Question about 1999 Ford Super Duty F 550

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With ingition on the OFF position, the fan blower motor inside the cab stays running, the signal lights still operatable.

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The igntion switch is either out of adjustment or [ most likey ] bad and needs to be replaced.

Posted on Mar 17, 2011

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1 Answer

Missing variable control voltage on the blower fan control module on a 2008 Buick lucerne


What are you using to test this control signal ? Were you on right wire ?
Blower Motor Control Processor The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

Chevy Trailblazer EXT Blower Motor Won Turn Off The blower motor in this video don't shut off , but he show's how to test the PWM signal right !
Your blower motor control module is probably bad , or HVAC control panel is bad , or a wiring problem !

Sep 26, 2016 | 2008 Buick Lucerne CXL

1 Answer

Fan just stopped working inside cab for heat and ac


That's a heater/A/C blower motor ! What make , model an year vehicle ? Doesn't it work in any speed position ? Fuse , relay , control head , resistor or the motor itself could be the problem .There are videos on you tube on testing blower motor circuit .

May 31, 2016 | Cars & Trucks

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Heater fan isn't working in my 1997 ford f150 extended cab 4x4


What have you checked so far ?
Fuse - resistor - power at the blower motor ?

Feb 13, 2013 | 1997 Ford F150 Regular Cab

1 Answer

I turned on the ac and the light does not work, the vents are not blowing and the car is running hot. I have a saturn SL 1996


First check the 15 amp HVAC fuse located in the main fuse block inside the car on the passenger side of the center console, under a cover. If the fuse is good, then the problem may either be the HVAC blower switch (which is the fan blower selector switch), the fan blower motor resistor, or the fan blower motor. An auto repair manual will explain and illustrate for you the steps on how to check each of these components.

Even after pushing the ac light switch on, the fan blower selector switch has to be turned on as well (working) because it provides an electrical path to the positive side of the battery to complete the circuit and turn the ac light on. What the ac light switch does is provide the electrical path for the ac compressor clutch to come on through the ac control relay which is controlled by the car's PCM(computer) when you want ac, but the ac light switch still needs to run through the fan blower selector switch to receive its power. You can turn on the fan without the ac light switch because it gets its ground path(negative) from the blower motor. So the blower motor has to work in order to provide a ground path for the fan blower selector switch to be functional. You could have a faulty blower motor which is why no air blows through the vents. The fan blower motor is located inside the car on the passenger side underneath the dash at the bottom end of the glove compartment box. You'll see it. It's right above where a person rests their feet on the floor. Therefore, if your 15 amp HVAC fuse is good, check to see if you have voltage at the blower motor connector. Unclip the connector and with the ignition on and the fan blower switch moved to any one of the first 3 selections, check for voltage using a multimeter. The voltage will vary because there is a blower motor resistor. Voltage should be higher on setting 3 than 1. If you do have voltage at the blower motor connector, check for a faulty blower motor. The auto repair manual will tell you how to do it using jumper wires.

It's normal that your car is running hot because the radiator fan works in conjunction with your ac compressor. If the ac is on, the radiator fan will be on and therefore the engine coolant temperature will stay in it's normal operating range. If the ac is off, the radiator fan will stay off as well and the engine coolant temperature gauge will begin to rise and show pretty hot (especially at idle). It will do this up until a certain degree then the radiator fan should turn on thermostatically and stabilize the temperature. It's scary and I know what your saying because it does that to my car if my ac isn't on. Don't worry it won't overheat.

May 29, 2011 | 1996 Saturn SL

1 Answer

My 1988 Ford Tempo's heater fan is not working. I can feel heat at the windshield vents,but the fan wont come on. I have jumped the fan speed switch with a paper clip--and blew a fuse--and checked the...


your circuit is simple--I will paste it below. suspect the blower has shorted and caused the switch to burn up. remove the blower and hotwire it to the battery to see if it works. If not, replace the blower. Then run continuity tests on the swoitch and replace switch if bad. If you have questions, please let me know. Here is procedure for taking blower out:


REMOVAL & INSTALLATION With Air Conditioning

  1. Disconnect the negative battery cable.
  2. Remove the glove compartment door and glove compartment by removing the retaining screws and bolts. Push the sides of the glove box in to free the drawer from dash panel.
  3. Loosen the instrument panel at the lower right hand of the glove compartment opening. This is on it necessary if the panel is in the way of the motor housing.
  4. Remove the retaining screws securing the ducting around the blower motor.
  5. Remove the clip securing the blower motor fan blade to the motor arm. Remove the fan blade from the motor.
  6. Remove the blower motor mounting plate from the evaporator case by unscrewing the retaining screws.
  7. Rotate the motor until the mounting plate clears the edge of the glove compartment opening and remove the motor.
  8. Remove the wire harness from the rear of the motor.
  9. Inspect the fan blade for broken edges or cracks. Replace if needed.

To install:
  1. Connect the wire harness to the rear of the blower motor.
  2. Install the motor into the case and secure with the retaining screws.
  3. Position and fasten the fan blade to the blower motor arm. Secure with the clip.
  4. Secure the blower motor outer housing to the duct assembly with the retaining screws.
  5. Install the instrument panel at the lower right hand side if removed earlier.
  6. Install the glove compartment door and glove compartment.
  7. Connect the negative battery cable.
  8. Run blower motors to make the motor works correctly.
Without Air Conditioning
  1. Disconnect the negative battery cable.
  2. Remove the right ventilator assembly.
  3. Remove the hub clamp spring from the blower wheel hub. Pull the blower wheel from the blower motor shaft.
  4. Remove the blower motor flange attaching screws located inside the blower housing.
  5. Pull the blower motor out from the blower housing (heater case) and disconnect the blower motor wires from the motor.

To install:
  1. Connect the wires to the blower motor and position the motor in the blower housing.
  2. Install the blower motor attaching screws.
  3. Position the blower wheel on the motor shaft and install the hub clamp spring.
  4. Install the air inlet duct assembly and the right ventilator assembly.
  5. Connect negative battery cab
  6. Check the system for proper operation.

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Oct 21, 2010 | 1988 Ford Tempo

1 Answer

My car's inside fan stays on even when off mode


the blower motor resistor is probably the problem with the blower staying it,

Jan 24, 2010 | 2004 Pontiac Grand Prix

2 Answers

The AC button light blinks on and off. AC won't


When the light is blinking that means there is a code in the system you will have to take it to a shop and have the codes read. Sometimes "Jiffy Lube" or "Rapid Oil Change" can read the code for but they won't fix it. If the blower motor only runs on high, the blower motor resistor is bad. When you put the fan switch on high it puts full voltage to the fan motor (blower motor) when the fan switch is in any other position, the voltage is reduced by the resistor causing the motor to run at slower speeds. The two problems are probably a result of the resistor.

Dec 14, 2009 | 2003 Chevrolet Malibu

1 Answer

My blower for the fan in my 2004 chevy 1500 crew cab stoped working, there is no air coming in through the vents. how easy is it to fix


Looks like those trucks had two different fan vendors. Here are the instructions for both:

Removal & Installation Delphi To Remove:
  1. Remove the instrument panel sound insulator panel (if equipped).
  2. Disconnect the electrical connector from the blower motor.
  3. Remove the blower motor insulating cover screws.
  4. Remove the blower motor insulating cover.
  5. Pull the retaining tab down and rotate blower motor counterclockwise to remove.
To Install:
  1. Position the blower motor and turn assembly clockwise until tab locks in place.
  2. Install the blower motor insulating cover.
  3. Connect the electrical connector to the blower motor.
  4. Install the instrument panel sound insulator panel (if equipped).
Visteon

To Remove:
  1. Remove the instrument panel sound insulator panel (if equipped).
  2. Disconnect the electrical connector from the blower motor.
  3. Remove the blower motor screws.
  4. Remove the blower motor from the HVAC module.
To Install:
  1. Position the blower motor and install mounting screws.
  2. Connect the electrical connector to the blower motor.
  3. Install the instrument panel sound insulator panel (if equipped).

Jun 22, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

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