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Air conditioner and heat only blowing through defrost vents and back only blowing hot air

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Sounds like you have an a/c hose disconnected. Check for all loose connections.

Posted on Aug 04, 2008

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1 Answer

Heater blows hot air then keeps blowing cold air whats wrong with it


This is a heat pump so the problem could be anything related to the compressor, refrigerant circuit, etc. or the defrost control. There is usually a switch or screwdriver slot switch on the front of the unit when you take the large cover off. This will force the auxilliary heat on regardless of outdoor air temp, thus bypassing the compressor heat pump system (and costing you more to operate it.)

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What's going on -- Vents are blowing hot air and


It sounds like the unit is stuck in the heat mode or the thermostat switch is still on heat. If the switch is in cool then you can go to the outside unit and locate the reversing valve. It may be stuck in the heat position. You can tap it with the handle of a screwdriver but only on the ends and very lightly because if you dent it the valve will be stuck for sure. If it shifts you will hear a loud hiss as the pressure equalizes. You could also try unplugging it from the circuit board. On some units it is energized in the cool mode and on others it is energized in the heat mode.

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I have a 2004 Chevy Tahoe with dual zone air conditioning plus rear air conditioner. My problem is on the 2 driver vents only it keeps going from cool air to hot air. After you drive for a while it is all...


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Our AC (Heat pump)is blowing hot air in the afternoons as the temperature outside rises. We have had the freon checked and it is okay. The AC will blow hot air for about 30 minutes then blow cool air. Our...


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when the coils freeze up , from intake of outside air, when using the heat pump mode, the unit will try to defrost the coils before going back to heat mode. mine did this alot. does it kick back to heat after a few mins? also after 2 years , mine started having issues with the exhaust blower control and would go into warp mode and bang noise.seems like common issues for this unit.whether the amana, or haier version.

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Does it look like the coils are frosting over? Is it steaming? Keep watching, after about 30 min does the fan come back on?

If yes to any/all the above then the unit is probably in defrost mode and yes the fan will stop blowing during that time, but restart when the unit goes back into regular heat mode.

During this time you will likely notice warmer heat from the vents than normal and the "AUX or EM HEAT" light will be on.

That is your backup heat system. It should automatically come on during a defrost cycle.

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Caerrier weather maker 8000


Your cooling coil may be frozen. Turn the fan on and the cooling to off so air will circulate to defrost the coil. After air circulation is re-established in about 90 minutes turn the cooling back on. Operate the system with the fan on when in the cooling mode should eliminate the freezing problem.

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