Had same probllem on High. 2002 "The fan blows cannot control temperature via temperature knob on the dash?" Knob was useless. Turns out that the problem was the A/C/Heating control unit. Replaced under warranty $1000
The blower resistor has failed. The resistor is located behind the glove box.
I have an 89 Delta 88 and if you have Electronic Climate Control there is a control module located just right(passenger side) of center at the firewall. It is in the same location as the blower fan resister assembly on a car with standard a/c controls.
Check your fuses(there to protect the wires), also there maybe a relay switching power to the front blower that has failed. Relays allow low current switches or controls to activate high current circuits(blower motor). Other possible causes blower failed, connector bad, or wiring.
No. An AC/heater control module is a computer that controls and automates the operation of the heating, ventilation, and air conditioning systems (HVAC).The blower resistor enables the blower motor to change the speed of the fan.
The fusebox which controls the blower motor is under the hood up by the firewall.
The blower is controlled by the blower switch, blower resistor, and relevant power relay.
There are two screws holding it in. It is located underneath the glove box. Now Depending on if you have manual controls or auto controls will determine what you have to do. For auto controls the blower motor resistor gets plugged in with 3 wires (i believe its red black and orange) and then has two wires coming out of it that plug directly into the blower motor(red and black). For manual controls it is just plugged in and mounted. The purpose of the resistor is to eat up the juice of the battery to control the speed of the blower motor.
Could be a number of reasons, including normal operation - if your car has Automatic Temperature Control or Semi-Automatic Temperature Control. Or it could be a problem with the blower itself or the circuit which runs the blower. Working on an AC system is generally not a do-it-yourself task, and there are several reasons why. I'd recommend you have a shop take a look at it.
If it has separate blower speed controls for the front and rear, it has separate resistors. Blower speed resistors are mounted close to the blower motor it controls for cooling purposes.
Chack the speed control switch and the resistor that controls the speed of the motor
Common causes, blower motor resistor, blower motor, wiring or controls
When that happens on a Chrysler Town and Country with auto temperature, the blower motor power module has failed. It is also called a blower motor resistor.