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Our 2004 Lincoln Navigator has dual climate control. The…

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Hello Our 2004...

Hello Our 2004 Lincoln Navigator has dual climate control. The front blower motor is not working. The rear works fine. We have replaced the 40a fuse an the Blower Motor Relay as well as the Blower Motor Resistor, We also Replaced the blower motor and still will not turn on.

Mechanic's Assistant: How many miles are on the car? Has the car been starting normally?

145k yes

Mechanic's Assistant: Are you fixing your Navigator yourself? What have you tried so far?

The front blower motor is not working. The rear works fine. We have replaced the 40a fuse an the Blower Motor Relay as well as the Blower Motor Resistor, We also Replaced the blower motor and still will not turn on.

Submitted: 6 months ago.Category: Lincoln
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Answered in 7 minutes by:
12/21/2017
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Lincoln
Satisfied Customers: 52,598
Experience: 16 years experience with Lincoln
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To prevent me and you from further guessing. Do you have a voltmeter or test light so we can do some tests?

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Customer reply replied 6 months ago
I have a test light.
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Super, remove the front blower relay. key off test all pins to ground. Is one powered? That is pin 30. Key on and HVAC commanded on, is there another pin powered? That is pin 86. You may need to use a paper clip to get into the pins if your test light is not skinny enough.

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Customer reply replied 6 months ago
Thank you, ***** ***** try that. I will not have access to the vehicle due to work until Saturday Morning. I will update you with my findings. Is there a second step after that to follow that i can report back on?
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Sure, here is the wire diagram https://www.dropbox.com/s/9o468hwp50mjy54/HVAC04nav.pdf?dl=0

We are doing tests to see if the relay is getting commanded, is it good and is the blower getting power. If the blower is getting power and no ground then we will diagnose the HVAC control and blower resistor and its ground. The next test if the first 2 pass will be to confirm good ground to relay pin 85 then install the relay and confirm power to the blower.

Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5-star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris

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Customer reply replied 6 months ago
Hello. I will be testing the relay tomorrow morning with the test light. I will report back with my findings
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Super

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Customer reply replied 6 months ago
Ignition off pin 30 is lit
Key on pin 85 and 30 is lit
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Key on, climate control on, relay out. Does the relay click when installed and removed and when installed is there power to the blower connector?

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Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Super, that means the ground is all we are missing.

Do you know how to test for ground using a test light?

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Customer reply replied 6 months ago
No. Can u help me test for ground with test ligbt
Customer reply replied 6 months ago
I put the test light on positive battery and ready to test for ground
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

To use your meter to test for ground you need to clip it on power and then probe anything ground like a ground wire or bare metal on the chassis. So you can use a paperclip in the blower connector power wire and clip onto that.

Here is the wire diagram in continuation to the prior one. https://www.dropbox.com/s/o13y0zcyglrdffo/EATC2.pdf?dl=0

The blower speed controller is right next to the blower. Confirm the black wire to it is a good ground.

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Customer reply replied 6 months ago
Is the blower speed controller the blower motor resistor ?
Customer reply replied 6 months ago
I have confirmed that the black wire for the blower resistor is giving me a good ground
Customer reply replied 6 months ago
The ground is good while keyed off if that matters any
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Manual climate control uses a resistor, automatic uses a speed controller.

We are up to test 4 in this file https://www.dropbox.com/s/zmwjezq4vlftnq3/testS1.pdf?dl=0

We are up to needing a volt ohm meter now to test the inputs from the EATC to the blower speed controller. Most likely and normally the controller is to blame with the current results.

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Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Blower speed controller.

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Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

That leaves doing the wire tests between the EATC and controller to see if there is a wire break and from the controller to the blower to see if there is a wire break. Signal is not getting from the EATC to the controller or no ground from the controller to the blower.

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Customer reply replied 6 months ago
OK I will have to go and purchase an ohm tester Due to the holidays I don't believe I will be able to pick back up on this until Tuesday
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

That is not a problem, all those tests I sent if followed will resolve this. The post does not time out till the 28th

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Customer reply replied 6 months ago
I will probably need further assistance with the ohm testing
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

Okay

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Customer reply replied 6 months ago
I am heading to pick up a multimeter. What would you like me to test first
Lincoln Mechanic: Chris (aka- Moose), Technician replied 6 months ago

We have completed steps S1-2-3 so you need to start at step S4

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Customer reply replied 6 months ago
9-10 off n on
Customer reply replied 6 months ago
We place the voltmeter on the resistor wire and slowly change the blower settings from one through six and we could see a visible change it appears the resister is working correctly
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