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Fan cuts on and off repeatedly when heater is on

I have no problems when the ac is on cool, but when it's on heat, the fan cuts on and off repeatedly. This started about 4 days ago. I've changed the thermostat wjth no improvement.

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  • Anonymous Jan 30, 2009

    Fan cuts on and off repeatedly when heater is on problem, and notify you when a new solution is offered.

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Either the circuit board or the relay that controls the fan in heating is dropping the fan out. it probably uses a different blower speed for cooling than for heating.. you'll need a meter to check if it is losing power.

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Posted on Jan 16, 2009

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Posted on Jan 02, 2017

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2 Answers

2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

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basic-thermostat-wiring-diagram-czwsw2ci0layswcsyy3dj4dr-4-5.jpg

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Fan doesn't work in heat mode it works on all other functions. Heat does come out but fan doesn't kick in. Outside unit is operating


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Why won't it start?


It should automatically restart.....BUT what happened is that when you unplugged it, you cut off the blower at the same time you cut off the heat element(s). The way it is supposed to work, is the thermostat cuts power off to the elements and the fan continus to run for a per-determined amount of time to remove al the heat from the elements. Then another 'fan control switch' shuts off the fan once the 'residual' heat is removed from the heater. Without that 'cool down' cycle, the hot element had enough 'residual' heat in it to trip off the 'thermal overload' in the circuit. The 'thermal overload'... or...'hi limit'...or...'hi temperature control' is resposible for shutting power off to the element(s) in the event that the blower fails.

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89 cadillac eldorado, engine cooling fan and interior heater fans intermittently do not turn on when they should, they will reach 107Celius over heat light does not come on and coolant is circulating as it...


hi,
some vehicles have a synchronised twin electric fan system that operates only when the AC is turned on, can you manually turn off the AC and see if that changes what you have just described.
If not then the climate air ( AC ) sensor may be faulty.

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AC fan runs when heater is turned on in RV Dometic single zone


the heat and cool use the same fan. if compressor is running with heat then you have relay issue

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I have a 2001 intredpid 3.2 that is overheating. The passenger side cooling fan will not cut on. I just changed the fan motor yesterday and I still haven't seen the fan cut on. Since I changed the...


First off, there is a number of reason why u are hearing bubbling noises but first lets address your Fan. I take it that u have a 2 fan setup, when you say " The passenger side cooling fan will not cut in". This fan is associated with the AC, and only comes on when the AC runs. Helps with better air flow thru the condenser which is in front of the rad. Does the AC work?

OK, now for the bubbling noise. First off the noise indicates to me that maybe you still have problems with over heating. Does the fan on the drivers side come on? Where is the Temp gauge at when it does come on? You might have air in the system, which canbe bleed thru a bleeder screw on top of the motor. I found the best way to do this is have the frt of the car elevated abit with the car off when filling the coolant reservoir. Other things associated with over heating, thermostat not opening, or stuck open. Head gasket, possibly exhaust is getting into cooling system, building up pressure which vents when you shut engine off. Hench the sound. Water pump possibly leaking.

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1 Answer

Ac fan comes on every thing works fine but with the ac turned on it will over heat shut off the ac and it will cool off and run fine


u may have a cooling fan relay or cooling fan out,,,, the ac may be cutting out because it needs more freon it may not be over heating the low presure swtch is responsible for that

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The fan relay is not functioning correctly or the new sensor is defective.

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1 Answer

Low heat coming from heater


heater core may be clogged. disconnect the hoses. CUT THEM OFF THE HEATER CORE!!!! If you pull them you may damage the solder joints at the tubes causing a leak. Them connect a garden hose and flush one way then another till water runs clear.

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Cooling fan


i would deff check the relay i had a problem with my relay going out on my 04 but i just ran my fan to a togle switch so i can turn it on and off when i want it on when im in dead stop situations like traffic and also when your ac is on the fan has to be on or your ac will cut on and off to keep your car from really over heating in a hurry if your not moving, but i also run my car at the track and it helps to keep it cooler when racing down the drag strip.

Jul 14, 2008 | 2002 Chevrolet Cavalier Coupe

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