Driver's Side Warm, Passenger side cold, + no codes

[EPR145]

Compressor lines are cold also. There were no codes whatsoever in the driver info display. Any ideas? Actuator perhaps?

[c4c5specialist]

Hi there,

Yes, possibly the actuator, but give it time as the codes may come.

Allthebest, c4c5

[Junkman]

One reason that I have seen this happen is because people spin the temperature knob to fast and the unit cannot compensate for the request. There is a process to recalibrate the actuators, but here is something that I found you can do that can possibly remedy the problem too.

1. Set the temperature to max heat with the unit off.
2. Turn the heat on with the fan set to high. Allow to blow for 30 seconds.
3. Turn the heat off.
4. SLOWLY lower the temperature to maximum cold.
5. Turn the air on to high and check to see if both sides are blowing cold.

This "bootleg" calibration usually works for me in a pinch when I've used it (about three times so far). I am now very cognizant of how fast I turn the temperature knob. You should be too.

[EPR145]

Thanks Junkman! I'll try that

Semper Fi

[EPR145]

Didn't work. Looks like I'll be off to the dealer. Hopefully they will use some Vaseline! lol

[leadfoot]

Pull and post your codes so C4-C5 can advise you on what you need. Way better than vasoline is to know what the issue is. If you need help accessing the codes post up

[EPR145]

Car isn't throwing any codes as of yet

[EPR145]

Finally threw a code BO 361 H

What next?

Thanks,
Jason

[Junkman]

B0361 - Left Actuator Feedback Short to Ground.

I can't tell you if it needs to be replaced or not (Paul will), but I do have 2 pieces of good news. If you do have to replace it, that is the easier one to do. The dash pad does not necessarily have to be removed. Secondly, there is the service manual recalibration process that you can try. Here is some information concerning your issue.

The HVAC control head receives an actuator position signal from the RH and LH electric actuators. The electric actuator position sensor is a potentiometer that is tied to a 5 volt reference source through CKT 1791 and to ground through CKT 1798, both from the HVAC control head. The variable output from the potentiometer feeds back a position signal to a pull-up resistor located in the HVAC control head. This signal is used to determine the necessary drive signal to the electric actuator motor to provide the proper air mix door position. This value is stored in the Keep Alive Memory (KAM) portion of the HVAC control head.

After replacement of either the LH or RH electric actuator has been completed, reinitialization of the actuators must be performed. Reinitialization can be easily executed by removing the HVAC CON MiniFuse® #27 from the Instrument Panel Electrical Center and then reinstalling the fuse back into its proper position. When the HVAC control head is first connected to power, the system will perform an initialization routine lasting approximately 60 seconds. During this routine, both RH and LH electric actuators will cycle full travel in both directions learning the end positions. Position feedback readings are sent back to the HVAC control head and compared to a range of acceptable end readings. If during initialization the position feedback readings are not within the acceptable range, a diagnostic code will be set. If the position feedback readings reach values of 0-5 counts or 250-255 counts, the HVAC control head will then interpret the reading as a "feedback-short" or "feedback-open" condition respectively. NOTE: Feedback-short or feedback-open conditions can occur due to electric actuators being initialized while not being attached to the HVAC module case

Re-Calibrating Actuators

Use the following steps to perform the calibration update:

1. Turn OFF the ignition.
2. Remove the battery positive voltage circuit fuse of the HVAC Control Module.

Important
The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.


3. Wait 60 seconds.
4. Install the fuse.

Let us know wjat happens. Also, try this in a timely manner (like today or tomorrow) as threads like this loose their interest and effectiveness when the OP doesn't check back for weeks.

[EPR145]

After clearing the codes through the DIC, now both B0361 and B0441 are showing up. :(