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The blower stays on constantly - Heating & Cooling

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  • tommy Nov 04, 2012

    The blower will stay on and continues to run after temp is meet


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Defective thermostat

Posted on Nov 06, 2012

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2009 F-150 Lariat Blower stays on all the time what should I check?

Probable cause that the blower motor continues is that the power supply is constant. The only time that the blower motor is off is when you actually turn the heater/Air conditioner switch off. The blower remains on all the time if you are only using the fan controller as this only controls blower speed.

Check to make sure that the controller is working properly. Is this a 2009 Lariat? or a 1997 F150? I have a controller for the 1997,

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Air sounds like it is on when i start my van

blower relay stuck with the contacts closed sending constant current to the blower. replace blower motor relay.

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2003 GMC Envoy main blower fan runs constantly

Does the fan stay on even with the ignition key off? Do you have automatic heating and air conditioning controls? Automatic controls have a light up blue screen in the middle of the temperature controls, and there will be a button that says "Auto". If you do have automatic controls, the likely culprit of your fan staying on constantly is what is called the blower control processor. The blower control processor is a small computer that replaces the blower resistor commonly found in cars. When the blower control processor fails, it usually "sticks" on. It's not a cheap part, but is easy enough to replace if you're handy with basic hand tools and comfortable unplugging electrical connectors under the glove compartment area.

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Heater blower will not shut off even when car is shut off

replace the blower motor module located under the dash on the passenger side near the blower motor. The module has a constant power supply to the high side relay. if the relay sticks the blower stays on all the time. Replacing the module is the usual fix.

Oct 31, 2012 | 2005 Chevrolet Impala

1 Answer

Flame turns off rematurely

That is normal. The gas does not stay on constantly. That would burn the clothes. The gas assembly is controlled by a Klixon mounted on the blower housing. As the air comes through the blower The Klixon also known as the cycling thermostat judges air temp and turns the gas assembly on and off. Here is a video explanation:

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I have a 1979 oldsmobile delta88 for several years.My blower motor stays on and blows at a constant low speed and doesnt blow much on high.I already replaced sll components except for thewhole a/c switch...


Aug 25, 2011 | Oldsmobile Delta 88 Cars & Trucks

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Furnace blower stays on constantly, only goes off when I tap the side of the furnace. Burner cycles through fine, but the fan just won't shut off.

Sounds like a bad blower switch or relay. Without a make or model number of your heating system I can only guess.

Jan 14, 2010 | Heating & Cooling

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2003 Chevy Trailblazer my AC blower won't turn off!

you have a short to power which will cause it to stay on constantly check your blower motor resistor pack to ensure that it is working and check the wires going to the blower to make sure you have a power and a ground

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Aprilaire 760 keeps running.

The humidifier should not turn on untill the furnace blower starts. Since the fan stays on. does the solenoid valve also stay on? If they both stay on you probably have a bad humidistat. If only the blower stays on then the circuit bourd in the humidifier is defective.
Good luck
HVAC Teacher

Feb 06, 2009 | Aprilaire 700 Humidifier

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