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Discussion Starter · #1 ·
Hi all,

I'd say over the last 12 months or so I've noticed a declining quality of 'cold air' coming out of both vents on my 2015, dual-zone equipped 120d.

Maybe 6 months or so ago the passenger side was blowing ice cold, yet drivers side was mildly cold, yet manageable. Yesterday driving from Manchester to London, the outside temp was 30 degrees, but with my A/C set to 16 on both sides - it was blowing hot air! Needless to say, stuck in traffic with the windows fully down was completely useless.

When the A/C is on in general I feel like I can hear a light 'hiss', or it just sounds like some kind of start-up function that doesn't seem to end. It doesn't seem as quiet as it once was, if that makes any sense?

A quick Google is telling me it could be a compressor fault, a leak, or a re-gas is needed?

Any suggestions or similar experiences would be appreciated,

Thanks!
 

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Cheapest place to start is re-gassing - it's definitely what I would do before anything else.
 

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Definitely sounds like you a leak somewhere. All places, well reputable, that do a re-charging service will do a check beforehand to make sure there isn't a leak before wasting gas. Most systems have a low pressure gas switch which will cut the compressor running to minimise damage.

Hope it's not an expensive fix for you.
 

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Just somewhere in Manchester! This morning however one side has just started blowing warm again - so I'm thinking I might have a slightly more serious underlying.

Has anyone got a rough diagnosis or experience with this? Regassed in June - possible leak?
Hi Elmo, had a similar issue in my E91, had it regassed, it worked for a while then warmed up again, had a pressure test and a joint was leaking, new hose and it was sorted.
 
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Where did u get it done for such a low price?

Have a look at this Groupon link
Has anyone got a rough diagnosis or experience with this? Regassed in June - possible leak?
You could buy a AC Pro guage from Halfords, they check the pressure at the low (L) port so you would have an indication if it has lost pressure. There is a canister of R134a (or R134yf the eco version that apparently lasts half as long and costs more) which can be bought to top it up but it's very much a short cut which doesn't take account of pressure at the H port and may not leave the correct oil gas ratio. Also, if you have had a regas already and the guage shows low pressure, there is something wrong.

Did this place somewhere in Manchester have the correct equipment, I imagine some might just try and get away with the can method if they are able.
 

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Discussion Starter · #10 ·
Have a look at this Groupon link


You could buy a AC Pro guage from Halfords, they check the pressure at the low (L) port so you would have an indication if it has lost pressure. There is a canister of R134a (or R134yf the eco version that apparently lasts half as long and costs more) which can be bought to top it up but it's very much a short cut which doesn't take account of pressure at the H port and may not leave the correct oil gas ratio. Also, if you have had a regas already and the guage shows low pressure, there is something wrong.

Did this place somewhere in Manchester have the correct equipment, I imagine some might just try and get away with the can method if they are able.
It was a proper establishment, took them about an hour to do - but I'm not sure if it would take the same length of time from a can?!
 

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Discussion Starter · #11 ·
Hi Elmo, had a similar issue in my E91, had it regassed, it worked for a while then warmed up again, had a pressure test and a joint was leaking, new hose and it was sorted.
This is interesting - just trying to get some quotes for an assessment using whocanfixmycar.com but everybody seems to be reluctant to help!

What kind of costs are we looking at for a new hose + labour, if that is the problem?
 

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This is interesting - just trying to get some quotes for an assessment using whocanfixmycar.com but everybody seems to be reluctant to help!

What kind of costs are we looking at for a new hose + labour, if that is the problem?

Hi Elmo, it was a long time ago and I really can't remember so it probably wasn't that much or I would!
 

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It was a proper establishment, took them about an hour to do - but I'm not sure if it would take the same length of time from a can?!

The can method would take half an hour max but there is nothing to say it's not drgged out. If it was a reputable place, I doubt they would use a can, I was just mentioning it so if you go back there, you can check in a roundabout manner, it might be fine for a slight top up but for something that's lost a lot of pressure, not ideal. Having said that, they use cannisters in the US all the time, readily available in Walmart, Pepboys etc.
 

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This is interesting - just trying to get some quotes for an assessment using whocanfixmycar.com but everybody seems to be reluctant to help!

What kind of costs are we looking at for a new hose + labour, if that is the problem?
If your based in Manchester speak with Darren woods in stockport
 

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Gave them a ring and the guys sounded pretty confident that it might be an issue with the heater matrix? However they said that even for an accurate diagonsis they'd have to remove the entire dash, at roughly 8 hours labour! (£72 inc VAT)
I'm guessing that's 8X72?
 

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Discussion Starter · #18 ·
Just out of curiosity - could a dying battery be the cause of my A/C issue(s)? My F20 is just over 7 years old, with no other electrical faults or noticeable power/voltage discrepancies. Maybe sometimes a pause in start/stop kicking in, but I just thought that was maybe just a random hiccup.

I’ve noticed the 'standby time', as in the period of time you can sit in your car with the ignition off and iDrive on, feels like it's gotten much shorter recently, maybe less than 5 minutes - whereas I'm sure this used to be closer to the 10/15 minute mark?

I've been away for a week and just had a 2 hour drive, and noticed the A/C behaving normally, but the air flow from the passenger side feels like it's become weaker?
 

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Many, many things can occur as a result of a failing battery, but you definitely have an air con issue and that is 99% likely to do with gas loss in the system
 

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Discussion Starter · #20 ·
Many, many things can occur as a result of a failing battery, but you definitely have an air con issue and that is 99% likely to do with gas loss in the system
The behaviour of my A/C in the last few days is incredibly eratic. Today it's been fine, blasting ice cold on both sides with no weakness in airflow on both passenger and drivers side. Got it booked in at a BMW specialist for Wednesday, looking forward to seeing what the diagnosis is!
 
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