Most higher end luxury vehicles are designed not to blow cold air and fan starts after engine coolant temperature is warm
The blower motors only work with the engine running. If the blower motor has three wires on the electrical plug, then the blower motor module is built into the unit & it's very expensive. Sometimes, you can tap on the motor with a hammer & it may work or slowly turn. If this is the case, replace the blower motor.
If the blower works on the defrost mode only, you could have a disconnected vacuum supply line coming from the engine. If the blower motor doesn't work on any mode or speed you could have a blown fuse, burned out blower motor speed resistor, bad switch or a bad blower motor.
Replace blower motor resistor usually located in the duct work or out in engine compartment in ductwork by heater motor.
Your blower switch sensor is out. Replace it!Then all the speeds will work
either the blower control switch or the blower motoer needs replacing
You most likely will have a bad blower resister........
truck blower only work on high
Check your blower motor relay!
the blower resistor controls the fan speeds
from what i have read it is the blower motor resistor it goes bad and only lets the fan run on high google blower motor resistor and read on
A blower motor that only works on high is normally caused by a defective Blower Motor Resistor Pack. DRL, do not have a clue.
blower motor resistor needs to be replaced