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iceboy
Nürburgring


Joined: 18 Apr 2013
Posts: 375
Location: Berkshire


PostPosted: Mon Apr 22, 2019 8:29 am    Post subject: 996.1 C2 - water temperature Reply with quote

Hi All,

With my water temperature gauge being temperamental, I've been using the hack on the ac unit to read the temperature of the water.

On a normal motorway run the car reads 94 and around town it reads 100 and when stuck in traffic it reads 106 and the fans kick in.

Is this normal... Seems high to me??

Iceboy
_________________
Current cars:
996 Turbo S - Coupe/Manual
996.1 Carrera 2 - Couple/Manual
Mercedes S320 CDI - Every day car
BMW 320d M-Sport Plus - Mrs. Ice
VW Golf GTI 8v Big bumper - Summer Toy
 
  
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7308
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Mon Apr 22, 2019 8:45 am    Post subject: Reply with quote

That is about what I see on my C2. It does creep up when not moving. Mine has fresh radiators and coolant.

MC
 
  
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iceboy
Nürburgring


Joined: 18 Apr 2013
Posts: 375
Location: Berkshire


PostPosted: Mon Apr 22, 2019 8:46 am    Post subject: Reply with quote

Thanks MC.

Just wanted to be sure.

Iceboy
_________________
Current cars:
996 Turbo S - Coupe/Manual
996.1 Carrera 2 - Couple/Manual
Mercedes S320 CDI - Every day car
BMW 320d M-Sport Plus - Mrs. Ice
VW Golf GTI 8v Big bumper - Summer Toy
 
  
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skinny_monkey
Nürburgring


Joined: 16 Sep 2014
Posts: 464



PostPosted: Tue Apr 23, 2019 9:46 pm    Post subject: Reply with quote

It's a little high for cruise - from memory the standard thermostat is 85 ish.

If 70 mph air and gentle cruise throttle (i.e the best conditions for cooling) can't get you down to this temperature then check your rads are not blocked, your coolant is in good condition / at the right level, and if your water pump has ever been changed.

It does go high sat in traffic as you are just relying on the fans to pull air through the rad and the engine speed is low so the water has a lot of time to pick up lots of heat. The high speed fans kick in at a ridiculously high temperature. Something like 105 deg C. And then turns off at maybe 102 deg C.

I normally run with A/C but always if I'm heading into traffic as it automatically turns fans on to low speed, which does help to slow or even stop your temps getting high in the first place. But even if they have gone up in traffic, 5 mins at a constant 70mph even at high ambient brings my temps back to stable at thermostat opening temp.

My cooling system had a bit of a workout in M3 /M27 traffic this bank holiday weekend. I used to get a squeaky bum in the past with my temp gauge but after fixing the blown resistors the a/c trick works great and keeps me below 90 pretty much all the time. And i start from a slightly cooler temp than normal as i have a low temp stat fitted.
 
  
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Stotty
Monza


Joined: 17 Dec 2009
Posts: 164
Location: Surrey


PostPosted: Wed Apr 24, 2019 10:47 am    Post subject: Reply with quote

Like Skinny, I have my AC on all the time as it runs the fans at a lower temp.
_________________
2000 996, C2, manual, arctic/metropole, Koni shocks, H&R -30 springs, H&R ARB's, Rennline SS engine mounts, cup wheel, 170k miles. 2018 Touareg RLine Plus
 
  
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iceboy
Nürburgring


Joined: 18 Apr 2013
Posts: 375
Location: Berkshire


PostPosted: Wed Apr 24, 2019 6:21 pm    Post subject: Reply with quote

It seems that I might have a little issue.

I will look it to this.... Ive not been using the AC as it needs a new pipe and gassing.

Iceboy
_________________
Current cars:
996 Turbo S - Coupe/Manual
996.1 Carrera 2 - Couple/Manual
Mercedes S320 CDI - Every day car
BMW 320d M-Sport Plus - Mrs. Ice
VW Golf GTI 8v Big bumper - Summer Toy
 
  
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1284
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Wed Apr 24, 2019 7:05 pm    Post subject: Reply with quote

Mine runs around 88-90 odd off the a/c secret menu, I'm clearly not working it that hard?
_________________
1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
 
  
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2992
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Wed Apr 24, 2019 11:53 pm    Post subject: Reply with quote

Having read this thread I put the ‘hack’ on today as I’d some serious about town driving to do. About an hour of stop start traffic in all.
I left the AC on, and found the temp peaked at 84C, even when sitting idle for over twenty minutes at one stage.
Once on the open road again it dropped to and stayed at 79C.

For comparison I’ve recently had a lower temp thermo, new rads and resistors, new coolant tank fitted, and a coolant flush.
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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Stotty
Monza


Joined: 17 Dec 2009
Posts: 164
Location: Surrey


PostPosted: Thu Apr 25, 2019 7:51 am    Post subject: Reply with quote

iceboy wrote:
It seems that I might have a little issue.

I will look it to this.... Ive not been using the AC as it needs a new pipe and gassing.

Iceboy


Even if your AC is not working you can leave it switched on and the fans will run... ran mine like that for 6 years until I bit the bullet and had the AC fixed last month.
_________________
2000 996, C2, manual, arctic/metropole, Koni shocks, H&R -30 springs, H&R ARB's, Rennline SS engine mounts, cup wheel, 170k miles. 2018 Touareg RLine Plus
 
  
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Jamesx19
Nürburgring


Joined: 10 Jul 2015
Posts: 476
Location: Brighton


PostPosted: Thu Apr 25, 2019 12:12 pm    Post subject: Reply with quote

Before worrying too much, the posts seem to me in indicate a variation in "normal" temps seen by different cars.

Once saw a YouTube vid were the owner was concerned about oil pressure and connected his pressure switch to another cars guage and visa versa. Turned out to be the sender was faulty.

Maybe try a new temp sender first before anything more tricky and expensive? It's on the side of the water manifold near the rear engine carrier. Opposite side to the thermostat housing. Shouldn't lose too much water if you swap them quickly. Just a thought anyway.

Good luck.
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2992
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Mon Apr 29, 2019 7:45 pm    Post subject: Reply with quote

Just a quick note to second advice to use AC .. I’ve done about 500 miles in my 996 in the last week, most motorway but some in heavy city traffic.
Once going steadily at 40mph or faster my temp readout stayed at 77 to 78C with or without AC fans on.
In stop start traffic, AC off, the temp quickly climbs into the mid/late 90’s, but staunching AC on brings the engine temp back down.
Leaving AC on BEFORE hitting traffic keeps my engine at 84C max while crawling along, however lengthy the delay ..
Hope this helps.
_________________
'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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