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  #1  
Old 05-01-2014, 05:58 PM
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AC Hot on one vent only

2007 X5 4.8l, it's always been a bit wimpy in the AC area, but finally measured something.

Of the four vents in the front, with the AC running after about a 10 minute drive (car previously pretty), measured these temperatures:

Driver left vent: 60 degrees
Driver right vent (center set, left side): 61 degrees
Passenger left vent (center set, right side): 82 degrees
Passenger right vent: 71 degrees

While the far right vent was too warm, the 82 is the real problem.

I cycled to heat on that side (cranked just right side to 85 degrees), and both right vents got quickly very hot (I did not measure). Cycled back, in 30 seconds or so it was back down to 82-83 degrees.

As I ran it longer, it cooled, but what I think I'm getting is ambient temperature out of that vent, so as the car overall cools, that vent cools a bit.

What could cause one vent to not be cooling? Is it anything user fixable, e.g. some damper that is fairly accessible?

I've got a few months left on extended warranty so probably will just take it in, but if it's something simple I'd like to just fix it.

PS. I think it's probably been this way from day 1. The car is always slow to cool, but my wife is cold natured and turns the vents away from herself, and would never complain about warm air even in summer. But I think loss of this important center vent's cooling may be contributing to how slowly the car cools.

PPS. I didn't measure the back vents, but by hand they feel slightly warmer on the passenger side also, but both felt like cool air. I.e. more like the 71 above, not 82.
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  #2  
Old 05-01-2014, 09:11 PM
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Did you check "Upper body region temperature" settings in Climate Control settings/Vent Settings? You can adjust there from hot to cold independently for driver and passenger.

Operation is described in the 2007 X5 Manual on page 103 (you can find it on BMW USA web site).
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  #3  
Old 05-01-2014, 09:26 PM
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Yes, it's on auto, but I also forced it on manual to the coldest without change.
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  #4  
Old 05-02-2014, 02:17 AM
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sounds like your radiator is leaking, get it checked out.
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  #5  
Old 05-02-2014, 07:51 AM
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Quote:
Originally Posted by pio View Post
sounds like your radiator is leaking, get it checked out.
Not sure what your association is.

I would think that you might have an issue with the heater valves. They are located on the driver's side engine compartment near the firewall and under the expansion tank. Sounds like the passenger side might be stuck in a position that allows hot coolant into the heater core.
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  #6  
Old 05-02-2014, 09:36 AM
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Quote:
Originally Posted by Xtony View Post
Not sure what your association is.

I would think that you might have an issue with the heater valves. They are located on the driver's side engine compartment near the firewall and under the expansion tank. Sounds like the passenger side might be stuck in a position that allows hot coolant into the heater core.
Thank you. I'll look, and see if I can see where that is. Are they readily accessible from above, or is this something that really needs to be done on a lift by a real mechanic to check?
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  #7  
Old 05-02-2014, 10:03 AM
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I had this issue with my previous X5 and it was low on freon. I checked mine using my a/c gauges to verify and sure it was low. I had the driver side only blowing cold air while the passenger side was blowing just regular/not cool air. I added almost a bottle of R134a. But make sure you don't overfill system with freon since it will make your a/c not to blow cold air. I might have had a slow leak since a/c system should not lose freon.
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Last edited by Thirdy; 05-02-2014 at 10:12 AM.
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  #8  
Old 05-02-2014, 11:53 AM
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I had the same problem. Just added freon from pep boys and it's working great.
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  #9  
Old 05-02-2014, 02:04 PM
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I recently experienced this issue as well on my X5 4.8i. The passenger side vents were blowing warm air, but the driver side vents were fine. I took it to my indy shop and they evacuated the system and recharged it with Freon and added a dye to it. They could not see any leaks at the time but told me to keep an eye and see if the AC starts blowing warm again. That was about 2 weeks ago, and the air is cold now on both driver and passenger side vents since I got it back from the shop. Not sure why it would be low on Freon since I understand the A/C system is a closed system, but that's been my experience so far. If it changes I will update you guys. . .
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  #10  
Old 06-09-2014, 11:04 AM
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Recharge fixed it

I never made any progress so took it into the BMW dealer. They immediately said it needed a recharge, that this is how low charge presents in the X5. They charged it and it's colder than it ever was -- makes me wonder if it was low from the very beginning.

They said to come back in a couple months to check for leaks.

They could not explain why it works that way -- hot on one side when low on charge.
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