I work in the telephone business and am very familiar with DC wiring. 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. Changing your home’s filters regularly can improve your indoor air quality and may also keep you from experiencing problems with your central heating. Make sure the air filter has been cleaned in the last 30 days. Dodge owners manual shows the 40 amp blower fuse, #25, but does not mention any blower relay in the PDC. Air Conditioners Heat and Cool Unit: Not Heating Properly. 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 the home’s thermostat detects that the living space is warmer than its programmed temperature level, a cooling cycle begins. Repair guides and support for home heating, ventilation, and air conditioning system repair. To diagnose heating, ventilation and air conditioning problems, start with the easy, visible items and work your way to the hidden components. If it's not blowing hot air check the following: Coolant/air lock Is the coolant at the correct level? Dirty Filters. Haynes say it is located in the PDC under the Hood, along with a 40 amp blower fuse in the PDC. I turn on the heater on my Amana heater and a/c unit and only blows cold air, it seen to be working good but does not heat. WARM/HOT – This means your reversing valve may not be configured or wired properly. There are several things you can do to optimize the heating effectiveness of your unit: Make sure the mode switch or selector switch is set to HIGH HEAT and the Temperature Control to a higher number. jose lopez. And, in cold weather, heat pumps tend to blow warm air out at 95°F. Blockages can not only reduce its effectiveness but also pose a fire hazard. While that’s warm enough to raise the temperature of your home, it … Contact Support at 1-855-733-5465 to find a pro-installer in your area. Faulty Heater Fan. Many people have experienced the very uncomfortable and inconvenient phenomenon of a system blowing warm air instead of cold. The ventilation fans blow air over the matrix and into the car. Your heat pump may be working fine, but the air just feels cool to lukewarm. Your home’s filters can collect dust, and if they can get too dirty, they can block the flow of air. 1Kw of electrical heat will provide the same level of heating no matter what type of heater, where it all goes wrong with blown air systems is the designers taking the air pipe under the floor of the van and made much worse by lack of any proper insulation, where with a bit of layout compromise they could keep the pipe entirely withing the van. Blower Won't Work on Central Air. 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