Porsche Enthusiasts Club Forum

Sometimes can take 5 or 6 hot cold cycles to clear the persistent air in the system. Funnily enough every classic I've had has been a pain for this, the TR7 was worse!

I was going to fit a QH stat, but compared it to the stat already fitted to my 944t. When I took them in the kitchen (without the wife's knowledge!), and put them both in the same large cup filled with freshly boiled water from the kettle, the old one opened much quicker and stayed open longer. If the water had just to say gone off the boil, then the old one would open but the new one (QH) wouldn't. When I looked closer, the old one had 82 written at the edge, and if memory serves - 85 or 87 on the new one. I would reasonably guess that those numbers represented the operating / opening temperature of each of the stats. I put the old stat back in - I would rather a stat opened sooner rather than later.

This might help

Cheers

Mark

Interesting. I remembered I have an old New stat that was given to me by a guy who used to run a 944. Just got it out & it has 83 written on it. Along with made in Germany. Think I might give that one a whirl. Have a feeling the engines coming to bits completely anyway.

I checked in the stat I installed (QH) and it was stamped 80. It now seems much better and steady at half way on my dial so I'm assuming that my constant bleeding over the last few days has finally removed any trapped air.
Thanks to all

Talked to JMG today about this. The story is that the 83 degree thermostats were discontinued. 87 degrees is the right stat for a 968. Since the 83 ones were no longer available Porsche started supplying 87 ones. Not a big difference & over time the spring softens itself but that would explain why mine was running at three quarters on the gauge while on the dyno. It's no detriment to the engine but the gauge is obviously fairly sensitive. So if QH are doing 80 degree ones that would be better??? How recently did you buy it?

My mate the mechanic doesn't like the 87 stat. Going to put the 83 one in. Trouble is that the fan is constantly coming on to pull the temp down to 83 & the stat is fighting it! Not really a good idea. So playing safe. Would like to know if the QH stats are 80 or 87? Or if anybody else has found a souce of cooler thermostats for the 944. Swapping my old camshaft back at the same time.

Hi JJ

I have had two QH stats recently, both stamped 80. I am not convinced the current one is opening fully at 80 though. I am convinced it is only partially opening and that is the reason I changed to the 2nd one as it suddenly started running a bit hotter than it had done previously.

I have bought one from Porsche this week and it is an 83 degree one made by Wahler (German). I am going to take out the QH one and pop it in a kettle with the Porsche one and see what happens.

It might be that the spring just has to free off, who knows! So I might just leave it a few weeks and monitor the situation. I think I have covered the last 1,000 miles looking mostly at my temp gauge with an occasional glimpse to the road!

Stuart

Out of curiosity I changed my temp gauge last week rather than change the stat for a 2nd time.

Temp has been spot on since. With the 80 degree stat it sits just above the first white line under normal driving conditions. It will rise to half way if stuck in traffic then go back where it was once you get going again.

Either a coincidence or the old gauge was faulty. Incidentally I had to flick the dashboard with the old gauge to kick start it, should maybe have thought about changing the gauge a bit sooner!

Oh well, fingers crossed!

Stuart

Thanks for that. Gauges are a bit flaky. 80 degree stats sound a better idea than reusing the original. Maybe some old stock 83 ones left at Porsche??

I bought one from Glasgow Porsche last week and it was an 83 degree one. They had to order it in so not old stock.

Def still available.

It's still lying on my living room table!

Stuart

I've swopped my temp gauge for the same reason. I have been told that I need to leave the battery disconnected for at least a couple of hours to prevent any ecu issues - I have an on going ABS problem that the garage insist leaves the ABS working (although I haven't managed to trigger it and I was trying) but the lights on the dash permanently.
I have been told that my messing with the gauges and reconnecting the battery when I have finished could have "confused" the ECU for the ABS.

I'm not sure I'm buying it personally. I think the ABS ecu needs changing.
Any thoughts?

Hi DavidL - from my limited experience this sounds unlikely to me. Given I have had 6 months of renovating a 2.7 944 laid up for 5 years and countless disconnect/reconnect the ECU/ABS ECU/Fusebox etc etc - never had any problem with 'ECUs getting confused'..... just my 2 cents....
Ian

Hi David

I have to agree with the doctor. Pretty sure your ABS will be inoperative with the light on.

Do you hear the pump whir when you start to move off?

Stuart

The ABS ECU will not be 'confused', its a simple system & does not need to be reset. If the light is on the dash whilst driving the system is disabled, you should be able to lock the wheels under heavy braking. The ECU is a common culprit (I think Promax even keep a few in stock now).

I'm glad it isn't just me that thinks it all sounds a bit far fetched.
I've picked up a spare ECU from ebay - is it just plug and play?