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A common problem is this situation is the thermostat itself, though it also depends on the make and model. A proper 'diagnosis' would be found by a professional, especially if it's been awhile since the unit has been serviced.

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Q: What might cause a furnace blower to not work when set on auto?
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Is it advisable to have the furnace blower fan set to the on position at all times?

No it is not advisable. Put it on AUTO. The furnace will decide when it is practical to turn the fan on. Really. No it is not advisable. Put it on AUTO. The furnace will decide when it is practical to turn the fan on. Really.


What is the problem with my 2001 Chrysler town and country that the front blower stays on and in automatic mode all the time?

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The blower motor speed resistor is burned out. The resistor is located close to the blower motor and is easy to change. Your local auto parts store will have that part for you.


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number of things can cause turn tstat from auto to on to rule out power to unit, transfomer and motor if it dosent u have voltage problem or bad capacitor or fan motor You may want to try askarepairtech.com. They can diagnose the problem by phone and if you are handy, you can replace the part yourself. If not, they can do it.


What would cause my blower motor to only run at high speed on my 1998 Chevy Express?

The blower motor speed resistor is burned out. The resistor is usually found close to the blower motor. Auto parts stores carry that part and it is easy to replace.


Does the engine need to be replaced if a blower stops working on a 1991 Honda Accord?

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Why might a 1999 Bonneville SSI heater fan blow sometimes and not other times?

I have the same issue - I have found that if I wiggle the wires at the blower motor - the blower kicks in. I haven't gotten to it yet but I suspect that the plug connector is dirty inside or doesn't have enough pressure to make good contact. I plan on cleaning the connector and maybe bending the contact to create more pressure. As might be suspected, it only fails when it is very cold outside and you really need the blower. i had the same problem, replaced the blower motor, $45, advanced auto parts, works good now! I was having the same problem. My husband found a loose connection under the hood on the blower fan. I also had the same problem. I fount that the cause was a defective wire to the blower control module


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