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this is regarding the 4 zone ac on my car.

here is what i have observed so far:

When i start he car and turn on ac, the driver side (front and rear) feel nice and cold, but the passenger side (front and rear) feel much warmer.

It appears to me that something is not right and wanted to see if someone can help troubleshoot. the heat is not far away here in TX and i would like it resolved before then.

Where do i start, whac can be suspect, etc. looking forward to having this resolved.

Greatly aopreciate any help.

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OK. The Durametric cable came in today.

Here is what I see (these are the only codes I see in any section at all):

AIR CONDITIONING:

Part Number 11

Diagnosis Number 11

Current Fault Codes:

353 - Feedback from blower regulator front - Value below lower limit value

2600 - Temperature flap servo motor rear right

How much does this narrow down my search?

Would this explain the behavior I described above?

Much appreciate help with this. Thank you.

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353 is common and can be triggered from something as simple as low battery voltage. You need to investigate code 2600 but the first course of action is to clear all codes and address any that return. A low or failing battery can cause endless odd electrical problems on CAN-BUS equipped vehicles so be sure the battery/charging system is up to par.

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To make sure the battery charging system is up to par - does this vehicle have 2 batteries? I thought it did. If so, do both have to be checked?

I assume it would entail to verify batteries are fully charged to begin with? Like do a full charge on battery and then load test it to see if voltage drops below min levels (which would indicate weak battery).

Any other ideas? Test the alternator? How (is there a tool that will test it while in the car - I cant imagine having to take it out to test)?

Thanks again.

353 is common and can be triggered from something as simple as low battery voltage. You need to investigate code 2600 but the first course of action is to clear all codes and address any that return. A low or failing battery can cause endless odd electrical problems on CAN-BUS equipped vehicles so be sure the battery/charging system is up to par.

Edited by ciaka
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OK. Got more info.

I reset the fault codes on Air Conditioner.

The only code that returned was code 2600 Temperature flap servomotor rear right.

Also, I measured the temps out of the 4 main outlets:

Ambient outside temp: 72F

AC condition: Set to Mono, LO, automatic (full blast), air recirculation, all windows closed and all doors closed.

Measured temp of air coming out of the two front center vents, and out of the two rear center vents:

FT LT - 51F

FT RT - 71F

RR LT - 55F

RR RT - 71F

So looks to me that the right side of the car is blowing air much warmer than teh left side. If anyone can hep trboubleshoot for root cause, I would greatly appreciate it.

Edited by ciaka
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I set the temp on control panel to LO (in mono mode - all sides synced to same control temp as driver front).

Outside temp was 72F (as displayed inside car). Measured with my garage thermometer I took off the wall - it is about 4 inches long, I placed the mercury indicator right in front of each vent and held it there for about 3 minutes for each vent.

Car doors were closed, windows closed, car turned on idling.

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