Question about Desa International Comfort Glow Infrared Vent-free Gas Space Heater

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Comfort zone infrared heater cz-1500wo runs, but blows cold air

My infrared heater runs, but there's no warm air coming from it, no matter what the temperature is set at.

Posted by barbiel143 on

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Scott Corey-reid

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Lack of actual heat transfer

Posted on Dec 05, 2013

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1 Answer

Why does fan come on right away before heater warms up?


What you describe is true for many home heaters, but maybe not true very often for cars. For most cars - especially older ones, the fan speed is independent of the engine temperature, and the heater will not "blow warm" until the engine has warmed up. There are also many new cars that let you set a temperature, and then automatically change the fan as appropriate. Those have many different behaviors, but in order for others to provide help I think it might be helpful if you said which model and year car you were asking about.

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Heat not working


Sounds like the air blend door is not opening to let heat in.

Engine coolant is provided to the heater system by two 16 mm (5/8 inch inside diameter) heater hoses. With the engine idling at normal running temperature, set the heater-A/C controls as follows. Temperature control to full Heat, Mode control to Floor, Blower control to the highest speed setting. Using a test thermometer, check the air temperature coming from the center floor outlets and compare this reading to the Temperature Reference table.

If the floor outlet air temperature is insufficient, check that the cooling system is operating to specifications. Both heater hoses should be HOT to the touch (the coolant return hose should be slightly cooler than the supply hose). If the coolant return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in heater system.

POSSIBLE LOCATIONS OR CAUSE OF OBSTRUCTED COOLANT FLOW
If coolant flow is verified and the heater floor outlet temperature is insufficient, a mechanical problem may exist.

POSSIBLE LOCATION OR CAUSE OF INSUFFICIENT HEAT
  • Obstructed cowl air intake.
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TEMPERATURE CONTROL
If heater floor outlet temperature cannot be adjusted with the heater-A/C control temperature control lever, one of the following could require service:

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2 Answers

Duraflame heater runs for 5 mins and shuts off


try cleaning off the filter that is on the bottom in the back of the unit. It is a fail safe sensor that in the event the unot overheats it shuts off the heater. Worked for me on mine.

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Is it set on summer switch which is the fan running all the time blowing cold air

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try skewing the engine coolant temperature sensor with a multi-meter and a temp vs resistance or voltage chart. the ect could be out of range and not set a code. also check actual engine temp with an infrared thermometer. hope this helps

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does the heater core get hot, check the coolant hoses going to the core to see if both are hot, if they are U have a air temperature control blend door problem, most likely the actuator for the door has failed.

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