Air flow stuck in front position
Thread Starter
Lexus Champion
Joined: Jan 2006
Posts: 3,763
Likes: 6
From: TX
Air flow stuck in front position
Hi
since the last few weeks, the air on my 2001 RX300 is stuck to the front position. I put it in Auto, it shows blowing hot air ot the feet, but the hot air still comes out of the front vents. If I manually change the position, the icons change but the air still blows out the front. I also not not hear any clicking or buzzing sound indicating the gates are being opened / closed.
What could be the problem? Any ideas?
TIA
since the last few weeks, the air on my 2001 RX300 is stuck to the front position. I put it in Auto, it shows blowing hot air ot the feet, but the hot air still comes out of the front vents. If I manually change the position, the icons change but the air still blows out the front. I also not not hear any clicking or buzzing sound indicating the gates are being opened / closed.
What could be the problem? Any ideas?
TIA
Lexus Champion
Joined: Feb 2008
Posts: 1,709
Likes: 16
From: Ca.
Hi
since the last few weeks, the air on my 2001 RX300 is stuck to the front position. I put it in Auto, it shows blowing hot air ot the feet, but the hot air still comes out of the front vents. If I manually change the position, the icons change but the air still blows out the front. I also not not hear any clicking or buzzing sound indicating the gates are being opened / closed.
What could be the problem? Any ideas?
TIA
since the last few weeks, the air on my 2001 RX300 is stuck to the front position. I put it in Auto, it shows blowing hot air ot the feet, but the hot air still comes out of the front vents. If I manually change the position, the icons change but the air still blows out the front. I also not not hear any clicking or buzzing sound indicating the gates are being opened / closed.
What could be the problem? Any ideas?
TIA
Lexus Champion
Joined: Feb 2008
Posts: 1,709
Likes: 16
From: Ca.
Here is the procedure for the self diagnosis. https://www.clublexus.com/forums/rx-...sn-t-work.html
Last edited by code58; Oct 17, 2010 at 11:27 PM.
Thread Starter
Lexus Champion
Joined: Jan 2006
Posts: 3,763
Likes: 6
From: TX
I wish I could help more Chikoo, the RX is my DIL's, I'm only the volunteer mechanic on it. I remember someone posting a trick where you can put the controls into a mode where they will read out a trouble code in the "display" window. I believe it reads out a # and you have to look up the # to see what the problem is. Self diagnosis in other words. If I had the manual I could look and see if there are fuses or relays, but the manual is with the car. I've done a lot of electrical work and have the equipment to diagnose, but that's pretty much hands on work.
Here is the procedure for the self diagnosis. https://www.clublexus.com/forums/rx-...sn-t-work.html
Here is the procedure for the self diagnosis. https://www.clublexus.com/forums/rx-...sn-t-work.html
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Driver School Candidate
Joined: Oct 2010
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From: TX
Pit Crew
Joined: Sep 2009
Posts: 109
Likes: 5
From: MA
Mode servo controls where air comes out - floor, dash, defrost - corresponds to the 'mode' **** on the dash.
Sounds like your mode servo is faulty. Removing, opening it up, and cleaning can sometimes fix it. Worked for me with the mix servo. Many posts on the topic. Search for 'air mix servo' or just 'servo'.
Lexus Champion
Joined: Feb 2008
Posts: 1,709
Likes: 16
From: Ca.
Mix servo controls the mix of hot and cold air - in other words the temperature of the air coming out.
Mode servo controls where air comes out - floor, dash, defrost - corresponds to the 'mode' **** on the dash.
Sounds like your mode servo is faulty. Removing, opening it up, and cleaning can sometimes fix it. Worked for me with the mix servo. Many posts on the topic. Search for 'air mix servo' or just 'servo'.
Mode servo controls where air comes out - floor, dash, defrost - corresponds to the 'mode' **** on the dash.
Sounds like your mode servo is faulty. Removing, opening it up, and cleaning can sometimes fix it. Worked for me with the mix servo. Many posts on the topic. Search for 'air mix servo' or just 'servo'.
Lexus Champion
Joined: Feb 2008
Posts: 1,709
Likes: 16
From: Ca.
Chikoo- I would suggest you pull the cover under the R side of the dash and then pull the glove box and door assy. Then operate your controls and you'll be able to SEE which one isn't working properly. You know now that the UPPER one is the MODE SERVO and the LOWER one is the AIR MIX SERVO, so you'll be able to actually watch and see which one isn't doing it's job.
Thread Starter
Lexus Champion
Joined: Jan 2006
Posts: 3,763
Likes: 6
From: TX
Shucks... I thought mode servo meant outside air or recirc air mode. Glad i did not swap out any. Anyways the mode servo(top) is not responsive at all when i change modes. Doesnt even try to move. I cleaned plug contacts but to no avail.
Thread Starter
Lexus Champion
Joined: Jan 2006
Posts: 3,763
Likes: 6
From: TX
Pit Crew
Joined: Sep 2009
Posts: 109
Likes: 5
From: MA
The contacts to clean are actually inside the servo. There's brush style contacts in there that sense the servo arm position. You have to remove the servo and open it up to get at them. Did this recently on the mix servo and it's worked fine since. Mode servo is much easier to remove than mix so you're in luck there...