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heed
Newbie


Joined: 24 Jan 2019
Posts: 34



PostPosted: Thu Apr 18, 2019 4:52 pm    Post subject: Reply with quote

I have a general question about the AC. I guess this is as good a place to ask it....

What temperature should the air be (at the vents) when it's on low? I realise that a 996 isn't going to be as great at chilling the car as a more modern vehicle, but my AC doesn't seem that cold.

I could measure the temp with a meat thermometer in the vent, but I don't know what to expect as a reasonable temperature.
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maldren
Suzuka


Joined: 07 Oct 2016
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PostPosted: Thu Apr 18, 2019 5:59 pm    Post subject: Reply with quote

Mine feels pretty cold, if it doesn't you may need a re-gas?
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Mike
2003 996.2 C2 Coupe Arctic Silver
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6477
Location: Brighton


PostPosted: Thu Apr 18, 2019 7:19 pm    Post subject: Reply with quote

heed wrote:
I have a general question about the AC. I guess this is as good a place to ask it....

What temperature should the air be (at the vents) when it's on low? I realise that a 996 isn't going to be as great at chilling the car as a more modern vehicle, but my AC doesn't seem that cold.

I could measure the temp with a meat thermometer in the vent, but I don't know what to expect as a reasonable temperature.


You would be looking in the region of 6 degrees Celsius .

Rule of thumb .. measure with a/c off and on low setting then the same with a/c on ...

Compare the difference between the 2 .
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deMort
Long Beach


Joined: 21 Mar 2015
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PostPosted: Mon Apr 22, 2019 8:04 pm    Post subject: Reply with quote

maldren wrote:
Mine feels pretty cold, if it doesn't you may need a re-gas?


yup.
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heed
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Joined: 24 Jan 2019
Posts: 34



PostPosted: Wed Apr 24, 2019 8:17 pm    Post subject: Reply with quote

So, the plot thickens....

This is current situation:

LO, max power, no AC (no frost flake), running engine (car warm) temp is ~19C.

Same settings but press the snow flake: temp stays the same. No change at all - 19C.

No noise at all when pressing snowflake, though the AC condensers do come on at front of car.

OK, so I go to Halfords for a "free check"; I just wanted to see if there was anything in the system. Chap has one of those cans with the PSI gauge on it. Not a good start. Anyway, he puts it on and the pressure is low/none existent.

So I'm thinking leak or it never got refreshed after some work...

I explain it needs 900g along with the correct oil but he's like "er this is PSI and has coloured regions on the dial". We figure it's worth putting some in to see if it holds. At least I'll know if there is a gaping leak anywhere.

So he fills it so it's in the green zone. I believe somewhere between 25-40 PSI . (it was about 17C today).

With the car running and AC on the pressure seems to hold in that zone but still no AC.... Temp at vents doesn't change...

He doesn't charge me (I should hope not!) and I ***** off.

On drive back when I have the AC on it now produces a very strange noise...

https://youtu.be/ylLLgnCUfow

It's coming from very near the refill valves and battery in the frunk. It comes on when AC is activated and stops when AC turned off. The fan speed does not affect the noise.

This is the history:


    - 2012 AC condensers replaced
    - 2018 TVR101 did an AC service. I rang them today and they confirmed that they drained and refilled system. No problems


What should be my next steps?


    - What's that noise!? Is it because there is a non-zero but not enough amount of gas in the system?
    - I have an Autel 805. It has a lot of 996 info. Is there anything I can check that would help identify an issue? It has live reporting too if there is a test I could do with the AC on/off?
    - Should I take it to somewhere with a proper machine and get it gassed?
    - Should I just wait a week and take it to see if all the gas has gone?
    - Should I check the compressor?


The fact there is no gas says to me that there was a leak, but that doesn't explain why the system didn't work when it was gassed and under pressure?
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deMort
Long Beach


Joined: 21 Mar 2015
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PostPosted: Wed Apr 24, 2019 8:52 pm    Post subject: Reply with quote

I listened to about 5 seconds of that video .. its low a/c gass basically .

Regassing via pressure gauges is pretty old school .. its that old i've never learnt it !

the car needs to have 900 grams of gas put in the system .. modern machines do a leak check .. if that fails then there is an obvious leak but it won't detect a small leak.

In other words you regas a system and it makes that noise or stops working in 3 months .. that's a slow leak .

You can have other faults ..

IE .. if the car sees the interior temp as 10 degrees .. faulty sensor then it will shut down the a/c as it thinks the car is already cold .. it may even start blowing hot air to get to then temp you have selected .. say 18 .

For me and the first thing is to make sure you have the correct amount of gas in the system ... so get it regassed and go from there .
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Eldavo
Monza


Joined: 21 Aug 2013
Posts: 239
Location: Newcastle upon Tyne


PostPosted: Mon Apr 29, 2019 6:46 pm    Post subject: Reply with quote

To add to this thread, I have a slight clicking noise coming from under the passenger side of the dash that changes with the speed of the fan setting on the climate control.

I think it could be the fan under the pollen filter, I’m going to take a look and see if something is catching but wondered if there was something common I’m missing first?
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6477
Location: Brighton


PostPosted: Mon Apr 29, 2019 6:56 pm    Post subject: Reply with quote

pop the pollen filter out and have a look at the fan for leaves .. nuts .. mice debris .. i've seen various things in there before thanks to our furry friends .

Spin the fan by hand .

This on a 997 / 987 would be a flap motor sticking and not reaching its end stop .
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Eldavo
Monza


Joined: 21 Aug 2013
Posts: 239
Location: Newcastle upon Tyne


PostPosted: Mon Apr 29, 2019 8:42 pm    Post subject: Reply with quote

Will check it out tomorrow and report back, thanks.
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Eldavo
Monza


Joined: 21 Aug 2013
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PostPosted: Tue Apr 30, 2019 5:07 pm    Post subject: Reply with quote

A thin section of the insulation on the recirc flap had come off and was catching on the fan - now removed and normal service resumed. Thumb
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6477
Location: Brighton


PostPosted: Tue Apr 30, 2019 7:19 pm    Post subject: Reply with quote

Eldavo wrote:
A thin section of the insulation on the recirc flap had come off and was catching on the fan - now removed and normal service resumed. Thumb


I think that would fall under " various things in there " lol

Sorted Very Happy
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heed
Newbie


Joined: 24 Jan 2019
Posts: 34



PostPosted: Fri May 10, 2019 7:31 am    Post subject: Reply with quote

deMort wrote:
I listened to about 5 seconds of that video .. its low a/c gass basically .

Regassing via pressure gauges is pretty old school .. its that old i've never learnt it !


You were right. Pro Tyre had a machine available whilst getting an alignment done so I asked them to try. It worked. I now have AC.

Only downside - because it took 900g (I think it was almost that anyway as system pretty empty), they charged me double! So £120, but I don’t care as I have AC Thumb
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deMort
Long Beach


Joined: 21 Mar 2015
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Location: Brighton


PostPosted: Fri May 10, 2019 7:20 pm    Post subject: Reply with quote

To be fair that's not a huge cost .. the gas isn't cheap and that's a Full regas .

To loose the gas though its either a slow leak over many years or a problem with a/c condenser being top of the list .

Sorry but i didn't read all the posts again so i might have covered this .
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JTT
Trainee


Joined: 11 Nov 2015
Posts: 82
Location: Halifax, NS Canada


PostPosted: Tue May 14, 2019 12:37 am    Post subject: Reply with quote

Hi deMort,

So, I have this odd whirring sound that goes away when AC is shut off. I have looked all along the lines and fittings and see no leaks. AC still blows cold, just makes this annoying sound.

Am I able to simply have my mechanic re-gas it? Your suggestion that these systems loose some naturally without leaks makes sense (nothing is 100% tight) and car is now 16 yrs old, so makes sense it is down. But, it is legal to re-gas without fixing "something"?
 
  
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heed
Newbie


Joined: 24 Jan 2019
Posts: 34



PostPosted: Tue May 14, 2019 8:29 am    Post subject: Reply with quote

JTT - does it sound like the video I posted earlier in the thread?

That was low gas in the end. Re-gas sorted it.
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JTT
Trainee


Joined: 11 Nov 2015
Posts: 82
Location: Halifax, NS Canada


PostPosted: Tue May 14, 2019 9:25 am    Post subject: Reply with quote

Yes, whirring sound, like a bad bearing. "Seems" to vary slightly with engine RPM, but definitely stops when AC is turned off, and restarts shortly after turning AC back on.
 
  
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maldren
Suzuka


Joined: 07 Oct 2016
Posts: 1064



PostPosted: Tue May 14, 2019 9:43 am    Post subject: Reply with quote

JTT wrote:
But, it is legal to re-gas without fixing "something"?


Yes, this is core business for most AC garages, they empty remaining gas and top up gas and (if required) oil.
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Mike
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