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Hi Dean, I don't really know what you mean by the register, but I believe your problem is to do with the resistor which is built into the fan housing. It consists of three wire wound resistors and is fitted into the fan housing to take the benefit of the fan to cool the resistor pack. The climate fan at full speed runs directly from the battery voltage. The lower speeds run through the relevant resistors (which are of different values) and thereby run the fan at decreasing speeds. Remove the covers from the both sides of the fan housing and on one side you will see a small panel held in position be one or two screws. The panel will have cables plugged into it, which are those for the fan. To confirm you have the correct panel, turn on the ignition and the fan at full speed and disconnect the plug from the socket. the fan will stop and bingo! you have it! Remove the unit and either repair the unit or better still go to a breakers yard and buy a replacement from there before they wreck it! Fit it in, connect the plug, put back the paneling and enjoy. Regards John
Check that the fan is starting and working OK. When you drive the air hitting the front of the radiator may compensate a malfunctioning fan. When you stop without the fan working the radiator gets hotter and your dash tells you that there is overheating.
If the fan is working replace the thermostat that may be starting the fan too late. Also check fan fuse and relay.
Do not drive the car in this conditions. Overheating can easily cause damage to the head gasket. An head gasket problem will require a more expensive repair.
Usually the first thing to inspect when the blower fan stops working is the fuses to see if any are blown. Locate the 10A cluster fuse or the 25A HVAC fuse in your car manual, and examine them to determine if they need replacing. The car owner's manual will tell you where to find the fuses that are connected to the heat and/or air conditioning. On the interior fuse panel of the car, a 30 amp fuse is labeled "Heater" or "HVAC."
Bad Blower MotorIf the fan only works on setting number 3 or 4, or just on the highest setting, it is most likely that your blower motor is failing and is about to die. Use a voltmeter to test the amount of voltage at the blower motor connector with your ignition on and AC running. If it reads 12V, the motor needs replacing.Automatic Climate Control SystemAnother thing that causes the blower fan to malfunction is the Automatic Climate Control System (ACCS). If the ACCS's settings are off, it may cause the fan to stop working. If it is the climate control on the car, typically it is a bad thermostat or electrical circuit that is the culprit. hope this helps, James Booth
Many cars have this feature. The fan will run for a few minutes at a time until the coolant in the radiator drops below a certain temperature. Most vehicles with this feature will have a warning label on the radiator shroud indicating that the fan may start without warning when the engine or radiator is still hot. The only time you would need to be concerned would be if the fan continues to run without turning itself off, and causing the battery to be drained.
If the fan is running when connecting 12V power direct to the fan the problem is located to the "Fan resistor" The Fan Resistor can be found behind the glove compartment. Repair not possible - the component must be replaced.
My suggestion is replacing your wiring going to the resistor which is acdelco part number PT1231. I have had the problem of speeds 1,2, and 3 intermittently working while 4 always worked. Afterreplacing this part, all of my fan speeds work all of the time.