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HDGene
HDGene, ASE Certified Technician
Category: Lincoln
Satisfied Customers: 5643
Experience:  25 year ASE Master Technician & Advanced Drivability L1 Certified Ford Senior Master Technician
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Lincoln Town Car: , I have a 2000 Lincoln Town car and

Customer Question

Hello, I have a 2000 Lincoln Town car and the blower motor was not working but when I tapped the motor it started working. A quick note, the control head was on when I tapped the motor but when I hit the off button on the control head the blower still runs on high. All of the modes (floor,def,vent etc.) all seem to work using the control head but the a/c isn't working.
Any suggestions?
Submitted: 2 years ago.
Category: Lincoln
Expert:  HDGene replied 2 years ago.
Most likely there is a short in the blower motor since you got it to kick on once you hit it. Unplug the blower motor and check for power and ground at its connector with the control panel off. There should be none. If there is still power at the motor, then you have a seperate issue possibly with the control head
Customer: replied 2 years ago.
OK I will try that, also would the control head keep the a/c from operating?
Expert:  HDGene replied 2 years ago.
Yes that is a possibility and they do go bad
Customer: replied 2 years ago.
Also...How does the blower motor speed controller figure into the situation? I'm hearing about these going bad as well
Expert:  HDGene replied 2 years ago.
It is basically a fancy blower resistor but different,its a solid state electronic control instead of just a resistor, it regulate fan speed.Typically one will fail and it will only blow on high speed or a certain fan speed only not low, medium or high
Customer: replied 2 years ago.
So there is 12v going to the blower motor connector with the control head off so I assume the head is bad?
Expert:  HDGene replied 2 years ago.
Gimme a few minutes to double check the circuit.
Expert:  HDGene replied 2 years ago.
Sounds like it could be either a shorted blower speed controller or eact control head. Here is a pinpoint test to check the circuit: N1 CHECK CIRCUIT 515 (OG/RD) FOR A SHORT TO GROUND Blower Motor Speed Control C169 Press the PANEL button on the EATC module. Adjust the blower motor setting to LO and then to HI. Does the blower motor operate correctly?YesREPAIR circuit 515 (OG/RD) for a short to ground. TEST the system for normal operation.NoGO to N2.N2 CHECK THE BLOWER MOTOR SPEED CONTROL Blower Motor Speed Control C169 EATC Module C227 Does the blower motor operate?YesINSTALL a new blower motor speed control. TEST the system for normal operation.NoGO to N3.N3 CHECK THE BLOWER MOTOR SPEED CONTROL CIRCUITS FOR AN OPEN Blower Motor Speed Control C169 Measure the resistance between the blower motor speed control C169:pin 1, circuit 269 (LB/OG) and the EATC module C227 pin 10.pin 2, circuit 752 (YE/RD) and the EATC module C227 pin 23.pin 3, circuit 754 (LG/WH) and the EATC module C227 pin 24. Are the resistances less than 5 ohms?YesGO to N4.NoREPAIR the affected circuit. TEST the system for normal operation.N4 CHECK THE BLOWER MOTOR SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE Measure the voltage between the blower motor speed control C169:pin 1, circuit 269 (LB/OG) and ground.pin 2, circuit 752 (YE/RD) and ground.pin 3, circuit 754 (LG/WH) and ground. Is voltage present?YesREPAIR the affected circuit. TEST the system for normal operation.NoGO to N5.N5 CHECK THE BLOWER MOTOR SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the blower motor speed control C169:pin 1, circuit 269 (LB/OG) and ground.pin 2, circuit 752 (YE/RD) and ground.pin 3, circuit 754 (LG/WH) and ground. Are the resistances greater than 10,000 ohms?YesGO to N6.NoREPAIR the affected circuit. TEST the system for normal operation.N6 CHECK THE BLOWER MOTOR SPEED CONTROL CIRCUITS FOR SHORTS Measure the resistance between the blower motor speed control C169:pin 2, circuit 752 (YE/RD) and C169 pin 3, circuit 754 (LG/WH).pin 2, circuit 752 (YE/RD) and C169 pin 1, circuit 269 (LB/OG).pin 3, circuit 754 (LG/WH) and C169 pin 1, circuit 269 (LB/OG). Are the resistances greater than 10,000 ohms?YesGO to N7.NoREPAIR the affected circuits. TEST the system for normal operation.N7 CHECK THE EATC MODULE HIGH BLOWER OUTPUT EATC C281 Blower Motor Speed Control C169 Adjust the blower motor speed to HI. Measure the voltage between the EATC module C227 pin 24, circuit 754 (LG/WH) and ground by back-probing the EATC module C227. Is the voltage within 2 volts of battery voltage?YesGO to N8.NoINSTALL a new EATC module. TEST the system for normal operation.N8 CHECK THE EATC MODULE BLOWER CONTROL OUTPUTAdjust the blower motor speed to LO. Measure the voltage between the EATC module C227 pin 23, circuit 752 (YE/RD) and ground by back-probing the EATC module C227. Is the voltage greater than 1 volt?YesINSTALL a new blower motor speed control. TEST the system for normal operation.NoINSTALL a new EATC module. TEST the system for normal operation This below is a straight up if it only worked on certain speeds test FORD:1990-1993 THUNDERBIRD1990-2001 CROWN VICTORIA1995-2001 EXPLORERLINCOLN:1990-2001 TOWN CAR2000-2001 LSMERCURY:1990-1993 COUGAR1990-2001 GRAND MARQUIS1997-2001 MOUNTAINEER ISSUE:The following service procedure has been developed to aid technicians in diagnosing EATC/DATC system blower motor control concerns.ACTION:Refer to the following Service Procedure as an aid in helping diagnose blower motor control concerns.SERVICE PROCEDURE Check blower motor operation in all speeds.If the blower motor does not operate in any speed, refer to Step 2.If the blower motor continuously operates in HIGH, refer to the appropriate pinpoint test in the Service/Workshop Manual.If the blower motor does not operate in HIGH speed, refer to Step 3.If the blower motor does not operate at speeds other than HIGH, refer to Step 4. NOTE:REFER TO FIGURE 1 FOR CONNECTOR VIEW. Refer to the appropriate pinpoint test in the Service/Workshop Manual, except for checking the EATC/DATC module. When checking the EATC/DATC module, set the blower motor speed to HIGH blower and measure the voltage between the blower motor high blower relay circuit (Pin 3 at the controller) and ground at the EATC/DATC module connector.If the voltage is within 2 volts of battery voltage, measure the resistance between the blower motor speed controller connector Pin 3 and the corresponding circuit/pin at the EATC/DATC module connector. If the resistance is 5 ohms or less, install a new blower motor speed controller (19E624). If the resistance is greater than 5 ohms, repair the circuit. Retest the system for proper operation.If the voltage is more than 2 volts below battery voltage, measure the resistance between the blower motor speed controller connector Pin 3 and ground. If the resistance is 5 ohms or less, repair the circuit. If the resistance is greater than 5 ohms, install a new EATC/DATC module (19980). Retest the system for normal operation.Set the blower speed control to HIGH and measure the voltage between the blower motor control high blower relay circuit (Pin 3 at the controller) and ground at the EATC/DATC module connector.If the voltage is within 2 volts of battery voltage, measure the resistance between the blower motor speed controller connector Pin 3 and the corresponding circuit/pin at the EATC/DATC module connector. If the resistance is 5 ohms or less, install a new blower motor speed controller (19E624). If the resistance is greater than 5 ohms, repair the circuit. Retest the system for proper operation.If the voltage is more than 2 volts below battery voltage, measure the resistance between the blower motor speed controller connector Pin 3 and ground. If the resistance is greater than 5 ohms, install a new EATC/DATC module (19980). If the resistance is 5 ohms or less, repair the circuit. Retest the system for normal operation.Set the blower speed control to any speed other than HIGH and measure the voltage between the blower motor control blower control circuit (Pin 2 at the controller) and ground at the EATC/DATC module.If the voltage is below 1 volt, measure the resistance between the blower motor speed controller connector Pin 1 and ground. If the resistance is greater than 5 ohms, install a new EATC/DATC module (19980). If the resistance is 5 ohms or less, repair the circuit. Retest the system for normal operation.If the voltage is between 1 and 3 volts, measure the resistance of the circuit between the blower motor speed controller connector Pin 2 and the corresponding pin at the EATC/DATC module connector. If the resistance is 5 ohms or less, install a new blower motor speed controller (19E624). If the resistance is greater than 5 ohms, repair the circuit. Retest the system for normal operation.If the voltage is greater than 3 volts, measure the resistance of the circuit between the blower motor speed controller connector Pin 1 and the corresponding pin at the EATC/DATC module connector. If the resistance is 5 ohms or less, install a new blower motor speed controller (19E624). If the resistance is greater than 5 ohms, repair the circuit. Retest the system for normal operation.
Customer: replied 2 years ago.
Are there diagrams that show where I can find these connectors?
Expert:  HDGene replied 2 years ago.
This is the blower speed controller under the hood in a real bad spot in the evaporator box near the rear of the engine
Expert:  HDGene replied 2 years ago.
The eatc contoller is on the back of the climate control head.
Customer: replied 2 years ago.
OK so I replaced the EATC and now the fan kicks on as if the a/c were on. The compressor still doesn't engage however the clutch spins freely...any suggestions?