[Stripesmeow]

Hi all, I'm hopeful someone may be able to help where two garages could not.

Car is an 07 2ltr turbo petrol FSI.

When driving the car for an hour or so the cold air stops blowing thru the vents even though I can hear the fan motor going. I turn up the fan speed and the fan gets louder - just no air comes out thru the vents. Not fun on a 30deg Aussie day.

This issue cures itself when the car is turned off for a while but then reoccurs after another hour or so of driving. I can't be certain but me experience has also been that after dropping back to city speeds from highway speeds the issue also fixes itself.

The workshop ran a diagnostic but no issues were found.

I've seen a few similar posts but no 'cure'.

Any ideas for a fix would be greatly appreciated.

 

[silvershadow]

This problem is often caused by the air conditioning evaporator "icing up" due to the temperature sensor failing or being set incorrectly. When the system is operating, condensate forms on the evaporator matrix and this will turn to ice and block the airflow if the system does not cycle correctly.

A car air conditioning specialist will be able to test and adjust/repair your system to fix this problem. This is a common problem here in Australia.

 

[Stripesmeow]

Thanks Silvershadow! I was thinking that perhaps I should take it to an a/c specialist instead of a general workshop. Kind of like going to a specialist instead of a GP! I'll let you know how I get on.

 

[Stripesmeow]

Just thinking about this potential 'icing up'. Could that be why when I park the car in the garage there's always a small pool of water forming on the ground under the engine area?

 

[silvershadow]

Just thinking about this potential 'icing up'. Could that be why when I park the car in the garage there's always a small pool of water forming on the ground under the engine area?

Most definitely yes but this is normal even in winter if you leave the climate control system permanently on. I would be expecting a large quantity of water after you drive the car sufficiently long enough for the loss of airflow to become evident if icing is the problem.

 

[Stripesmeow]

Thanks for your help silvershadow. This gave the a/c guy a good lead on what to diagnose. The problem ended up being the Thermistor Temp Sensor (about $400 fitted although the part was only $90). It seem the air coming out of the vents was -2degrees even when the temp dial was on 20degrees. Basically the a/c compressor was not getting the right signal from the temp sensor and was running on full cool all the time. Even when they froze the sensor the car's computer still registered 20+ degrees. Anyway, all sorted now. Thanks for your help!

 

[silvershadow]

Thanks for your help silvershadow. This gave the a/c guy a good lead on what to diagnose. The problem ended up being the Thermistor Temp Sensor (about $400 fitted although the part was only $90). It seem the air coming out of the vents was -2degrees even when the temp dial was on 20degrees. Basically the a/c compressor was not getting the right signal from the temp sensor and was running on full cool all the time. Even when they froze the sensor the car's computer still registered 20+ degrees. Anyway, all sorted now. Thanks for your help!

Thanks for the feed back - I am pleased I was able to help you using my own experience of a similar problem more years ago than I care to remember .

This is what our forum is all about; sharing knowledge and experiences .

 

[voxmagna]

Silvershadow, this failed temperature sensor problem in the a/c has cropped up a few times now.

Is the sensor part of the sealed gas loop so the system has to be de-gassed and refilled to change it. I'm wondering why the labor seems expensive if I have to fix this myself.

Is the evaporator that finned (ali?) heat exchanger you can see looking at the underbody near the cill?

 

[David Paul]

Thanks for the feed back - I am pleased I was able to help you using my own experience of a similar problem more years ago than I CARE to remember .

I think you misspelled the above word that is underlined.

The correct spelling is "CAN".



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[David Paul]

Thanks for the feed back - I am pleased I was able to help you using my own experience of a similar problem more years ago than I care to remember .

I think you actually meant, "than I am able to remember".



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[voxmagna]

The problem with our friends in the States is we have to understand their colloqialisms and different ways they spell their words. Now we see an expression which we Limeys, Poms and Derivatives thereof understand perfectly well along with many others:

https://www.google.com/search?num=1...as_qdr=all&as_occt=any&as_dt=i&as_sitesearch=

 

[Stripesmeow]

Hi Voxmagna, yes the a/c had to be degassed to get to the sensor. The labour cost was probably higher than it should have been as I'd got the mechanic to put the car back together unrepaired so I could drive home (waiting for the replacement sensor the next day).

I'm guessing that the "able to remember" / "can remember" is some joke about Silvershadow's possible failing memory... Nothing like a bit of good old semantics humour

 

[silvershadow]

.............................................

I'm guessing that the "able to remember" / "can remember" is some joke about Silvershadow's possible failing memory... Nothing like a bit of good old semantics humour

To set the record straight; "more than I care to remember" is an expression used by some of us entering the twilight of our lives and is intended to convey the fact we have reached senior citizen status .

As an early "baby boomer", I remember this expression often being used by my grandparents when I asked questions about their lives and experiences. Once as a child when I was impertinent enough to ask my paternal grandmother how old she was, the answer was "as old as my hair and a little older than my teeth which is more than I care to remember" [she grew up in the Victorian era when a woman's age was never discussed] .

Here endeth the lesson for the younger generations .

 

[voxmagna]

To set the record straight; "more than I care to remember" is an expression used by some of us entering the twilight of our lives and is intended to convey the fact we have reached senior citizen status .

These expressions are in our birth roots and create discussion on international websites. But then I find many Americanisms I sometimes have to Google for.

I am charting my own ageing process by becoming more aware of the number of typos I have to correct. But this is a good thing to keep an eye on. Sadly, I had a friend who passed away and his first symptoms of a brain problem were typing gibberish.

 

[David Paul]

These expressions are in our birth roots and create discussion on international websites. But then I find many Americanisms I sometimes have to Google for.

I am charting my own ageing process by becoming more aware of the number of typos I have to correct. But this is a good thing to keep an eye on. Sadly, I had a friend who passed away and his first symptoms of a brain problem were typing gibberish.

In my case, there are quite a few things I really don't care to think about due to the age thing.

However, unfortunately, due to the same age thing, there are a few situations I really can't remember.

Perhaps one of those "Can't Remember" situations is, what a brat I was when I was in my early teens. It is a wonder my mother didn't beat me within an inch of my life.

The Navy helped me grow up very quickly at age 17.

Oh wait, I actually do remember being a brat. I just don't care to think about it.

A lot of semantics here for sure.

Good grief, I forgot what the original subject was on this thread.

Oh yah, "No air coming out of vents". Certainly is a lot of hot air coming from some of the posters though.



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