Why is my AC / heater Fan not working? (EATC) system.

Tiny
DARYLYOUNG5
  • MEMBER
  • 2000 LINCOLN TOWN CAR
  • 69,818 MILES
My ac / heater fan control switch on my dash board appears to show operation however, when you select the Fan to increase or decrease blower. The blower does not operate at all but you can hear the AC ingage, just no air coming out through the vents no matter what vent selection I choose however, you can hear a "CLICK" when you go to the very highest setting and a "CLICK" again when you select just one notch below the highest setting, it will do this evertime yet no air coming out. I have done a few electrical checks already and will share them with you. First, I checked to see if their was power getting to my Fan under the hood with my test light, it showed power to both the orange & orange and black wires connecting to the Fan. Second, I checked all my fuses under the drivers dash and under the hood at the main block, I used my test light on each fuse and found their where (6) fuses showing no power to them so, I removed and checked each fuse condition and if they where blown there was no indication and I also cleaned the tips and reinstalled them, rechecked again and still no power to these (6). I also tested all Relays for operation and for heat damage etc, each showed they were operating correctly with power consistant to each one. I also cleaned their prongs as well. The "Click Noise" I hear is coming from under the hood from a electrical unit affixed to my HVAC system next to the firewall. I checked for power with my tester at the electrical wiring going inside the unit and found their to be power getting to that unit. I believe the unit is called a AC/Heater Fan Controller. Well, I hope you can help me as presently I do not have a repair manual on this 2000 Lincoln Towncar to do any further trouble shooting. Thank you. Daryl
Do you
have the same problem?
Yes
No
Wednesday, November 9th, 2011 AT 7:48 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
If there is power to the motor, chances are the motor is bad. Have you checked at the motor?
Was this
answer
helpful?
Yes
No
+2
Wednesday, November 9th, 2011 AT 8:55 PM
Tiny
DARYLYOUNG5
  • MEMBER
Jacob I also tested the Fan Motor by running direct connections from my +/- sides of my battery to both inside prongs on the fan motor connections having removed the electrical plug first so I could directly test the fan for operation or not. The fan is working great. One thing I just noticed today is that when I use my test light to check for power at the fan motor elect plug I get a very low light indication from my tester and I also get the same results when I test the same power wire running to the Blower Motor Resistor located inside the Hvac system on the firewall behind the engine. To me it gives the indication of a grounding problem. Do you agree. Because all my other electrical checks with my test light showed a very bright light indication. Thanks for you reply and Hope I hear from you again. Daryl
Was this
answer
helpful?
Yes
No
Friday, November 11th, 2011 AT 3:12 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Either a ground issue or there could be a power loss before the resister. Have you tried tracing the wire back to see if the power supply changes?
Was this
answer
helpful?
Yes
No
-2
Friday, November 11th, 2011 AT 3:19 AM
Tiny
DARYLYOUNG5
  • MEMBER
Jacob How do I do that? I am not sure how that is done exactly. Thanks again. Daryl
Was this
answer
helpful?
Yes
No
-2
Friday, November 11th, 2011 AT 3:26 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Basically, if you are using a test light, you are finding your own ground for the light. What to do is locate the power wire and trace it backwards all the way to the switch. Not a fun job, but can be done. While you follow it, poke the test light end through the wire insulation to see if there is a change in power. If there is, then you have narrowed down the problem.

Let me know if you understand. It would take 2 seconds to show you but an hour to write it. (Lol)
Was this
answer
helpful?
Yes
No
-1
Friday, November 11th, 2011 AT 3:31 AM
Tiny
DARYLYOUNG5
  • MEMBER
Yes I understand and your right its not a fun job but needs to be done as the object here is to determine if its a grounding issue or what if any part is bad that should be replaced. I really appreciate your help and if it is ok I will let you know any further progress as to what I find tomarrow. Thanks again Daryl
Was this
answer
helpful?
Yes
No
-1
Friday, November 11th, 2011 AT 3:38 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Daryl, You are welcome. It is people like you that keeps me here. I look forward to hearing from you. Keep me updated. Hell if you were a neighbor, we would be outside checking it together.
Was this
answer
helpful?
Yes
No
+2
Friday, November 11th, 2011 AT 3:46 AM

Please login or register to post a reply.

Recommended Guides