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AC 50% working

4793 Views 10 Replies 6 Participants Last post by  macnax, 
macnax
Since summer only got started now in Belgium, I've noticed that the AC only blows cooled air out of the passenger vents. The drivers vents blow somewhat cold air, but not at all AC cooled. I'm however not on "dual mode".

I'm also in the assumption that the coolness of the air could be better, even via the working vents. If I feel my BMW's AC, it's much colder.

The dealer says its some kind of valve piece thingy that is "probably" stuck, but getting parts is a pain in the #$$*.

Anyone an idea on what it could be? Things I can check to make sure it's installed correctly? I'm also wondering, is there any Macguyver way of fixing it?
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Harleyguy
If its blowing cold on one side and warmer on the other side it could one of two things . One have the dealer or any local place you trust do a AC service the amount of freon to recharge the system is printed on a label under the hood .
The second thing it can be the car has the older style AC module if it has the older style its unable to be programmed by software . Later one can get the latest software and run the calibration program.
You can try something that's easy while the car is in AC mode cycle though the vent positions and cycle the temp from hot to cold leaving the setting in each position for a few seconds . One of the damper motors might not adjusting the position all the way
I'am willing to bet its a little low on freon .
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macnax
I'll try the cycle through the vent options trick. Keep you posted. If that doesn't do anything, I'll try the freon.
I've got an VIN 26xx so I suppose I have the latest model.

Thx
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E
I have vin 2605 and had the same trouble. Frank Kent Ft. Worth changed out my a/c module in late Fall 2012 and the problem was fixed. So, I suggest that a late vin does not necessarily mean you may not have an a/c module problem.


Sent from my iPad using Tapatalk HD
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Stefan
Are we owners able to check, whether we have an old or new A/C module?

Software? Part number? Color? Wiring?


Stefan
German Karma Forum
www.karma-forum.de
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Harleyguy
Stefan said:
Are we owners able to check, whether we have an old or new A/C module?

Software? Part number? Color? Wiring?


Stefan
German Karma Forum
www.karma-forum.de
Click to expand...
Two whys to check the first one is using the work shop tool we can tell that way . The other is to remove the module on look at the last four number of the part number which can be 1004/ 1005 the unit is located under the right side under the knee bolster. If you look under the right side below the glove box there is the panel the contains the foot well light . You need to remove that panel it's help in place by 3 tabs you have to pull on it pretty good usually the metal clips stay in the mount instead of the panel . You just need to squeeze them to get them to release and then you can mount them back onto the panel . After the panel is removed the AC module is right their two Phillips screws hold it in place if the label is visible with the part number no reason to remove if you can see the label you have to remove in order to see the part number .
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8AVGMPG
Harleyguy said:
Two whys to check the first one is using the work shop tool we can tell that way . The other is to remove the module on look at the last four number of the part number which can be 1004/ 1005 the unit is located under the right side under the knee bolster. If you look under the right side below the glove box there is the panel the contains the foot well light . You need to remove that panel it's help in place by 3 tabs you have to pull on it pretty good usually the metal clips stay in the mount instead of the panel . You just need to squeeze them to get them to release and then you can mount them back onto the panel . After the panel is removed the AC module is right their two Phillips screws hold it in place if the label is visible with the part number no reason to remove if you can see the label you have to remove in order to see the part number .
Click to expand...
I'll save everybody the trouble of doing this. If your VIN ends in CA001288 or later, your car was built with the latest HVAC module (ECU).

If you VIN ends in CA001287 or earlier, your car was built with the old module, but if you complained about A/C or heater performance at some point it was most likely replaced.
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L
Do you know if there's a difference at all between revision 1004 and 1005 for the HVAC module?
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8AVGMPG
software
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L
The software is flashed via PRODIS. Both the 1004 and 1005 modules can both take 510. Care to be a bit more specific?
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macnax
I've tried the cycle thing you suggested, but with no luck. My car gets services within 2 weeks, so I'll ask them to check on the freon.

Fingers crossed
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