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Old 06-27-2020, 10:29 PM
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AC Warm on passenger side

It was a humid day today and noticed that the passenger side AC was not really all that cold but the drivers side was cold. I know on my e38 this is usually a heater valve problem but those are a little different with the aux water pump integrated into them. I've read on the x5, this typically is a low gas issue or is this a heater valve issue as well?
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Old 06-27-2020, 10:31 PM
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My scanner shows both the left/right heater core temps and valve states left and right. A stuck heater valve is a lighter culprit


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Old 06-27-2020, 10:34 PM
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Quote:
Originally Posted by andrewwynn View Post
My scanner shows both the left/right heater core temps and valve states left and right. A stuck heater valve is a lighter culprit


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Sorry so you are saying a stuck valve in the heater valve?
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Old 06-27-2020, 11:48 PM
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My experience over 16 years with my e53 is that it's an indication of low refrigerant.

Check my recent post for two ways of checking for that:

https://xoutpost.com/bmw-sav-forums/...-two-ways.html

And the first time I diagnosed it with help from the great people on this forum and my mechanic:

https://xoutpost.com/bmw-sav-forums/...ht-thread.html

(Skip to the end of that thread for the solution.)
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Old 06-28-2020, 12:55 AM
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Quote:
Originally Posted by haigha View Post
My experience over 16 years with my e53 is that it's an indication of low refrigerant.

Check my recent post for two ways of checking for that:

https://xoutpost.com/bmw-sav-forums/...-two-ways.html

And the first time I diagnosed it with help from the great people on this forum and my mechanic:

https://xoutpost.com/bmw-sav-forums/...ht-thread.html

(Skip to the end of that thread for the solution.)
Thanks for the input! I have a friend who has a shop with one of those expensive AC machines. I will start with having him drain and refill the system properly and report back after...
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Old 06-28-2020, 10:40 AM
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Check with your friend as to whether you need to evacuate & refill or just recharge it. I've always done the latter. I'm interested to hear what he recommends.

You might want to replace the valves if doing the full service because, from what I've read, they are a common source of slow leaks. They're not that expensive.
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Old 06-28-2020, 11:20 AM
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- Or get some professional hose clamps that partially shut the heater hoses (don't squeeze it too much).

- Then drive the car and see if AC is better. If it does, then the problem is with the heater valve.
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Old 06-28-2020, 11:26 AM
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I'm doubting it's the heater valve now from the test listed in the linked thread of where the AC should be cold on a colad start and then warmer after the coolant warms up. The AC is always less cool to warm on the passenger side even on a cold start...
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Old 06-28-2020, 12:39 PM
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Just to confirm the evacuate and recharge, my daughter's e46 coupe was doing exactly the same thing. Fixed the issue.
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Old 06-28-2020, 06:43 PM
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That's a smart test. IR thermometer on the downstream hose also.

They make a hose clamp pliers specifically for closing off a hose. Great for changing parts wo draining the coolant.
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