Blower motor with or w/o temp control?

Probably something going on with the blower motor control Processor . Hooking a scan tool an checking for DTC'S - diagnostic trouble codes would be the first step in a diagnostic procedure for a problem like this .

Auxiliary Blower Motor Control Processor
The auxiliary blower motor control processor is an interface between the auxiliary HVAC control module and the rear blower motor. The auxiliary blower motor control processor monitors supply voltage and ground circuits to the rear blower motor. The auxiliary HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The auxiliary blower motor control processor uses the blower motor ground as a low side control to adjust the blower motor speed.
The blower motor forces air to circulate within the vehicles interior. The vehicle operator determines the blower motors speed by placing the blower motor switch in a desired speed position or by selecting automatic operation. In manual operation, once a blower speed is selected, the blower speed remains constant, until a new speed is selected. In automatic operation, the HVAC control module will determine what blower speed is necessary in order to achieve or maintain a desired temperature.
As the requested blower speed increases, the following conditions occur:
• The HVAC control module increases the amount of time that the blower motor speed control circuit is modulated to ground.
• The voltage and duty cycle, measured between the blower motor speed control circuit and ground, decrease.
As the requested blower speed decreases, the following conditions occur:
• The HVAC control module decreases the amount of time that the blower motor speed control circuit is modulated to ground.
• The voltage and duty cycle, measured between the blower motor speed control circuit and ground, increase.

First. Check all the fuses-focus on the blower motor fuse. The fuse box is located near the hood release lever.
Make sure the slide levers controlling air direction and heat are at the top position. Make sure that the blower switch is on high.
Carefully pull temp control unit out about 2 inches, by removing 2 screws at bottom of unit. Get a test light, and check for current to the unit and blower motor.Make sure the connections to the switches are good.
Check the resistor connection to the blower motor. It is in the engine compartment on the AC condenser housing- at the firewall.
Check all the connections related to the blower motor and make sure there is current to the unit.
A test light will help determine what is at fault. If it is a switch behind the control unit, replace the whole unit. Your local auto salvage yard could have one.
Good luck.

Disconnect the negative battery cable.

Disconnect the blower motor lead connector from the wiring harness connector.

Remove the blower motor cooling tube from the blower motor.

Remove the four retaining screws.

Turn the motor and the wheel assembly slightly to the right so that the bottom edge of the mounting plate follows the contour of the wheel well splash panel.

Lift up on the blower and remove it from the blower housing.

Installation the new blower motor by reversing the removal steps.

Connect the negative battery cable.

The blowers fail but so do the blower controller ( ballast resistor) There is a fuse and a relay involved too and the compressior will still work. Blower motor failure is common and likly. with everything on and the cover off the lower dash on the passenger side beat on the motor it may start running again. If it does it could work a long time but ifit happens again you know you need a new motor

It is most likely a module,most of the time they are near the blower motor,maybe mounted to where it will go inside the blower box to keep cool,this controls the fan speeds only

Follow the blower wires. I believe you should find a relay. I suggest testing it as well. Make sure it is good. Also make sure fuse is good and secure. Test your control switches and check all the vacuum lines and wiring

Run's continuously ? High speed , low , med 1,2, 3 . ????
Probably the high speed relay contact's stuck closed . The fuse for the high blower is hot at all times , low blower fuse is hot only with key on. It sparks becaused the motor turns on . If it had a short the fuse would blow . The blower motor relay is part of the resistor pack near the blower motor .

blower relay is stuck in on position

R u sure u tested it correctly? There will be a 30 amp fuse usually associated with the blower motor however u need to look at the motor connections with a meter set to ac. These newer cars use a pwm type drive which is a pulsating dc voltage similiar to ac and should vary in amplitude as u turn ur control for speed. If u have that then ur motor is bad and has to be replaced.

for the first problem, it sound as if the blower motor resistor has gone out. this is a very simple repair and the part does not cost very much. If you can locate the blower motor, the resistor should be on the left side of the blower motor.
for your second problem, it sounds as if the remotes need to be reprogramed.

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