I have a 1997 740IL and for the past year, the blower motor will ONLY work when it chooses to. I have been through two blower motors and three fan-speed control panels and they all did the same thing. I couldn't drive the car all Winter due to no heat and just yeasterday, the blower worked when I turned the car on; however, after shuting the car down, I was back to the same delimma. HELP PLEASE!
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had this problem which took a couple different directions. First was very simple...the control knob was turning on the shaft,, it had rounded off. Put some glue on it and worked for a year until problem like you described arose again. Replaced all components like you did but had intermittent blowing. Replaced blower again which solved problem...for now anyway...defective NEW blower.
The temperature display and the heater function are likely two different issues. I had a similar issue with intermittent heat on my 2001 Aurora. In my case it turned out to be the blower motor. As a vehicle ages and the bearings on the motor start going bad, the amount of energy it takes to spin the motor gets higher and higher. This can result in intermittent behavior or cause the heater resistors to go bad. It is also possible that the heater control itself is the issue, but with the age of this vehicle, I would start with the blower motor and then heater resistors.
Hi, an intermittent blower can be caused by either the switch or the motor itself. To find which it is, try messing with the switch to see if it will misbehave. If not, then the next time it doesn't work, try hitting the motor. Unfortunately your blower is behind the glove box, but maybe you can just pull the glove box past its stops and reach back to hit the motor with your fist. It hitting it makes it start, the motor has a dead spot on the commutator and should be replaced. Please let me know if you have any questions, and thanks for using FixYa.
It is most likely not the blower motor. Intermittentoperation usually means the blower relay is failing. It should be under the hood in the main fuse box. Try that before you spend a ton of money on bigger parts. Hope this helps. Good luck.
How about checking voltage into & out of resistor for difference. Some swear by high only when resistor goes, but in past I have had intermittent use of other speeds before it finally went & I had high only.
Try a SHOCK test to the blower motor case. What I mean is SHOCK the case by hitting it with the palm of your hand (make sure you have the blower switch 'HIGH' and the IGN key also 'ON'.. if the blower starts working, you have an intermittent contact in the motor itself. If this doesn't work, get a test light and connect it to the connector that plugs into to the blower motor - if the test light illuminates, then the problem is obviously in the motor. If it doesn't, then you have a wiring/switch/power supply problem.
check the fuses and blower motor resister first. Some systems don't have resisters. Use blower motor speed control instead.
SECTION 412-04: Control Components
2001 Crown Victoria/Grand Marquis Workshop Manual
REMOVAL AND INSTALLATION
Blower Motor Speed Control
Removal and Installation
Disconnect the wire harness connector.
Remove the screws and remove the blower motor speed control.
To install, reverse the removal procedure.
The blower motor is inoperative—EATC
Circuitry open or shorted.
A/C blower motor switch.
A/C blower motor resistor.
A/C blower motor.
Go To Pinpoint Test
---------------------------------------------------------------------------------------------- Electronic Automatic Temperature Control Module Self-Test
The EATC module self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A diagnostic tool must be used to retrieve these concerns.
The EATC module self-test will detect concerns in the system control functions and will display hard diagnostic trouble codes (DTCs) in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4° and 32°C (40° and 90°F) when carrying out the self-test. If the temperatures are not within the specified ranges, false in-car temperature sensor DTCs will be displayed.
The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated.
To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.
If any DTCs appear during the self-test, follow the diagnostics procedure given under ACTION for each DTC given.
If a condition exists but no DTCs appear during the self-test, refer to the Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Improper Operation.
To exit self-test and retain all intermittent DTCs, push the blue (cooler) button. The control will exit self-test, retain all intermittent diagnostic trouble codes and then turn OFF (display blank).
To exit the self-test and clear all DTCs, press the DEFROST button. The vacuum fluorescent display window will show 888 and all function symbols for one second. Then, the EATC control assembly will turn OFF (display blank) and all DTCs will be cleared.
Always exit the self-test before powering the system down (system turned OFF).
Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs.