38 Questions View all . Blockages can not only reduce its effectiveness but also pose a fire hazard. Haynes say it is located in the PDC under the Hood, along with a 40 amp blower fuse in the PDC. To diagnose heating, ventilation and air conditioning problems, start with the easy, visible items and work your way to the hidden components. I work in the telephone business and am very familiar with DC wiring. Dirty Filters. While that’s warm enough to raise the temperature of your home, it … 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. Here’s why: The average body temperature is around 98.6 °F. 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. 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. 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. When the home’s thermostat detects that the living space is warmer than its programmed temperature level, a cooling cycle begins. COLD – This means your thermostat is cooling correctly, but the heating isn't working properly. 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. Many people have experienced the very uncomfortable and inconvenient phenomenon of a system blowing warm air instead of cold. Blower Won't Work on Central Air. Top Reasons Central Heat doesn’t Work Of course, any central residential HVAC system is supposed to provide cool air when it’s warm outside and heat when the outside temperature drops. And, in cold weather, heat pumps tend to blow warm air out at 95°F. The ventilation fans blow air over the matrix and into the car. Make sure the air filter has been cleaned in the last 30 days. Your home’s filters can collect dust, and if they can get too dirty, they can block the flow of air. If it's not blowing hot air check the following: Coolant/air lock Is the coolant at the correct level? Repair guides and support for home heating, ventilation, and air conditioning system repair. Contact Support at 1-855-733-5465 to find a pro-installer in your area. Faulty Heater Fan. 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