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ScoobyDoo555
Barcelona


Joined: 26 Feb 2012
Posts: 1277



PostPosted: Sun Oct 08, 2017 10:05 am    Post subject: Bit of info required about the 996 fans...... Reply with quote

Hi All,

Noticed a couple of things recently that I need to get sorted. Car has been off the road for most of the Summer (!) whilst holidays and teaching my daughter to drive have taken over.

Some background first.
So I noticed 2 things:

1. AC not working - checked the front and it appears a condenser has failed (tell tale signs of leakage from a stone strike)

This has led to the system shutting down as all the gas has leaked out.
So, I've got a replacement and will refit today.(no legal issue as there is no gas 😂)
I can then get it pressure tested and refilled this week.

This may have affected my other issue -

2. noticed that the car (that has a LTT fitted, so should sit solidly on 80 degrees), crept up in standing traffic when I drove it last week. I noted that the driver's side fan hadn't kicked in.

Looking down, the ballast resistor looked like it had seen better days, so I've already soldered on a replacement working resistor.

But there's no change in temps nor high speed fan kicking in.

As plan b, I've got a spare fan assembly (whole thing) so I can change that too whilst the bumper is off and I'm changing the AC.

HOWEVER, my question is regarding the fans - will the temporarily "non-operational" AC affect my fans operation for say, cooling the car?

Will I need to get the system working to gain high speed fan operation?

Car isn't being driven at the moment, so time isn't an issue. Just want to get it sorted.

Thanks in advance,

Dan
_________________
Porsche 996 Carrera 4
Mods: "new car" magic tree. Pioneer F900bt, Alpine SPG10C2 x 4, JBL GTO 804 8" subs x 2, Shiny new rads & AC! Hartech-rebuilt engine & Sports exhaust
997 C2s discs. She stops quite nicely!
 
  
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MisterCorn
Zolder


Joined: 08 Jan 2011
Posts: 5291
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Sun Oct 08, 2017 10:09 am    Post subject: Reply with quote

The fans ran on mine at low speed when AC was not working. High speed operation is controlled by the ECU but I have never seen mine come on. Both fans should come on with AC. Easy to tell by listening or putting your hand over the air outlet.
The temperature on mine creaps up in traffic too, even with new radiators and two working fans.

MC
 
  
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ScoobyDoo555
Barcelona


Joined: 26 Feb 2012
Posts: 1277



PostPosted: Sun Oct 08, 2017 12:10 pm    Post subject: Reply with quote

Thanks buddy.

As confirmed - AC rads are fubar'd. The nearside one was worse than the offside - expected as the one is closer to the dirty side of the road.

I did them 4 years ago and they've been cleaned relatively regularly. TBH, there wasn't much crud due to the mesh I installed. (so nice to see that's worked well).

The whole thing is easy to do, but just not complete as I need to now order another condenser and o-rings.

Did panic when I heard a hissing sound as I undid the fubar'd condenser..... until I realised it was the cushion I was sat on!!!! Floor Floor Floor Floor Floor Floor


Still need to get to the bottom of this fan issue, as I simply don't recall it ever getting warm in traffic as the ac would be on. Hence my "awooga" now it's not working.

Dan
_________________
Porsche 996 Carrera 4
Mods: "new car" magic tree. Pioneer F900bt, Alpine SPG10C2 x 4, JBL GTO 804 8" subs x 2, Shiny new rads & AC! Hartech-rebuilt engine & Sports exhaust
997 C2s discs. She stops quite nicely!
 



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ScoobyDoo555
Barcelona


Joined: 26 Feb 2012
Posts: 1277



PostPosted: Sun Oct 08, 2017 12:10 pm    Post subject: Reply with quote

Here's the other side Very Happy
_________________
Porsche 996 Carrera 4
Mods: "new car" magic tree. Pioneer F900bt, Alpine SPG10C2 x 4, JBL GTO 804 8" subs x 2, Shiny new rads & AC! Hartech-rebuilt engine & Sports exhaust
997 C2s discs. She stops quite nicely!
 



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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 10987
Location: Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Oct 08, 2017 12:26 pm    Post subject: Reply with quote

You need to access the true temperature of what's going on here and not what your gauge is showing. Seeing as yours is a 3.4 Dan, you can interrogate the ECU live digital information on your climate control display. Turn it on to read the true water temp. Watch the level rise until the trigger point for enabling the fans is reached. Then see what your fans are doing. AS a quick check on the fan operation, I connect a 2v battery charger straight to the fan wires and see if it runs.

Read here to see how to read the live data:

http://911uk.com/viewtopic.php?t=81945
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2000 Manual 996 C4 Arctic Silver Convertible

 
  
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ScoobyDoo555
Barcelona


Joined: 26 Feb 2012
Posts: 1277



PostPosted: Sun Oct 08, 2017 12:42 pm    Post subject: Reply with quote

Cheers Alex,

I did recall there being a more accurate method of checking (had an Audi S4), but tbh, I want to get these bits on the car first (sort one problem at a time and see how it) - anything blatantly wrong needs correcting before diagnosing any other problems (especially if they may be related)

Will have a play with the panel when I get these parts sorted - got a bit of a deal with ECP this weekend - picking them up on Tuesday Thumb

Dan
_________________
Porsche 996 Carrera 4
Mods: "new car" magic tree. Pioneer F900bt, Alpine SPG10C2 x 4, JBL GTO 804 8" subs x 2, Shiny new rads & AC! Hartech-rebuilt engine & Sports exhaust
997 C2s discs. She stops quite nicely!
 
  
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3343
Location: Sussex


PostPosted: Sun Oct 08, 2017 6:02 pm    Post subject: Reply with quote

A/C on and even with no gass in the system the fans will still run at slow speed .

If one side is not working and you have changed the resistor then it could be a relay or the fan has died .

Need to get the coolant to 105 degrees for the fans to kick in on high speed ( seperate relay to the low speed ) as this will prove if its a fan or a wiring fault .

Ive read on here not long ago about someone changing his waterpump which had NOT failed and finding the temp was much lower .. sounds very similar to yours although it would appear you have x1 fan inop and that would affect it Smile
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ScoobyDoo555
Barcelona


Joined: 26 Feb 2012
Posts: 1277



PostPosted: Sun Oct 08, 2017 7:19 pm    Post subject: Reply with quote

Thanks Demort,

TBH, I was leaning towards the fan being borked anyway. As it turns out, I've got some other things to do as well now Very Happy

The fan does look like a bit of a pig to change, so thankfully I can try to do the ac rad change during the week, leaving the fan for the weekend (may as well change it as I've got the part).

Dan Thumb
_________________
Porsche 996 Carrera 4
Mods: "new car" magic tree. Pioneer F900bt, Alpine SPG10C2 x 4, JBL GTO 804 8" subs x 2, Shiny new rads & AC! Hartech-rebuilt engine & Sports exhaust
997 C2s discs. She stops quite nicely!
 
  
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maldren
Nürburgring


Joined: 07 Oct 2016
Posts: 430



PostPosted: Mon Oct 09, 2017 10:36 am    Post subject: Reply with quote

Fit some mesh over the air intakes to stop damage to your new condensers!
_________________
Mike
2003 996.2 C2 Coupe Arctic Silver
 
  
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crash7
Monza


Joined: 28 May 2011
Posts: 205



PostPosted: Mon Oct 09, 2017 11:00 am    Post subject: Reply with quote

Scobby,

Off-topic, you note at the foot of your posts your running 997 C2S brake discs? - Or have I miss read this?

If this is the case could you provide more detail please Thumb
 
  
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Yas.SYC4S
Trainee


Joined: 28 Nov 2016
Posts: 91



PostPosted: Mon Oct 09, 2017 11:37 am    Post subject: Reply with quote

I have a similar issue, Drivers side fan works High speed, passenger side fan seems to be on low speed (air con on max setting). Think it must be the relay. Which relay is it?? There are 5 relays under the foot well area.
_________________
Speed Yellow 996 C4S (EVO Magazine)
Guards Red Porsche 924 (1982)
Alfa Romeo 1750 GTV Mk1 (1968)
Laguna Seca Blue M3 E46
 
  
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3343
Location: Sussex


PostPosted: Mon Oct 09, 2017 8:20 pm    Post subject: Reply with quote

Yas.SYC4S wrote:
I have a similar issue, Drivers side fan works High speed, passenger side fan seems to be on low speed (air con on max setting). Think it must be the relay. Which relay is it?? There are 5 relays under the foot well area.


Relay board 1 above the fuse box , positions 20 and 22 .. not sure which side is which .
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Yas.SYC4S
Trainee


Joined: 28 Nov 2016
Posts: 91



PostPosted: Wed Oct 11, 2017 11:05 am    Post subject: Reply with quote

Thanks Demort! Will order my new relays.. easy fix!
_________________
Speed Yellow 996 C4S (EVO Magazine)
Guards Red Porsche 924 (1982)
Alfa Romeo 1750 GTV Mk1 (1968)
Laguna Seca Blue M3 E46
 
  
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Demort
Paul Ricard


Joined: 21 Mar 2015
Posts: 3343
Location: Sussex


PostPosted: Wed Oct 11, 2017 8:09 pm    Post subject: Reply with quote

Yas.SYC4S wrote:
Thanks Demort! Will order my new relays.. easy fix!


A quicker check would be to swop the relays , if the fault swops side to side then ok its a relay .. if not then its out with the meter and ill post a wiring diagram .. i like wiring faults Very Happy
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MisterCorn
Zolder


Joined: 08 Jan 2011
Posts: 5291
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Wed Oct 11, 2017 8:30 pm    Post subject: Reply with quote

Before going to the relays I would check for volts at the resistor. You can activate the high speed fans by heating up the engine bay sensor which sits in a slot in the top of the inlet manifold. When removed it can be a pig to put back until you find the right technique. When that is active you should have battery voltage on the fan side of the resistor. When only the AC is on you should have battery voltage on the other side of the resistor and a lower voltage at the fan.

MC
 
  
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ScoobyDoo555
Barcelona


Joined: 26 Feb 2012
Posts: 1277



PostPosted: Sun Oct 15, 2017 7:04 pm    Post subject: Reply with quote

MANY apologies - for some reason, my notifications for this thread weren't coming through.

Firstly, I do have mesh fitted Thumb - and it has worked VERY well indeed. I pretty much "fitted and forgot" about it.
When I looked at it last week to start this job, out of BOTH sides I managed to get about a half a handful of crud. That's it. Nothing more.

The one AC rad looks like a small stone strike - my mesh wasn't so small as to restrict air flow.
The other rad actually looks like a fatigue issue - go figure.

Yes, my front discs are of a 997 C2s - no real detail to say: I think they're pretty much a straight swap. Might be slightly different but not much.

Gotta get my system up first before going to relays - we'll see about that: good luck sorting it out.

Will post up more this week when life lets me hopefully get it finished Very Happy

Dan
_________________
Porsche 996 Carrera 4
Mods: "new car" magic tree. Pioneer F900bt, Alpine SPG10C2 x 4, JBL GTO 804 8" subs x 2, Shiny new rads & AC! Hartech-rebuilt engine & Sports exhaust
997 C2s discs. She stops quite nicely!
 
  
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