I finished my servos this weekend, and what a difference! No more constant clicking, and more importantly, no more ice cold air into my face all the time (courtesy of stuck driver temp servo)! Feels like a new car again.

For those interested, here are a couple of photos. First, here are the three servos you'll need:



30371 is the passenger side mode servo
30341 is the passenger temp servo
30351 is the driver side temp.

I found the driver's side temp servo to be the easiest to replace, as I had to remove only a couple of items to get to it. Then again, in order to see it (and the mounting screws), I had to lay upside down in the footwell. I reclined the driver's seat as far back as it would go, and then layed down on the seat with my feet over the seat back and my head on the floor. Fun.

Being the engineer, I wanted to figure out if I could "fix" my servos instead of replacing them. So I took them apart to look for obvious problems. Turns out the gears were in perfect shape, so they were not what was causing the clicking:



I suspected that the problem was with the feedback loop of the servos, but to see the contacts, I had to remove the big gear in the above photo. Unfortunately, the big gear is permanently attached to the arm of the servo, so the only way to remove it is to break off the arm, by which point you are committed to replacing the servo anyway . Out of curiosity, I did that - here is the servo with the arm broken off:



Now I could see the contacts below the gear.



The contacts look perfect, no obvious signs of wear or burning. So really, even if I was able to remove the gear without breaking the arm, I would not have been able to "fix" the servo, not with any degree of confidence. I suspect that there is some tiny break in the gear side of the contact, but I could not find it easily, and even if I did, I am not sure how I'd fix it. Too much of a project, IMO.

So, all in all, I'd say if your servos are clicking, you might as well replace them, as I doubt any "fix" would last long enough to justify all the work required for access and removing and replacing these servos.

Hope this helps.

 

nice addition to this Leon and im glad you got yours fixed. yeah drivers side is truly the easiest but SADLY if you take it to a dealer they tell you that you have to pull the dash out to get to the drivers one. so they scam you for some EXTRA $....

DIY>SCAMMING DEALERS.

big win for us little independent DIY'ers

 

Wat sup guys i have an 01 gs300 and i've read alot of ya'lls threads and have realized that i to have this servo problem. But what i need to know is 1.if its the air mix servo (mode servo) in which i think is my problem will i have to replace both passenger and drivers side servo's? And 2. Would the air mix or mode servo be the cause of my ac not blow hardly out of the vents when the mode is set on vent. I mean i can have it on high and my temp set on 65 and the air will barely be coming out of my vent and u can feel air coming outta floor vent as well even though its set only on front vent? Please give me some help on this problem!!!

 

no, u shouldnt have to replace both, lol, the second issue u have can be one of two things either the mode servo or like mine is doing now, where my gear's on my HVAC box are striped and sometimes it wont move into the correct mode. i will be fixing this soon....before the winter

 

I started my GS4 the other day and nothing but hot air blows out of both driver and passenger zones. Is it possible both servo motors went out at the same exact time? Is there a fuse for the servo motors? I got code 00 from diagnostics, refrigerant pressure is good, clutch is engaging? Any ideas?

 

thanks for the write up, i will be doing this in the near future.

 

the temp servo is what should control the temperature on both sides and they have separate ones....would be odd to me for both to go out at once, less one was on its was out and just happened to. i mean it IS possible but unlikely. no fuse for the servos...

lol you will laugh but code 00 is a code for the system being normal. your servos could be completely removed and the system wont show a code for them

i have new servos in place on my passenger side and have issues with my drivers side temp servo. its recently started "misbehaving" and im needing to replace mine but to lazy to do it in the summer...the ac is working on my side, heat isnt so right now i dont need it

your welcome, if you have any issues, feel free to ask

 

i kinda do have a question lol. its just making the clicking noise (which is pretty annoying might i add). but im not having any of the same problems as anyone else. still blows cold (and hot when i tried it) from both passenger and driver. i havent had any issues other than the clicking noise. could this still be the problem?

 

your servo is starting to go, regardless now if you have the issues, you will if its making those noises. when i first bought mine it would do that but everything worked fine, then somedays it wouldnt work ok. IF its working right now and you can get over the noise, ignore it till its out or starts acting up....just dont go on a date its annoying to explain lol

 

Subscribed.... thanks for the great writeup Sakataj... I've seen you feel a bit underappreciated lately... or disappointed when you need some help, and it's not very forthcoming... but here's a big thumbs up for all your contributions to this board!!! Thanks again!!

 

TY, yeah that bout describes how i feel.....not so much the under appreciated but disappointed when i need some help.
thanks though man and your welcome,happy to help....to bad others arent so much

 

too late

on a brighter note i was so annoyed yesterday i kept playing with the ac controls and it stopped making the noise. hopefully it lasts till the fall when its not so hot.

thanks for your help, i know i will be using this later on lol.

 

lol yeah its embarrassing to explain why your "luxury" car makes such a noise....hopefully it will but dont count on that. im just ignoring my drivers side till the winter

 

the ballast on my aftermarket HID went out. i had to explain to the hwy patrol why it was out. then the next day i take it and get it fixed. the response was "dont put it on auto". my answer to that was, wtf did i buy a lexus for?

 

i ALWAYS leave mine on auto...hate when i take it in for tire rotations or stuff and people turn my headlights OFF... lol