I have the same prob i never know whats in there it sounds like theres somthin stuck in there and crawling around. Can some one tell me whats a servo so i can get this prob fixed im new to some of these Lexus probs

 

Mine makes noise early in the morning. It sounds like something is trying to open and close. I rarely use my a/c or heater too.

 

servo controls are heat/air/mode functions
https://www.clublexus.com/forums/gs-...vo-motors.html


yeah they have been known to get in their

look at this thread
https://www.clublexus.com/forums/gs-...-the-dash.html

servo going dead

 

How can you tell which side of the servo is being bad?

 

not which side....but which one. well what is it doin? easiest way is to touch them on start-up when they start chattering. you'll def know then

 

I'm having the same tapping problem on the passenger side, but only every now and then. Only thing is I had an a/c issue before i started to hear the tapping. i have a 98 with oem navi, when i turn on the a/c i hear everything turn on, but no air comes out. When i change the air positions i hear servos working as they should but still nothing comes out. Could this be a servo problem too? Forgive me if I'm getting off subject, i'm fairly new to this.

 

is your blower coming on? mine used to tap every now and then also but eventually they will always tap

 

No the blower doesn't work when i turn on the a/c. i connected a 12V battery directly to the blower and it works fine. All the controls work fine too, everything changes the way it's supposed to, but there's still no air. I was told by one guy i should replace the blower motor control. any other ideas?

 

break out the meter and see if your getting power to the blower. obviously somewhere your not if u can connect direct power to it and it works. time to start chasing wires.... i hate doing that

 

actually i did check that and i'm gettin the 12V to the blower but it still doesnt work, only when direct power is applied. a mechanic said it's probably just a button or a swtich. the dealership said it was the blower motor control or resistor. i'm not sure whicih one to replace, i'm thinkin to just replace them all.

 

well something is DEF not getting power right. i dunno. gonna start getting costly to replace all that stuff though. GL