Temp guage - what is normal?

[derb]

Originally Posted by JFP in PA

What everyone is overlooking is that the factory gauge is notoriously inaccurate and non linear; attaching an OBD II scanner with real time data capture capabilities will show that when most gauges are centered around 180F, the engine is actually more like 205-210F, or higher……….so don’t place much faith in what it is telling you………

I agree, the dash gauge isn't much better than an idiot light. After I recently changed my coolant, I drove with the AC diagnostic set at the coolant temperature setting and was surprised how high the temperature actually is. My temperature varies from 92c to 108c (197F to 226F) and the dash gauge stays at the high side of the 1-8-0 numbers. There doesn't seem to be much correlation between temperature and driving style. However, stop and go traffic definitely increases temperatures. I looked at my radiators today and saw that they need to be cleaned. That might help lower the temp a little but these cars do run hotter than you think.
I'm also thinking about getting LN's thermostat.
Regards,
mike

[RandallNeighbour]

How does one set the AC unit to display diagnostic stuff?

Step by step instructions and be sure to tell me what it will display, please!

[derb]

Randall,
Click on this link...
http://mike.focke.googlepages.com/undocumentedacdiagnostics

[urban_legend]

So I guess, I will need the OBD II scanner. Any recommendations? My other car is a A6 twin turbo and frequently lights up the check engine light. So probably a decent investment.

BTW I am needing a new cluster anyway (the old KM and frozen cluster trick) seen elsewhere. Will be interesting to see if changing the cluster changes the temp and by how much.

[Steve Tinker]

I've just completed installing the LN low temp thermostat & coolant changeout last weekend. My temp guage is metric so I have /80 as opposed to /180 on the display.
Previously the indicator needle lay straight thro the 8, but with the new thermostat it now runs on the left hand side of the 8, slap bang on the / mark.
But the biggest advantage is that the needle stays in this position even when driving in heavy traffic wheras with the original, the needle quickly crept up past the 0 mark of the /80. This leads me to the conclusion that the t/stat is fully opened and is now flowing fluid to the full cooling capacities of the radiators.
As a side note, the old coolant (8 years old with 67,000km or 42,000 miles) was still clear, no scale visible & the inside of the t/stat housing and pipework was perfectly clean too. So maybe the Porsche "lifetime" coolant really is top shelf stuff.....

[Dave928]

[QUOTE:

I agree, the dash gauge isn't much better than an idiot light.

it isn't supposed to be. they made it non-linear around the operating temp so that the needle stays centered and owners don't keep going to the dealer with "my car's running hot/cold" or "the temp needle is always moving" when the temp is actually within the correct operating range.

most european cars are like this...

[JFP in PA]

Originally Posted by Dave928

[QUOTE:

I agree, the dash gauge isn't much better than an idiot light.

it isn't supposed to be. they made it non-linear around the operating temp so that the needle stays centered and owners don't keep going to the dealer with "my car's running hot/cold" or "the temp needle is always moving" when the temp is actually within the correct operating range.

most european cars are like this...

They actually ended up with a non-linear, inaccurate gauge because they got it from the lowest bidder...................

[jmatta]

Accountants won out over the engineers again, huh?

Why is this the recurring theme at Porsche...perhaps a management change will turn things around. I love my Porsches just as much as the next guy, but these cheap shortcuts really irritate me when few a pennies more, they could have sourced the proper component.

[urban_legend]

I have a hard time stomaching the "only buy Porsche parts" retoric when I see the quality of some of corners cut. When I replaced the dash speakers, I just laughed - Nokia brand cardboard speakers in a 45K convertible.

Forget the sound quality (it is nonexistent) - but paper in a convertible where it could easily get wet? Whoose idea was that?