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mrsimpson
Trainee


Joined: 07 Apr 2012
Posts: 91



PostPosted: Tue May 16, 2017 5:02 pm    Post subject: AC / Heater unit Reply with quote

I've had my car a few years now and I've got through a lot of fixes and niggles. But I've always put up with the AC not working. It blows hot air with an unpleasant burning smell when on, sometimes it's very very mildly cold, when I say cold don't imagine cold, just a slightly cooler heat than the heat already in the car...

So what's going to fix it? Is it a big job, expensive? A re-gas?

Anyone tackled this job in theirs?

Cheers

Darren
 
  
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 11800
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Tue May 16, 2017 8:18 pm    Post subject: Reply with quote

Does the compressor kick in to signify the 'AC' controls are working? If not there is not enough gas pressure in the system.

Firstly I'd take it for a re-gas to see if it has any leaks. Kwik-Fit (yes I know Rolling Eyes ) can do a re-gas and it's so easy a chimp could manage it with some training so it should be straigh forward as a long as you dont get the 'fitter' i had who opened the front trunk looking for the engine Floor

The process is automated (but tell them how much gas is needed as 964 might not feature on the system). If it has a leak - no charge. If it works and then fails (due to a small leak) full refund. Thumb So at this point you have spent nil.

If there is a leak you then need an AC specialist unless you can see the dye coming out anywhere to trace the leak. If it's not a pipe then start with the condensor (c£90), drier (c£40) and then evaporator (c£80) with expansion valve (c£40). The first two parts you could do yourself, the evaporator is a 10hr job and involves a lot of parts to be removed - not complex but not for the faint hearted. My Indy did it for me and you ideally need to find one that has done it before.

I've done the condensor, drier, expansion valve and then had to commit to having the evaporator replaced what That said it now works a treat Grin

A good DIY thread here to show you what you could be in for: http://p-car.com/diy/ac/

My evaporator looked as bad as in those pics!
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Me? The 13th Duke of Wybourne? Here? In a sixth form girl's dormitory? At three o'clock in the morning? With my reputation? What were they thinking of?
 
  
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maldren
Nürburgring


Joined: 07 Oct 2016
Posts: 470



PostPosted: Wed May 17, 2017 7:28 am    Post subject: Re: AC / Heater unit Reply with quote

mrsimpson wrote:
I've had my car a few years now and I've got through a lot of fixes and niggles. But I've always put up with the AC not working. It blows hot air with an unpleasant burning smell when on, sometimes it's very very mildly cold, when I say cold don't imagine cold, just a slightly cooler heat than the heat already in the car...

So what's going to fix it? Is it a big job, expensive? A re-gas?

Anyone tackled this job in theirs?

Cheers

Darren


Do you get the unpleasant burning smell with the heater but no aircon? The heater motor is easy to change and cheap if you buy from ECP - the Porsche part I took off was Valeo and this is a very expensive part from Porsche. ECP do a Valeo part for about £80 and a cheaper alternative, I initially bought the cheaper p[art but it rotated the wrong way and didn't work!!!
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Mike
2003 996.2 C2 Coupe Arctic Silver
 
  
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mrsimpson
Trainee


Joined: 07 Apr 2012
Posts: 91



PostPosted: Thu May 18, 2017 4:15 pm    Post subject: Reply with quote

Thank you both so much, I'll look into those options.
 
  
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Zingari
Donnington
Donnington


Joined: 25 Oct 2009
Posts: 11800
Location: Cheshire

1993 Porsche 964 Anniversary

PostPosted: Thu May 18, 2017 5:47 pm    Post subject: Re: AC / Heater unit Reply with quote

maldren wrote:

Do you get the unpleasant burning smell with the heater but no aircon? The heater motor is easy to change and cheap if you buy from ECP - the Porsche part I took off was Valeo and this is a very expensive part from Porsche. ECP do a Valeo part for about £80 and a cheaper alternative, I initially bought the cheaper p[art but it rotated the wrong way and didn't work!!!


Are you sure this was for a 964 as the heating comes off the heat exchanger direct from the engine and is 'assisted' through the car by a series of fans Dont know
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