Discussion
With all the chatter about inspections and potential headaches, it's good to be reminded that these are just cars!
Took my Targa out yesterday and it developed a nasty engine speed related clatter/squeal. Wasn't far from home so got it back with no fuss.
Popped the lid today and removed the air box. Signs of damage to the belt so took it off and checked each pulley, found loads of play on the water pump shaft. Everything else as it should be so popped airbox back on and ran it without belt for a moment, all noise gone.
So to diagnose that took two sockets, a screwdriver and about ten minutes.
A bit of research suggests it'll take about two hours of my time to swap it out from underneath and no more than £200 for a new pump, gasket, thermostat and belt.
Try that in a run of the mill daily driver and you'll be playing with cam belts and other nasties!
Took my Targa out yesterday and it developed a nasty engine speed related clatter/squeal. Wasn't far from home so got it back with no fuss.
Popped the lid today and removed the air box. Signs of damage to the belt so took it off and checked each pulley, found loads of play on the water pump shaft. Everything else as it should be so popped airbox back on and ran it without belt for a moment, all noise gone.
So to diagnose that took two sockets, a screwdriver and about ten minutes.
A bit of research suggests it'll take about two hours of my time to swap it out from underneath and no more than £200 for a new pump, gasket, thermostat and belt.
Try that in a run of the mill daily driver and you'll be playing with cam belts and other nasties!
And a prefect morning for a blast! Looks well, its been fun following your story and glad you got there in the end.
Mine not out to play today. Decided water pump not thrilling enough so combining the job with coolant flush and new exhaust boxes. My new best friend is a Dremel with a cutting disc! Nuts!
Mine not out to play today. Decided water pump not thrilling enough so combining the job with coolant flush and new exhaust boxes. My new best friend is a Dremel with a cutting disc! Nuts!
Edited by LFB531 on Sunday 9th October 09:59
Dammit said:
My 996 really does not enjoy stop start traffic (such as you find trying to get in or out of London), the temperature gauge goes from 85ish to close to 100- should I be worried by temps of 100?
I don't like seeing the temp get so far from its normal position.
Sounds like the low speed cooling fan resistors have failed - they are in a grotty position and frequently do this. What then happens is that the temp rises to the stage 2 fan threshold (direct connection, rather than in series with a resistor) and you'll hear them roaring at full speed. A quick test is to put the a/c on, you should hear the fans running at a gentle (quiet) speed at the front of the car..I don't like seeing the temp get so far from its normal position.
bgunn said:
Sounds like the low speed cooling fan resistors have failed - they are in a grotty position and frequently do this. What then happens is that the temp rises to the stage 2 fan threshold (direct connection, rather than in series with a resistor) and you'll hear them roaring at full speed. A quick test is to put the a/c on, you should hear the fans running at a gentle (quiet) speed at the front of the car..
Is this something that I could fix? It fits the observed symptoms exacty.Yup, as cmoose says you need to replace the resistors. Porsche do do a kit that has a new resistor and wiring loom and you splice it in, it's fairly expensive for what it is, but if you want foolproof (i.e. the right resistor value and rating) then that's it.
http://www.design911.co.uk/fu/prod11158/Series-Res...
http://www.design911.co.uk/fu/prod11158/Series-Res...
I emailed the Indy garage about this, their response:
"What you have said, seems to be normal. Normal running temp is 80-90. The fans cut in at low speed stage 1 which you cannot hear inside the car. If your in traffic you will hear the 2nd stage to drop the temp back down to 80 ish.
Darren did not report the resistor not working. If you would like us to recheck then please let me know."
It's a little difficult to tell given the lack of graduations but I'd say the gauge shows a temp of over 90 - just below 100.
Is there a way that I can test the resistor without having to run the car down to Precision? They're an hour and a halfs drive, so I'd rather test myself if I can.
If this is normal then I'll stop worrying about it!
"What you have said, seems to be normal. Normal running temp is 80-90. The fans cut in at low speed stage 1 which you cannot hear inside the car. If your in traffic you will hear the 2nd stage to drop the temp back down to 80 ish.
Darren did not report the resistor not working. If you would like us to recheck then please let me know."
It's a little difficult to tell given the lack of graduations but I'd say the gauge shows a temp of over 90 - just below 100.
Is there a way that I can test the resistor without having to run the car down to Precision? They're an hour and a halfs drive, so I'd rather test myself if I can.
If this is normal then I'll stop worrying about it!
Listen to the front of the car, you should hear the stage one fans (on both sides) run when the temp gets to the top of the 80 graduation (ish) on the gauge. The temp should then fall down, and never get to the 100 point, at which you'll hear the fans at very high speed.
Easiest way to test is to disable the AC by pressing the * button, and the fans should stop. Then whilst the engine is idling, press it to enable the AC, you should hear the compressor click from the engine bay, the idle will increase slightly, and then you'll hear the fans start slowly. If the slow speed is not working, what will happen is you'll hear the fans start every 30 seconds or so and then stop as the high pressure switch for the AC cuts in due to there being no cooling for the condensers, and the pressure going too high.
Easiest way to test is to disable the AC by pressing the * button, and the fans should stop. Then whilst the engine is idling, press it to enable the AC, you should hear the compressor click from the engine bay, the idle will increase slightly, and then you'll hear the fans start slowly. If the slow speed is not working, what will happen is you'll hear the fans start every 30 seconds or so and then stop as the high pressure switch for the AC cuts in due to there being no cooling for the condensers, and the pressure going too high.
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