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If the blower works on high speed, but not on any of the lower speeds, that usually means that the blower motor speed controller is bad. There is a resistor in there which can overheat and burn out. If the blower motor has a bad bearing (makes noise or doesn't turn as fast as it should) that would cause the system to draw more current than normal, and burn out the resistor. If that is the case, you can replace the speed controller, and that would probably fix the problem, but likely it would return in a relativly short time. Without vehicle info, a step by step instruction would be rough... But that is a place to start in you search. Hope this helps.
What else can I help you with?
1999 caviler and the fan blower motor only has 2 speeds low speed does not work how do you determine the problem?
change the blower motor resistor . this controls the speeds . thanks paul
1988 Toyota truck blower motor speeds won't work on low speeds?
The blower motor speed resister is burned out.
1999 Suburban the fan blows on low speeds but not on high?
Could be hi-speed fan relay or secondary winding in blower motor
Cause for low speeds on blower fan 1994 ford not to come on high speed works?
Resistor on the heater blower motor has failed
Why does the front blower only work on high setting but not low or medium on 2002 Chrysler Town and Country?
When the fan is on high it does not run through the blower motor resistor. The low speeds don't work because the blower motor resistor is bad.
Why would our 97 lesabre blower work sometimes and sometimes not?
If the blower motor randomly and intermittenly quits and does not work, chances are good the blower motor itself is faulty, if the blower motor does not work on all fan speeds from low through high, it most likely needs a blower motor resistor.
How do you find fault on heater fan not workin mk3 mondeo?
If all speeds do not work, suspect the fuse, the switch, the switch connector or the blower motor. If only high speed works, suspect the blower motor speed resistor. If low speeds work and not high, suspect the blower motor relay.
1993 Chevy pu you have no low or med blower motor speeds you have high only you have checked all the fan speed relays resistor fan switch and blower motor all ok What to do next?
Resistor pack on blower motor? Fan switch? Low speed relay?
Can a 1994 Chevrolet Caprice Classic heater blower motor resistor be tested to see if it needs replacing?
If you have only high speed on the blower motor or you are missing one or more low speeds, chances are the blower motor speed resistor is burned out.
Were is the low speeds heater relays for 1996 gmc?
You have a relay located behind the glove box once removed to the left and you also have a blower resister that controls the speeds located on the passengers side in the blower motor housing..............
Why does the Blower motor only work on low speeds?
On most cars there is a high speed relay that can go bad and would need replaced .
What would cause the blower motor resistor to keep shorting out on your 93 astro van don't have your low and medium speeds only have the last two replaced the switch and it test good still?
u need a new blower motor
