I replaced mine 2 months ago and now it quit again! Another $80, just replaced the bulk connector seal on transmission , $140 parts and fluid! 2009 with 114000.
Life is good

 

Actually it is testable. I had the same problem on my '10 Nav. I removed the module and tested the MOSFET under the black cover. The cover pops off quite easily and there's a MOSFET screwed to the large heatsink. Just check continuity across all three legs. Mine was a dead short across all of them. Very typical failure for a transistor. I ordered a new one from Mouser for $2 and soldered it in place. It's not the easiest soldering but take your time and it's very doable. The original part number is ST141NF55. That item is very hard to find because it comes with a certain automotive testing standard. I got the ST140NF55 which is the exact same ratings and has been working fine. Good luck to all.

 

Thanks everybody for the info. ScottG2011 especially. All good information.
Ordered the part online from Best Quality Auto Parts. $69.96 shipped, and they would let me return it if it wasn't the problem.
Installed it in about 45 min. (I'm very slow).
My world is right again.

 

Just wanted everyone to know, I put in a blower control module in my 08 Expy EL today. it had auto temp control. Bought the model at Oreilly auto parts. Works like a charm.
Thanks for this thread, my blower had been stuck on high for 2 months. When we clicked off, it just got stronger. After removing the old module and prying apart the cover, I did some basic ohmmeter tests and determined the chances of the part being faulty were strong. Cost was $69 plus tax. Thanks everyone and Merry Christmas!!

 

Hi ya'll, new to the forum

So earlier today when I left the house, the fan speed for the AC was stuck on high, so I browsed the forums, found that the resistor was probably the culprit. I popped into Oreillys got a new one (RU1266) and in 10 mins, the new one was in. I fired up the truck and now its the opposite, the high fan speed not working, but all the others are. Climate control works, until it tries to gets up to max AC, then the fan shuts down all together. Any ideas?? Its a 2009 F150 Lariat SuperCrew with the dual zone climate control
Thanks!!!

 

So earlier today when I left the house, the fan speed for the AC was stuck on high, so I browsed the forums, found the the resistor was probably the culprit. I popped into Oreillys got a new one (RU1266) and in 10 mins, the new one was in. I fired up the truck and now its the opposite, the high fan speed not working, but all the others are. Climate control works, until it tries to gets up to max AC, then the fan shuts down all together. Any ideas?? Its a 2009 F150 Lariat SuperCrew with the dual zone climate control
Thanks!!!

 

Thank you for this thread & simple repair. Bought part at dealer for $80, popped it in & works perfectly. Many thanks for those that help us simple DIY'rs keep 'em on the road!

 

Just did the replacement last night, thanks again...

 

Apologies for digging up an OLD post.
But, wanted to say Thank you. Had same issue with my 2011 F150 with dual climate control. Bought the part installed in within 15 minutes and bingo. works right again.

 

My blower stuck on high this week.

I despise the automatic blower control! Lol

.

 

I have the same exact problem. Same part. Did you ever figure it out?

 

John: How did they fix the vibration?

 

2011 lariat dual climate control auto AC with NO NAVIGATION stuck on high.... is the part i need yh1827? or yh1829? i think YH1829