Blower motor air flow control

Asked by Nov 17, 2012 at 03:16 AM about the 1999 Lexus RX 300 AWD

Question type: Maintenance & Repair

I replaced my blower motor controller today.  The air conditioner and heat is now blowing, but only from below where the feet vents are, there is no air flowing to the dash or vents by the windshield. I am unable to control the airflow.  I can control the air speed via the mode control knob, but not where it is going. I am unable to change the area to which it is to flow.  The arrows do change to different areas being the feet, chest, or windshield or both pertaining to the stick figure via the control knob showing where the air is to go, but it doesn't actually change levels or vents.  Also I see a site on the internet for a chip that is available to increase my gas mileage by 7 mpg's and slight increase in horsepower.  Is this true for the price of $65 per chip or will it cause issues with my fuel injection or other problems.

2 Answers


Im not sure about how ur lexus is set up, but the vehicles i have worked on, all of the doors in ur heat system, are ran off vacumn controls, i had one that was not working like that, would only blow air from the floor, well it turned out that one of the vacumn tubes got pinched off under a bolt, from a different repair, so somewhere to start. Im not sure if thats possible with what you had to do to replace ur switch, but if u had a lot of bolts to remove or somehow lines are pinched, that could be ur issue. Good luck.


I helped a co-worker with her 99's climate system. This is elaborate mechanically, accessed behind the glove box. The mode servo (floor/vent/defrost/mix), is likely, since air direction is the issue here. Lexus does not use vacuum lines, but electronics and motors to open and close those air doors. The servos run over $100, and while the repair is not difficult, access is, and quite involved. A Toyota dealer can repair it, or Toyota independent specialist, and for way less than a Lexus dealer.

6 of 6 people found this helpful.

Your Answer

Lexus RX 300 Experts

  • #1
  • #2
    John Orlando
  • #3
View All

Related Models For Sale

Used Toyota RAV4
488 Great Deals out of 67,764 listings starting at $1,995
Used Honda CR-V
536 Great Deals out of 67,395 listings starting at $1,800
Used Toyota Camry
807 Great Deals out of 71,840 listings starting at $175
Used Lexus ES 300
6 Great Deals out of 673 listings starting at $2,000
Used Toyota 4Runner
303 Great Deals out of 30,850 listings starting at $2,595
Used Honda Accord
540 Great Deals out of 94,361 listings starting at $1,300
Used Lexus GS 300
10 Great Deals out of 575 listings starting at $2,799
Used Lexus LX 470
11 Great Deals out of 291 listings starting at $4,786
Used BMW X5
318 Great Deals out of 17,285 listings starting at $2,991

Used Cars For Sale

2003 Lexus RX 300 AWD For Sale
64 listings starting at $3,800
2002 Lexus RX 300 AWD For Sale
120 listings starting at $3,150
2001 Lexus RX 300 AWD For Sale
111 listings starting at $3,200
2000 Lexus RX 300 AWD For Sale
113 listings starting at $2,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.