Do I have a blend door issue?
Thread Starter
5th Gear
Joined: Jun 2024
Posts: 5
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Do I have a blend door issue?
Hi friends,
2017 LS460 base. Driver side a/c blows hot/cold as desired. Passenger side stays warm. A/C controls are set to LO most of the time and do not switch back to 75 like its a blend door issue.
Popped open the black cover in the glove box, appears that the blend door works. Did the error code check on the AC controls and got 53 55 56 93. AC code flush didn't help with anything. Defrost, face, foot vents seem to do what they should for both sides.
Driver Side Air Outlet Damper COOL Control Servo Motor Circuit
Driver Side Air Outlet Damper FOOT/DEF Control Servo Motor Circuit
Passenger Side Air Outlet Damper FOOT/DEF Control Servo Motor Circuit
Max Hot Bypass Damper COOL Control Circuit
2017 LS460 base. Driver side a/c blows hot/cold as desired. Passenger side stays warm. A/C controls are set to LO most of the time and do not switch back to 75 like its a blend door issue.
Popped open the black cover in the glove box, appears that the blend door works. Did the error code check on the AC controls and got 53 55 56 93. AC code flush didn't help with anything. Defrost, face, foot vents seem to do what they should for both sides.
Driver Side Air Outlet Damper COOL Control Servo Motor Circuit
Driver Side Air Outlet Damper FOOT/DEF Control Servo Motor Circuit
Passenger Side Air Outlet Damper FOOT/DEF Control Servo Motor Circuit
Max Hot Bypass Damper COOL Control Circuit
Last edited by CherryRound; Jun 21, 2024 at 04:41 AM.
Thread Starter
5th Gear
Joined: Jun 2024
Posts: 5
Likes: 0
Sounds like my issue specifically is with the Max Hot Bypass Damper COOL Control Circuit DTC:B1493/93 code for the passenger side. Can anyone confirm that the Max Hot Bypass Damper COOL Control Circuit code indicates an issue with a servo that controls how much warm/cold air is sent to the passenger vents?
Last edited by CherryRound; Jun 21, 2024 at 04:55 AM.
Intermediate
Joined: Aug 2021
Posts: 465
Likes: 204
From: VA
Did you check your AC line sight glass? The little window next to "H". It should be clear and you shouldn't see any bubbles or air. If you see anything other than clear liquid (freon) then you have a leak in your system, or the system is low and needs to be re-charged. Could be a small crack on the AC condenser, but idk your mileage. Just a thought.
Thread Starter
5th Gear
Joined: Jun 2024
Posts: 5
Likes: 0
I've somehow made things worse by messing with the controls and resetting things now the left hand driver is only blowing warm while the right hand driver is blowing cool. I was in the engine bay looking for the glass window for the high side when I noticed the actuator pump clicking on and off repeatedly.
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