2003 Rear A/C not blowing, Blower, Fuse & Resistor is Good. HELP!

[DeeeePIMPact]

Hello,

First off let me say, I've been referencing your site ever since I purchased my truck. This is my first post though.

I am having a problem among other with my Rear A/C not blowing air in the back... About 2-3 weeks ago my belt shredded and my mechanic told me it was because of my A/C condenser locking up. I thought this was strange because the A/C condenser had never given me any problems, nor ever made any noise, much less always blew cold air...

Nonetheless I replaced the condenser in hopes of this problem not happening again... Fast forward till now, and now my rear a/c is not blowing at ALL... I've never had a problem with my rear a/c working and has always blown and always blew cold...

I have taken the blower out and bench tested it. It works fine. I used a jumper to bypass, the blower resistor and is still a no go... I have also check the fuse at the #107 location and it is good.

I do know the front a/c needs to be on and all fan speeds are at 4 at the time of testing.

The only other information I can provide, is that I do seem to be missing both actuators, which my mechanic has told me, would have no effect on the blowing of the a/c.

Does anyone have any other suggestions? Thank you for any and all help!

Richard.

 

[Bedrck47]

Welcome to the Forum

 

[Bedrck47]

Need some more information.

Is your front A/C controls EATC or MANUAL control?

How did you check fuse 107?

Did you check any other fuses and if so which fuses and how did you check them?

• The auxiliary blower motor is inoperative

• Fuse.
• Circuitry short/open.
• Auxiliary blower motor relay.
• Auxiliary blower motor.

• Go To Pinpoint Test S .

• The auxiliary blower motor does not operate correctly using the front auxiliary climate controls

• Fuse.
• Circuitry short/open.
• Auxiliary blower motor switch.
• Auxiliary blower motor resistor.

• Go To Pinpoint Test T .

• The auxiliary blower motor does not operate correctly using the rear auxiliary climate controls

• Fuse.
• Circuitry short/open.
• Auxiliary blower motor switch.
• Auxiliary blower motor resistor.

• Go To Pinpoint Test U .

 

[DeeeePIMPact]

Bedrck47 THANK YOU for the welcome and suggestions.

I apologize for not mentioning my front controls are EATC...

I tested all the blade fuses in the kick panel with a light tester. The fuse in #107 I switched with a similar fuse used to start the car, with the similar fuse removed the car would not start. I put the fuse that was in #107 and the car starts. I did not test any of the other fuses similar in style to the fuse at the #107 location.

I am pretty sure there is a short some where just a matter of where I guess... Having trouble finding it, and wire testing electronics is not my forte Just trying to do as much as I can by myself.

I have already tried to jump the rear blower resister by grounding the Orange/Red wire on the resistor and still no joy

Are there any other fuses besides the 1 at the #107 location I should be looking at? I tried measuring continuity between the switch in the headliner console to the wire connecting the blower resister and no joy.

I tried measuring for voltage at the blower resister and it fluctuates... Again wire testing is not my forte so I am not confident in my voltage findings.

Because of wire testing not being my forte could you explain what to test, where and how and I can tell you what I find?

THANK YOU for your help & quick response Bedrck47!!

 

[DeeeePIMPact]

I guess I am going to go try to find the location of the Auxiliary blower motor relay and try to figure out a way to test it...

 

[Bedrck47]

Did the blower work prior to you replacing the Condenser

 

[DeeeePIMPact]

Yes

 

[Bedrck47]

Auxiliary blower motor relay is located over the passenger side rear wheel well see attached print

 

[DeeeePIMPact]

I know of the fuse box in the passenger side kick panel, is there another fuse box some where? IF so, could you please tell me where? I keep finding references to the Ford Expedition 3rd generation – fuse box – power distribution box but can't find it anywhere...

I am guessing that is where the Auxiliary blower motor relay is according to diagrams. Just having trouble finding it

 

[DeeeePIMPact]

Thank you Bedrck47! Going to go see if I can find it

 

[Bedrck47]

The 03 only has ONE fuse box

One common problem that could cause you blower motor not to run would be if you disconnected the ground wire for the blower relay and motor when you made the repairs.

You need to find the relay and check to see if you have voltage going into the relay both for the relay coil and for the contacts.

The relay receives its power from the EATC and that will cause the contacts to close The contacts receive power from fuse 107

 

[Bedrck47]

Blower wiring diagram

 

[DeeeePIMPact]

AWESOME SAUCE! Thanks for the diagrams! You're a life saver! Unfortunately, I can't access that fuse relay area because I need to remove the lower part of the seat belt and I do not have the "star hex" to be able to remove it

Going to go try to find the tool to get the lower seat belt off so I can remove or at least move that paneling...

 

[Bedrck47]

Some additional fuses for you to check You may need to have the key in the run position for some of these fuses

#33, #11, #116, #5 and #13 These fuses are mainly for the EATC system but the EATC is what controls the aux blower motor

 

[DeeeePIMPact]

The only thing that was removed during the repairs of the condenser was the condenser which included the wire that was connected to the condenser which I made sure was reconnected yesterday.

At no point did we go into the back end of the truck, much less remove the paneling back there.

 

[Bedrck47]

AWESOME SAUCE! Thanks for the diagrams! You're a life saver! Unfortunately, I can't access that fuse relay area because I need to remove the lower part of the seat belt and I do not have the "star hex" to be able to remove it

Going to go try to find the tool to get the lower seat belt off so I can remove or at least move that paneling...

Look at the top of the molding I believe there is a tray that can be removed Not sure but worth a check

 

[DeeeePIMPact]

I might be able to get to the relay by pulling on the paneling.. In the diagram you provided what part is the Blower Relay?


Guessing C406, but wanted to be for sure.

 

[Bedrck47]

C410 and C411

Let me know when you get the relay located There are some voltage test that you can make

 

[DeeeePIMPact]

Okay FINALLY got the tool to get it off and I now have the paneling removed in that area... I tried to take some voltages off 1 of the plugs (C410) and the voltage was again fluctuating and numbers weren't in the 14.5 range like I was expecting.

 

[Bedrck47]

If you can remove the relay do so then look at the relay and you will see a print of the pin layout for the relay.

You are looking for pin #86 and Pin #30 Take your volt meter and insert one lead into the slot for pin #86 and one lead to a solid ground point You should read battery voltage.

Then do the same thing for the slot for pin #30.

You may have to have the engine running and the EATC and Manual controls set for the rear fan to run.

Post the results