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MY HEATER BLOWS HOT AIR THEN BLOWS COLD THEN HOT THEN COLD,ICHANGED THE MOTHER BOARD, RELAY SWITCH, AND THERMOSTAT, IT IS RUN FROM A HEAT PUMP WITCH I HAD CHECKED AND IT WORKS FINE

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I have a lux electric thermostat my furnace will blow out heat for about one hour to maybe three then it will start blowing cooler air,I then cut it off for thirty seconds or longer once I do that it will start blowing out heat again then it will repeat it self again what could be the problem.

Posted on Feb 19, 2010

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If you have a heat pump that produces heat for a while and then cold for a while and then back to heat without resetting anything, then your problem is most likely in the defrost mode.


When your heat pump goes into defrost mode, it essentially switched the heat pump from heating to air conditioning to melt any ice accumulation on the heat pump itself. To compensate the cool air, you electric heat strips come on and make the air more of a room temperature.


Be sure that your heat strips come on during the defrost mode. And keep in mind that a heat pump will not produce an extreme amount of heat.

Posted on Jan 08, 2010

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Blows cold air turn heat on


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Heater temp on high only bows luke warm air after driving. A/C works just fine.Plenty of cold air from it


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1997 E350 Eldorado bus passenger heater blowing cold air


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The heater in my 2002 dodge dak. 3.9 wont heat,it blows warm air, ichanged thermostat and flushed rad.Someone said try swiching water (heater) hoses.


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HEAT BLOWS COLD AIR WHEN IDLING ONLY GETS HOT WHEN START DRIVING


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1 Answer

Air conditioner is blowing hot air, it was installed 1995 , the top switch option is CONT FAN AUTO and bottom switch is HEAT OFF COOL and on the right is a dial from 10-30


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1 Answer

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