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Running VERY hot at Idle
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Finn99  



Joined: 27 Jan 2010
Posts: 26
Location: Vancouver, BC

PostPosted: Wed Jul 21, 2010 6:49 am    Post subject: Running VERY hot at Idle Reply with quote

hey guys....not sure if I should post this here or in another part of the forum but here goes.......I've just replaced my water pump but my temperature gauge is going all the way to the limit after about 5-10 min of running at idle....I took it out for a drive and about 5 minutes in, it did the same....any ideas on what the issue might be?

It's a normally aspirated 1977.5.

cheers,
Juha
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datatrain  



Joined: 15 Sep 2007
Posts: 441
Location: Osoyoos, British Columbia

PostPosted: Wed Jul 21, 2010 6:52 am    Post subject: Reply with quote

Is your thermostat stuck in the closed position. Is the belt tight on the pump. Did you bleed the system after you refilled the radiator ?
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'78 924 NA with Collector plate
33 year old car, with me for 21 yrs
Mint '92 318i BMW
Near mint '98 Buick LeSabre
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CorsePerVita  



Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon

PostPosted: Wed Jul 21, 2010 7:01 am    Post subject: Reply with quote

+1 to datatrain. Make sure no bubbles in the system and everything else. Old worn out thermostat will start getting stuck or not open.

You can drop the thermostat in some almost/not-quite/on-it'swaytoboiling water and see if it GRADUALLY opens. If it doesn't, your thermostat isn't opening.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS
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Finn99  



Joined: 27 Jan 2010
Posts: 26
Location: Vancouver, BC

PostPosted: Wed Jul 21, 2010 7:26 am    Post subject: Reply with quote

thanks for the quick responses...I'll try these tips asap and report back when done...I wonder if this has anything to do with my 'hot start' problem?!? The car starts on the first turn every time when it's nice and cool but requires some effort after running for awhile....
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Smoothie  



Joined: 01 Jan 2003
Posts: 8030
Location: DE (the one near MD, PA, NJ)

PostPosted: Wed Jul 21, 2010 8:00 am    Post subject: Reply with quote

+ make sure the rad fan/s are running.
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11374
Location: PacNW

PostPosted: Wed Jul 21, 2010 8:07 am    Post subject: Reply with quote

Smoothie wrote:
+ make sure the rad fan/s are running.


. . .first.
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  • Shaggy (1980 931) - Got Boost?
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Finn99  



Joined: 27 Jan 2010
Posts: 26
Location: Vancouver, BC

PostPosted: Wed Jul 21, 2010 8:12 am    Post subject: Reply with quote

will do...these are great suggestions and inline with my thinking....it's strange that it just started happening....got the water pump replaced, put maybe 100 miles on it in the coming weeks...then it sat for 2 or so weeks while I was away and all of a sudden, I turned it over, let it run and you could see the guage go into the red....
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Slam  



Joined: 07 Jan 2005
Posts: 1689
Location: Wainwright, Alberta, Canada

PostPosted: Wed Jul 21, 2010 10:40 am    Post subject: Reply with quote

Did you make sure to fill the block before popping the thermostat in? You'll never get enough coolant into the system just by filling the overflow tank with a cold engine and closed thermostat.

And check out the points stated above.

Also, a very lean mixture leads to overheating, too.
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'84 944 - all-weather workhorse.
'83 944 - still looks like ass.
'87 944 - wifey's DD, alive and well.
'80 924 - tuned by son #1.
'78 924 - blown up by Scottie.
'77 924 - gift from friend. Future project...
Some wrecks
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Finn99  



Joined: 27 Jan 2010
Posts: 26
Location: Vancouver, BC

PostPosted: Thu Jul 22, 2010 2:16 am    Post subject: Reply with quote

thanks for the advice....it's greatly appreciated. The Water Pump was professionally installed so I hope they did all the usual necessary things.

the battle continues....I will hopefully get to it this week.
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ideola  



Joined: 01 Oct 2004
Posts: 15421
Location: Woodstock IL

PostPosted: Thu Jul 22, 2010 2:28 am    Post subject: Reply with quote

Finn99 wrote:
I hope they did all the usual necessary things.

I would assume NOTHING, regardless of how reputable the shop may be. You need to verify ALL assumptions, including the t-stat installation.
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88 924S SE | 82 931 Holbert | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition
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Finn99  



Joined: 27 Jan 2010
Posts: 26
Location: Vancouver, BC

PostPosted: Thu Jul 22, 2010 2:36 am    Post subject: Reply with quote

very true indeed. Especially with these cars. I'll go through a check list of items to trouble shoot based on all the good advice and see how we do...
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Finn99  



Joined: 27 Jan 2010
Posts: 26
Location: Vancouver, BC

PostPosted: Tue Aug 17, 2010 2:24 pm    Post subject: Reply with quote

finally got to work on this issue while the wife and baby were away....after going down various routes of trouble shooting, it turns out that the thermometer was only partially working after doing the water heating tests.....new thermometer it is!

thanks for the help guys!
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Joes924Racer  



Joined: 03 Nov 2002
Posts: 11960
Location: Oregon, Denver Colorado native!

PostPosted: Tue Aug 17, 2010 2:42 pm    Post subject: Reply with quote

Thats what were here for.. we stand buy our cars & help guys
like you out.
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1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.
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ideola  



Joined: 01 Oct 2004
Posts: 15421
Location: Woodstock IL

PostPosted: Tue Aug 17, 2010 9:05 pm    Post subject: Reply with quote

Congrats on challenging the assumptions and finding the problem!
_________________
88 924S SE | 82 931 Holbert | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition
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Finn99  



Joined: 27 Jan 2010
Posts: 26
Location: Vancouver, BC

PostPosted: Wed Aug 18, 2010 1:33 am    Post subject: Reply with quote

it was actually fun getting to wrench for a bit.....I appreciate all the help once again! I'm sure I'll find something else to get answers for!
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