You did an awesome job!!!!

I know you went far and beyond with this thread. if you have a chance could you test the old servos and see if and how they failed. Or see if there was resistance in the box/arms/flaps that would cause these motors to fail. maybe you could prevent some from failing or keep failing. I think mine is starting to. Thanks man. i would if i had some to open up.

My analysis 10 years ago was that the contact arms lost their spring. I could bend them a bit and they would work for another 6 months. Possibly putting a piece of foam behind them might help them make contact.

Grinding/clicking under dash - air mix servo - Toyota Nation Forum : Toyota Car and Truck Forums

Just replaced both left hand side servos today - huge thanks to the OP for this thread. By FAR the best piece of advice was this:


The bottom right screw for the upper servo, and the upper right screw for the bottom servo, are right next to each other and inaccessible. I think typically the vast majority of the time needed for this project is on these two screws. Drilling a hole in the side of the box on the left, just above the fan, gives perfect access to these two screws. Magnetizing the screwdriver with a magnet makes putting them back in a breeze. A little Gorilla tape sealed the hole I drilled. I completed this entire project in less than two hours. Works perfectly now - big thanks to everyone who contributed.

P.S. I saved the old servo brackets, so if anyone needs them PM me. I'll send them to you for a few bucks shipping.

sUbscribed.

nice! thanks!

1. Thank you for the incredible detail and step-step walk through. This is immaculately done and I greatly appreciate it!

2. Do you recommend changing both servos for the convenience factor while having all that open and out? I took apart my glove box today and can feel the bottom servo buzzing/vibrating, but my temp can still be adjusted. The mode setting (top servo) is not changing. Just go ahead and change both, or knock the top one out?

3. Through this forum and talking to others, some recommend drilling a hole through air filter port to easily access the mount screws. Looking back, do you recommend this as opposed to going the route you took?


Thanks again for the amazing post.

Great post! Thanks for the step by step! I was having an issue with my temp servo only blowing cold or hot air. It would from one spectrum to the other. There was no way of adjusting the temperature.

I took my dash apart and unplugged the old one and plugged in the new one to test, and noticed the new one was doing the same thing? I watched the white center piece that moves the arm move once when I went from low to one step above? When i tried moving the temp higher, it wouldn't move even when I got all the way up to the highest temp. Any ideas on what else to check?

My guess is that the cabin temp sensor is not working right. It seems like it thinks the cabin needs heating at any setting other than LO.

The temp sensor is my thought as well, I would check it for a good connection and make sure it's not clogged/dirty with dust, it's located just under the ignition switch behind the little slots on the trim panel.

Thanks all! I'll check it this weekend and will let you know if that solved the issue!

It took me about 4-5 hours. Maybe it would have been quicker if I removed the dash? Dunno. It's doable if you are handy and have the patience. The risk of level is low, meaning the car will still be drivable; so if you can't get it back together you can always take it to a shop to bail yourself out.

The servos are a wear part so they will fail eventually. Knowing that, I'd replace both at the same time.


I didn't think to drill a hole, but it sounds like it would make accessing the screw a lot easier.

Yes, trust me - drilling the hole is the key. I bet I could do both servos at this point in an hour because all the time spent on the project is getting at those two bastard screws. All the other screws are fairly easy.

I also used a $10 ebay boroscope/camera connected to my phone to help get the screw in the right place along with magnetizing the screwdriver.

Holy crap, you drilled a hole? Wish you took a picture!

You were right! It was unplugged and the hose was disconnected. Must of happened when I got my alarm installed... SMH. Thank's all for the info!