it’s supposed to be, proceed to step 2. The loud hoover noise is the radiator cooling fan cutting in because it senses the engine is too hot. Heater cores are typically situated directly in the back of dashboards. Check the Pilot Light on Gas Furnaces. If this is the case, you’ll have to replace it with a part that has the same voltage and wattage. Air in Hot Water Pipes Only. 2. If the holdup is by the heater core, then that’s one reason why hot air isn’t blowing. Check the furnace’s air filter. Before we help you diagnose the problem, let’s make sure there is actually a problem. MariusRR, Jan 26, 2014 #1. See Our Service Areas . And when you look at how the heater core is positioned in the air box assembly, the bottom half of the heater core is the side that feeds the driver side. 2. ), so the temperature actuators generally fail first. Inadequate gas supply. The ventilation fans blow air over the matrix and into the car. If you did it yourself instead of calling a professional, you may have chosen a thermostat that’s not compatible with your heating system. Ben on April 24, 2016: I have a 1997 honda civic lx 1.5 5 speed and it blows cold air and overheats. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. Have you installed a new thermostat lately? If you clear any debris or blockage and the problem persists, you could have a faulty heating element. Air valve? 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