AC/heat will not blow through the floor vents

Tiny
MARK-CRO
  • MEMBER
  • 2005 CHRYSLER SEBRING
  • 2.7L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 167,000 MILES
When I turn on floor vents, the air comes out the defroster. Dash vents work. Only the floor vents don't. I was told to replace mode door actuator and I did. Still doesn't work.

I ran the diagnostic climate control test by myself and I got the following codes: 36, 33, 26. Thanks!
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Tuesday, December 3rd, 2019 AT 6:18 AM

6 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

I attached a picture of the mode door actuator. I want to be sure that is the one you replaced.

Roy
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Tuesday, December 3rd, 2019 AT 7:10 AM
Tiny
ASEMASTER6371
  • EXPERT
I found the codes for you but they have nothing to do with your issue.

The in car sensor is part of the control head.

Roy

IN-CAR TEMPERATURE SENSOR

ATC In-Car Temperature Sensor
imageOpen In New TabZoom/Print

The in-car temperature sensor is used in the automatic temperature control (ATC) heating-A/C system only. The in-car temperature sensor returns electrical signals to the body control module (BCM). The in-car temperature sensor is made up of two parts. One part is the in-car sensor aspirator motor assembly, and the second part is a temperature thermistor. The in-car sensor aspirator motor assembly attaches to the back of the A/C-heater control. This assembly has a small fan and a motor which draws air from the passenger compartment through the intake on the front of the A/C-heater control and past the in-car sensor thermistor which is located inside of the A/C-heater control.

In-Car Sensor Aspirator Motor Operation
imageOpen In New TabZoom/Print

Air is drawn from the passenger compartment by the aspirator motor, and flows over the in-car temperature sensor thermistor. The thermistor changes resistance with air temperature. The BCM measures this resistance and calculates the temperature of the air drawn into the A/C-heater control. The ATC system then makes adjustments to maintain the optimum passenger compartment comfort. Refer to the In-Car Sensor Aspirator Motor Operation table for when the aspirator motor is operating.

The in-car temperature sensor thermistor and aspirator motor are part of the A/C-heater control and cannot serviced separately. If faulty or damaged, the A/C-heater control must be replaced.
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Tuesday, December 3rd, 2019 AT 7:15 AM
Tiny
MARK-CRO
  • MEMBER
Thank you for your detailed explanation. :)

Yes, my mechanic replaced the mode door actuator (the one near the gas pedal).

From what I gather, you're telling me that the codes are related to the ATC and have nothing to do with the air not coming out of the floor vents. I actually don't mind if the Automatic temperature control isn't working because I can always use the manual control.

But I would like to figure out what is going on with the floor vents and why the air comes out of the defroster when I turn on floor vents.

Btw. I have done the reset test again (this time with car turned on) and got two codes now: 36 and 26.
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Wednesday, December 4th, 2019 AT 1:17 AM
Tiny
ASEMASTER6371
  • EXPERT
It looks like you have to replace the control head. That would explain the code and the floor vent issue.

Roy
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Wednesday, December 4th, 2019 AT 2:39 AM
Tiny
MARK-CRO
  • MEMBER
Okay, so I presume you mean this entire thing here: https://www.autozone.com/cooling-heating-and-climate-control/a-c-control-module/dorman-a-c-selector-mode-switch-599-129/270204_0_6207_5396

Thank you so much again. :)

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Wednesday, December 4th, 2019 AT 8:24 AM
Tiny
ASEMASTER6371
  • EXPERT
That is correct.

You are welcome.

Always glad to help.

Roy
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Wednesday, December 4th, 2019 AT 10:52 AM

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