Could be a problem with the vacuum system (leak at hose or motor either under hood or dash) if air is being directed to defroster (this is default position) Could be a plugged evaporator if no air at all
Does blower motor run?
try the head gasket.
Check the fuse as per the owners manual and if the fuse is o.k, then the blower may be faulty. check the blower then. if both of these are good, the problem is expensive.
There is no heater blower is a Honda. The heat created on the air condition system is heated up through a heater core. If there is no heat coming out then the heater core will be the culprit.
If the noise is a squeaking sound, it could be coming from the bearings in the blower fan. It could also be coming from a worn bushing or bearing in the blower motor.
I have experienced the same problem a couple of times recently. I have no idea what this might have been, but it definitely sounded like a leaf blower and it happened twice when engine was at normal operating temperature. At first, I thought the noise was coming from outside (somebody using the blower), then, when I realized it is coming from under the hood I stopped and checked. However, I could not pinpoint the problem. Did you get this resolved and /or look at? Please share your experience.
2 problems: Either the fan broke loose from the blower motor shaft or there is debris (usually leaves or pine needles) blocking the air entry way.
If the heater fan works on all speeds, then the blower motor, blower fuse, blower relay, and blower motor resistor pack are all good. If the fan runs but nothing comes out of the vents, you have a 'mode door' issue (which might include a bad control head).
Clogged fuel filter or the pump is defective even though it is running. It may be running but not pumping any fuel.
look in your service manual for blower motor resisters. they are typicaly what goes bad and stops the blower motor from running. i dont know where they are in your vehicle
He sees the snow blower coming.
Defrost uses the a/c, if it doesn't smell the same with a/c only on. The smell is coming from the blower motor. Bmw's for example have a problem where the blower blade contacts the plastic housing and causes it to rub/melt.