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Need help with a/c fan speed
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Senior User
Joined: Aug 2007
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From: ATX
Need help with a/c fan speed
So recently the a/c in our truck seems to be stuck in the highest fan speed setting. Changes from either the steering wheel controls or the panel control do nothing to change the speed. When I try to turn the system to off completely it will go to what I believe is the vents and stay on full blast. I've ready on earlier years (98-99) that this problems mainly resides in the:
Blower motor resistor
MOTORCRAFT Part # YH1699 {#4L3Z19A706AA}
w/4 Pin Connector
but since ours has the dual zone a/c I'm not 100% sure since there is also:
Blower motor speed controller
YF3Z19E624AA
One is like $15 and the other is $130 so looking for thoughts before taking the plunge. Also, where is the blower motor resistor for an 2006 Expedition with the dual zone? I know where the blower motor speed controller is but not sure what to look for with the resistor. Thanks for any help!
Blower motor resistor
MOTORCRAFT Part # YH1699 {#4L3Z19A706AA}
w/4 Pin Connector
but since ours has the dual zone a/c I'm not 100% sure since there is also:
Blower motor speed controller
YF3Z19E624AA
One is like $15 and the other is $130 so looking for thoughts before taking the plunge. Also, where is the blower motor resistor for an 2006 Expedition with the dual zone? I know where the blower motor speed controller is but not sure what to look for with the resistor. Thanks for any help!
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Senior User
Joined: Aug 2007
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From: ATX
Thanks for clearing that up! It's the answer I was looking for, not it was also the answer I wasn't hoping for 
. Ah well, at least it's easy to get to instead of being a $500 fix. Oh btw, does the diagnosis sound accurate I assume? Anything else it "could" be?
. Ah well, at least it's easy to get to instead of being a $500 fix. Oh btw, does the diagnosis sound accurate I assume? Anything else it "could" be?
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Senior User
Joined: Aug 2007
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From: ATX
For future reference if it's needed by other peeps, the part number for the blower speed module is 6L1Z-19E624-A and it's located on the passenger side downstream from the fan. There is a physical connector between the two so it's hard to miss. Took all of 10 upside down minutes to replace and $40. Thanks again for the help Steve.
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I know this post is a little old, but doing a simple search sure saved me a lot of time and money in troubleshooting.
I was looking at the wrong part under the dash, so going to buy it sure helped because it looks like nothing else under the Passenger side. And, it is relatively easy- one screw and then wiggling it out.
I have hung around here for years because of knowledgable, friendly people. So, it was good to be able to say thanks.
bowandaero
I was looking at the wrong part under the dash, so going to buy it sure helped because it looks like nothing else under the Passenger side. And, it is relatively easy- one screw and then wiggling it out.
I have hung around here for years because of knowledgable, friendly people. So, it was good to be able to say thanks.
bowandaero
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This posting helped me as well, esp. straight from a Google search. My experience was similar to others. Bought the part 1st, which made finding the part in the passenger footwell very easy (8mm deep socket worked for my bolt). The only update from my experience was the part number from the Dallas Ford Dealer for my 2003 EB Expy was 2L1Z-19E624-AA $60.
Not sure if this was the cause, but my A/C fan first exhibited this problem after i had to jump start my battery....suspicious.
Thanks again to all the posters.
Not sure if this was the cause, but my A/C fan first exhibited this problem after i had to jump start my battery....suspicious.
Thanks again to all the posters.
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Fan Speed Control failure (shorted high)
Yes, this can be a costly fix. But can also be very cheap! My dealer wanted to charge $95 to diagnose and $220 to fix!! I know times are bad, and new cars sales are bleak, but why rape the owners on over priced service?
Here's the issue. The fan motor is controlled by a switching transistor (MOSFET). In the old days this was a variable resistor. Well, when MOSFETs fail, they can fail open or closed/shorted (in most cases). I think mine failed following a jump start. Anway, the MOSFET switches power to the motor at a variable rate similar to how a dimmer switch works in your home. When it fails short, the fan runs HIGH all of the time. My replacement part was 2LiZ-19E6240-AA. $70 to purchase and 10 minutes to install.
Or, if you are handy with a soldering iron, you can just replace the MOSFET (MJ11028) yourself. You can purchase this for $7 at Digi-Key - MJ11028GOS-ND (Manufacturer - MJ11028G)
Good luck!!
Here's the issue. The fan motor is controlled by a switching transistor (MOSFET). In the old days this was a variable resistor. Well, when MOSFETs fail, they can fail open or closed/shorted (in most cases). I think mine failed following a jump start. Anway, the MOSFET switches power to the motor at a variable rate similar to how a dimmer switch works in your home. When it fails short, the fan runs HIGH all of the time. My replacement part was 2LiZ-19E6240-AA. $70 to purchase and 10 minutes to install.
Or, if you are handy with a soldering iron, you can just replace the MOSFET (MJ11028) yourself. You can purchase this for $7 at Digi-Key - MJ11028GOS-ND (Manufacturer - MJ11028G)
Good luck!!
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
bade11 is right on the mark. The MOSFET can be replaced if you have some soldering skill.
However, the MOSFET itself rarely fails on those units. The problem is usually bad solder joints where it attaches to the board. I've repaired many of them with a quick touchup with a soldering iron and a bit more solder.
This has been an issue on many Lincoln vehicles with EATC since the late 80s.
+1 on Digi-Key. I never let their catalog get too far away.
However, the MOSFET itself rarely fails on those units. The problem is usually bad solder joints where it attaches to the board. I've repaired many of them with a quick touchup with a soldering iron and a bit more solder.
This has been an issue on many Lincoln vehicles with EATC since the late 80s.
+1 on Digi-Key. I never let their catalog get too far away.
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Good quick fix
lsrx101 That was right on.
I was "lucky" that none of the parts places carried the blower control. Went on line to find one when I read your post. Five minutes finding the iron and solder, waiting for temp, and reworking the joints on the 2 leads (not the case screws). And duh I was an electronic tech back in the 60's and 70's. Put it back together and smoooooth.
Thanks
A happy Lincoln owner.
Sorry I maintain robots for a competing mfr in Illinois.
I was "lucky" that none of the parts places carried the blower control. Went on line to find one when I read your post. Five minutes finding the iron and solder, waiting for temp, and reworking the joints on the 2 leads (not the case screws). And duh I was an electronic tech back in the 60's and 70's. Put it back together and smoooooth.
Thanks
A happy Lincoln owner.
Sorry I maintain robots for a competing mfr in Illinois.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
Likes: 5
From: Lorain County, Ohio
I'm glad it helped Sam Spastic. It's such an easy, common fix.
Did it help with yours pgonza2723? I'm curious.
Did it help with yours pgonza2723? I'm curious.
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