Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 928 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
cmcgee's Avatar
 
Join Date: Nov 2005
Location: Vermont
Posts: 33
928 S4 Engine Temps

My 1991 928S4 tends to run at or just below the hash mark between the 170 mark and the 210 mark (red area) which should represent 190 on the engine temp gauge. The electric fans are working and kick on at the 190 mark to bring the temp down to around 180. It has never gone beyond the 190 mark and has never overheated. Is this a normal operating temp for these cars?
Thanks. Chris
__________________
Chris McGee
2003 996 TT (X50 PCCB Aero)
1991 928 S4 (stock)
1986 911 Carrera (bad-ass)
2014 Cayenne Platinum (daily driver)
Old 03-18-2009, 06:51 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Moderator
 
MPDano's Avatar
 
Join Date: Dec 2007
Location: Sunny San Diego
Posts: 9,024
Garage
Are you checking the obvious (coolant level)? When was the last time you replaced your Thermostat? Are your fans kicking in at all? Not really familiar with the S4, but they have a belt driven fan/clutch set up? If so, when cold does spinning the fan give resistance?
__________________
1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior
1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
Old 03-18-2009, 06:55 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
cmcgee's Avatar
 
Join Date: Nov 2005
Location: Vermont
Posts: 33
928 Engine temps

Yes, my fans are working properly as I stated around 190. Coolant levels are fine. Don't know when thermostat was last changed since I've only owned the car for a little over a year. My question is...is this running temp of 180-190 in the normal range?
__________________
Chris McGee
2003 996 TT (X50 PCCB Aero)
1991 928 S4 (stock)
1986 911 Carrera (bad-ass)
2014 Cayenne Platinum (daily driver)
Old 03-18-2009, 07:01 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Feb 2006
Posts: 18
Has anyone actually compared the OEM temp gauge with another meter? I'm new to Porsches, but a long time veteran in the Z scene. The 300ZX (both generations) temp gauges are notoriosly inaccurate and a lot of guys end up using a second temp gauge.

My 84S runs in the same area. New OEM thermostat, water pump, recent coolant change, redline water wetter, etc. Stock fan clutch engages well. Aux fan kicks on just before it hits the 2/3 mark then drops down a little. I was planning just to use a different temp switch on the AUX fan. I believe the stock switch is a 92C switch (i.e. 198 F) before kicking in. I'm considering swap it out with a 82C (180F) switch unless I find some reason not to.
__________________
1984 928S
1988 300ZX Turbo
Old 03-18-2009, 07:12 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
Dean_Fuller's Avatar
 
Join Date: Oct 2008
Location: Columbus, MS
Posts: 845
That temp sounds just fine.
Old 03-18-2009, 07:48 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Network Native
 
Danglerb's Avatar
 
Join Date: Jan 2007
Location: SoCal
Posts: 10,231
S4 as I understand it has the fans controlled by the LH brain, and they are dual electric fans. I don't know the normal temp range, but agree on the dash gauge only being a entertainment device, not an instrument. As long as both fans work, come on with AC as well as temp, and the gauge stays in the normal range, I suspect you are ok.

Zdriver, if your front AUX fan is coming on, except with AC, the clutch fan is bad or the radiator clogged. Its not for normal cooling, just a back up to prevent overheating when the clutch fan starts going bad.
Old 03-18-2009, 09:37 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered User
 
cmcgee's Avatar
 
Join Date: Nov 2005
Location: Vermont
Posts: 33
928 engine temp

Thanks to all for the good info. Now I can worry about something else going wrong.
__________________
Chris McGee
2003 996 TT (X50 PCCB Aero)
1991 928 S4 (stock)
1986 911 Carrera (bad-ass)
2014 Cayenne Platinum (daily driver)
Old 03-18-2009, 10:30 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered User
 
Join Date: Feb 2006
Posts: 18
Quote:
Originally Posted by Danglerb View Post
Zdriver, if your front AUX fan is coming on, except with AC, the clutch fan is bad or the radiator clogged. Its not for normal cooling, just a back up to prevent overheating when the clutch fan starts going bad.
Thanks for the input. Was planning a radiator upgrade anyway. Maybe that will be my push to get me to do it.

I don't think its the fan clutch. It certainly "feels" engaged and seems to be moving a lot of air. Although I realize that is just an observation.
__________________
1984 928S
1988 300ZX Turbo
Old 03-18-2009, 11:12 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Network Native
 
Danglerb's Avatar
 
Join Date: Jan 2007
Location: SoCal
Posts: 10,231
Simple test, let the motor idle, generally that heats it up.

Does the AUX fan come on without the AC running?

Once the temperature is up, drive at a constant speed between 40 and 60 mph for a mile or so, does the temperature drop and hold at about a fixed point?

Yes, yes means clutch fan is bad, and radiator is ok.
Yes, no means could be radiator and or other parts of the cooling system.
Old 03-18-2009, 12:57 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered User
 
Join Date: Feb 2006
Posts: 18
Thanks. Aux fan only comes on sometimes in stop and go traffic - keep in mind I'm in central florida. I'll test it as described. Found a couple of helpful write-ups on rehabbing 928 fan clutches at least to try before buying a replacement.
__________________
1984 928S
1988 300ZX Turbo
Old 03-19-2009, 08:07 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Registered User
 
Join Date: Feb 2006
Posts: 18
If you are still trouble shooting this, I just ran across a really good trouble shooting discussion over on Rennlist.

http://forums.rennlist.com/rennforums/928-forum/422773-water-temperature-help.html
__________________
1984 928S
1988 300ZX Turbo
Old 03-24-2009, 08:33 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Registered User
 
Join Date: Apr 2006
Location: Double Oak, TX
Posts: 312
One issue that can have an effect on the performance of the cooling system is the rear thermostat seal. Most owners do not know it is there and the rubber part deteriorates.
Worth checking and changing.
__________________
www.************
Old 03-28-2009, 06:30 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
 
Network Native
 
Danglerb's Avatar
 
Join Date: Jan 2007
Location: SoCal
Posts: 10,231
Quote:
Originally Posted by ROG100 View Post
One issue that can have an effect on the performance of the cooling system is the rear thermostat seal. Most owners do not know it is there and the rubber part deteriorates.
Worth checking and changing.
That is what is making me crazy, I can't remember if I replaced the rear thermostat seal when I did my thermostat. I suspect I will end up taking it apart to check before summer really kicks in.
__________________
US 83 zinc metallic 5 spd, aka the nice car.
Euro 85 black, 5 spd, the fast rough track car maybe car.
Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 5 years.
Old 03-28-2009, 09:44 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 06:49 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.