osetleo Posted November 27, 2014 Posted November 27, 2014 Today I drove my wife's 99 RX300 and found out that air coming from vents is not heated. Air temperature regulator changes temperature settings on the dash panel but that does not effect air temperature coming from vents. I checked heater fuses 50A and 15A and they are both fine Do you have an idea what could be wrong and what I should check? Thank you very much for your reply
osetleo Posted December 1, 2014 Author Posted December 1, 2014 Based on recommendations of some folks on the forum Irepaired the air-mix servo lastSunday. It was very difficult to unscrewthe top screw that was behind the 2 heater pipes. It was as difficult to screw it back. It is not clear what type of screwdriverfolks were using for this screw. Therewas no gap between heater pipes to get to this top screw and angling of normal(quite long and thin) screwdriver was not working well as it stripped thescrew. Anyway, when I removed the air mix server I opened it, removedold grease, cleaned all contacts with contact cleaner. I noticed a small movement on the gear thatsits on the motor shaft. I followedFROGGY’s procedure to move the stop to remove this movement and I also cleanedand glued this gear in this place. ThenI applied some grease to gears only-I used Sil-Glyde from NAPA autostore-andassembled the servo. Then I tested it operation just by connecting with itsconnector and by changing the temperature settings with ignition ON. Then I installed it back in its position Based on recommendations of some folks on the forum Irepaired the air-mix servo lastSunday. It was very difficult to unscrewthe top screw that was behind the 2 heater pipes. It was as difficult to screw it back. It is not clear what type of screwdriverfolks were using for this screw. Therewas no gap between heater pipes to get to this top screw and angling of normal(quite long and thin) screwdriver was not working well as it stripped thescrew. Anyway, when I removed the air mix server I opened it, removedold grease, cleaned all contacts with contact cleaner. I noticed a small movement on the gear thatsits on the motor shaft. I followedFROGGY’s procedure to move the stop to remove this movement and I also cleanedand glued this gear in this place. ThenI applied some grease to gears only-I used Sil-Glyde from NAPA autostore-andassembled the servo. Then I tested it operation just by connecting with itsconnector and by changing the temperature settings with ignition ON. Then I installed it back in its positionfighting as I mentioned with this upper screw. Tested again and air mix server worked. Please note, I marked up the position of all gears andregulating arm before disassembly. Thank you folks for wonderful posts on the forum fighting as I mentioned with this upper screw. Tested again and air mix server worked. Please note, I marked up the position of all gears andregulating arm before disassembly. Thank you folks for wonderful posts on the forum
Rogerm Posted December 7, 2014 Posted December 7, 2014 the actuators ( there are about 3 or 4) divert air from various locations to other locations. There contacts can get dirty. They are usually replaced. but can have the contacts cleaned. Fairly common problem in older Lexus RX300
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