Heat no AC

PMIMS1950

MEMBER
1999 CHRYSLER 300
4.0L
V6
2WD
AUTOMATIC
100,000 MILES

Atc heater code 23 [no A/C].

Saturday, May 6th, 2017 AT 9:24 AM

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,904 POSTS

Can you clarify the problem, do you have air coming out of the vents?

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Monday, May 8th, 2017 AT 5:29 PM

STEVE W.

MECHANIC
12,975 POSTS

Code 23 - Blend door feedback circuit failure.

Try this first-
HVAC SYSTEM CALIBRATION This procedure may be performed on both the ATC and MTC system.
1. Start engine and let run.
2. If the vehicle has an ATC system, turn the control head on.
3. Set the temperature controls to the full cold position for 2 minutes.
4. Set the temperature controls to the full heat position for 5 minutes.

If no effect then it is likely the blend door actuator has failed. I hope the re-calibration works. The actuator isn't hard to replace though, remove the underdash trim panels, then remove the crews from the actuator, pull it down, remove the connectors, reverse the process to install the new one. Then perform the re-calibration above.

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Tuesday, May 9th, 2017 AT 10:42 AM

PMIMS1950

MEMBER
2 POSTS

Yes there is air coming from all vents. Not switching from heat to ac. The ac works sometimes I will try the calibration.

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Wednesday, May 10th, 2017 AT 12:22 AM

KEN L

MASTER CERTIFIED MECHANIC
42,904 POSTS

Thanks for the assist Steve, if the calibration doesn't work then is it probably a blend door motor that has gone bad. Make sure you check the air door operation as well when the actuator is off

Here is a guide and some diagrams (BELOW)

https://www.2carpros.com/articles/replace-blend-door-motor

Please let us know what happens.

Cheers, Ken

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