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It depends on the year, make and model but the first thing that you would need to check is if your vehicle has a cabin air filter because if so it can be clogged up and if not then check to make sure that the a/c - heater controls and the internal doors are working correctly........
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Why does your heater blower only run on high?
The blower motor speed resistor is burned out.
Why does your blower motor only run on high?
the heater resistor needs to be replaced it is mounted in the heater box next to the blower motor
Why does heater blower on 1992 s10 run on high only?
Probably the blower motor resistor is shot.
How does heater work on thermo king apu?
Same way the heater on your truck works... coolant is run through the engine system, becomes heated, is run through a heater coil, and a blower blows the heated air around the heater coil through the ductwork to heat up the vehicle.
How do you determine if the heater blower switch or heater blower motor is bad on a ford 2002 crown Victoria?
You can unplug the blower motor and run a jumper wire to test the blower motor. If it is grounded through the plug you'll have to run a ground wire to it also. Blower Motor tested good. The Problem was the Blower Motor Controller which was located on the firewall just below the Heater Hoses. Thanks for responses to question.
Where is heater fuse 1989 acclaim?
There is no heater fuse, the heater works by having hot coolant run threw a heater core that's inside the dash, then when you turn the heat on, the blower motor blows threw the heater core, sending the hot air inside the vehicle.
Why does your heater and air keep blowing fuses cannot run it without blowing fuses?
There is an electrical short to ground in the fan switch or in the blower motor itself.
What has failed when the Heater blower won't run on high speed on a 2002 GMC Sierra?
BLOWER MOTOR RESITAR SWITCH
Why wont the heater motor shut off 2002f150?
Generally automotive blower motors are designed to run on the lowest speed even though the heater is turned off. The purpose is to circulate fresh air into the cab.
Why does the air condition and heater blower motor run when air condition and heater and ignition are turned off?
Depending on the way the vehicle is wired, it could be a bad ignition switch or a stuck relay. You'll need to look at a wiring diagram to find out how power is supplied to the blower and AC system. Then go backwards to find out what's on that SHOULDN't be.
What could cause the heater air conditioner blower motor on a 1995 Olds Aurora to run all the time - even when the ignition switch is off?
faulty switch
Why will the heater fan run sometimes and not run other times?
Most likely is a short in the wiring from your heating/cooling/vent controls to the blower motor, or simply the blower is going bad.
