13' CC 4motion A/C issues

i have been having a problem with the A/C in my 13' CC. the A/C works, however i am getting different temps out of the left side dash and floor vent as i am out of the right side dash and floor vent. through VAGCOM, i am getting 20*C (68*F) out of the right side, and only getting 34*C (93.2*F) out of the left side (in direct sunlight and 90*F weather). i found in ETKA the temp sensor (#39 in the link https://nemigaparts.com/cat_spares/etka/volkswagen/cc/737u/819300/) and thought that may be the issue, as i have heard of these being a problem in MK6's. i bought two of them (1K0 907 543 E) directly from VW, replaced the left side, and still getting the same values.

i have put a temp gun on the vents and the values shown in VAGCOM are accurate. i have both the left and right side sync'd through climatronic on the lowest setting, so they should have the same cold air output

there are no faults found in Autoscan, 08-Auto HVAC, or in OBDII

any other temp sensors i should be looking for that may be the issue? climatronic maybe at fault? any output tests or anything i can do to narrow down the issue before i start throwing money at the problem?

What you're describing seems to be the classic V158 flap motor fault. Set temps to same and in module 08 measurement blocks compare what V158 and V159 are doing when changing temperatures in sync for both sides.

i'll have to look into this when i get home this evening siLc

nevermind, found this one with both V158 and V159...there are a ton of servo motors in this system

https://nemigaparts.com/cat_spares/etka/volkswagen/cc/737u/820200/

siLc said:

What you're describing seems to be the classic V158 flap motor fault. Set temps to same and in module 08 measurement blocks compare what V158 and V159 are doing when changing temperatures in sync for both sides.

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can you maybe provide a step by step process on how to do this? after opening 08-Auto HVAC, the "Measuring Block 08" selection was grayed out.

i went to advanced measuring blocks, as i did before, and measured the temps for both left and right sides, again as i did before. i also did an output test. some of the motors i could hear running, but the left and right side ones, i could not hear. i don't know if they were so hidden that the sound of them running is very muffled, or if both just weren't working

You're not looking at the temperatures themselves but the left and right temperature regulating flap indications. In Advanced Measuring Blocks, you can use the search function to look for "left" and "right". This should get you the right data. After having selected both left and right flap motor indications, set the cabin temperature to either low/high and press SYNC so when you change the temperature, it would happen in sync on both sides. Note how the left/right flap indications change - do they change in unison or would one lag behind or stay at a much higher/lower value? By the looks of it, left side (V158) would be the one to keep an eye on.

siLc said:

You're not looking at the temperatures themselves but the left and right temperature regulating flap indications. In Advanced Measuring Blocks, you can use the search function to look for "left" and "right". This should get you the right data. After having selected both left and right flap motor indications, set the cabin temperature to either low/high and press SYNC so when you change the temperature, it would happen in sync on both sides. Note how the left/right flap indications change - do they change in unison or would one lag behind or stay at a much higher/lower value? By the looks of it, left side (V158) would be the one to keep an eye on.

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oh okay, understood. the values i posted before are from selecting the left and right boxes, seeing the 14*C variance, at the lowest setting. i didn't even think to watch it as i change the setting on the climatronic panel

i'll do that this evening and report back tomorrow.

bringing this back from the dead. i removed both left and right flapper motors to inspect on the bench, as neither would engage when requested by VCDS. i took apart the casing and everything on the inside appears to be intact. i hooked up power to it on the bench and it would rotate, as i would expect it to inside the car, but it won't.........

this leads me to three possible scenarios, either A) there is a blown fuse, for which i have checked all of them and have found none, B) the climatronic module isn't working properly, thus not sending the proper signal to either left or right flapper motor, or C) there isn't a sufficient enough voltage being sent to the flappers

can anybody supply me with a wiring diagram so i can verify any of these findings?

zoidmk5 said:

can anybody supply me with a wiring diagram so i can verify any of these findings?

Click to expand...

erWin is the best place to get wiring diagrams, enter your Vin and get them appropriate to your car.