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 924/944/968 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Jun 1999
Location: Vernon, CT
Posts: 849
yet another question about running too hot

Hi guys,

My car is running too hot for my liking. it runs between 1/2 and 3/4 on the gauge. I have never had any problems like this until about 3 months ago. It started running hot, and i noticed that my coolant level was low, and my water pump was leaking. I figured the hot running was due to ait that got into the system from the leaking water pump. it never ran over 3/4, I stopped driving it, and replaced the water pump, thermostat, and timing and balance belts. I bled the system like you're supposed to, several times, in fact! Since i have replaced the water pump, the temperature has never returned to normal. Before all of this, the car NEVER ran over 1/2. I've checked the fans and they both operate properly.

I've noticed that, at idle, the air blowing from the fans is warm, but not hot. If i rev up the engine, the air blowing from the fans gets HOT. This tells me that the pump is not circulating enough coolant at low RPM's Once the RPM's come up, all the really hot coolant gets pushed into the radiator, the radiator and fans seem to do their job, of getting the heat out, properly.

Somebody mentioned that it could be a leaking head gasket, which i doubt, since it was changed 15K ago. On my way home today, i am going to stop at an auto parts store and see if i can find one of those things that you put into the radiator cap hole, to see if combustion gasses are present. That should answer the head gasket question.



Any other ideas????? i'm stumped!

Mike

Old 08-13-2003, 09:14 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
Join Date: Aug 2003
Location: Brooklyn, New York
Posts: 159
is ur coolant level still low at times....maybe u have a slow leak somewhere.....where it leaks so slowly that by the time it leaks out its burned up
Old 08-13-2003, 09:19 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Feb 2000
Location: Kingsport, TN
Posts: 2,925
Quote:
I've noticed that, at idle, the air blowing from the fans is warm, but not hot. If i rev up the engine, the air blowing from the fans gets HOT. This tells me that the pump is not circulating enough coolant at low RPM's Once the RPM's come up, all the really hot coolant gets pushed into the radiator, the radiator and fans seem to do their job, of getting the heat out, properly
It could also be telling you that there is restriction in the radiator (or elsewhere) and that more pressure from a faster running pump is needed to get the coolant through.

Also, I would check to see if the pump is slipping on the cam belt. That would not be good.
__________________
Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
Old 08-13-2003, 11:46 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Jun 1999
Location: Vernon, CT
Posts: 849
thanks for the replies.

The coolant level is fine, i've probably only put on 100 miles since the water pump replacement.

The pump shouldn't be slipping on the cam belt, i tensioned the belt properly using the P9201 gauge (yes, i actually bought the $$$$ thing)

The only other thing i can think of would be a clogged radiator. Why would this happen so suddenly?

I picked up the combustion gas leak detector kit yesterday, but haven't had a chance to use it yet. I have my doubts about a leaky head gasket, because the coolant hasn't "boiled" over, like would be typical with coolant system overpressurization because of high-pressure combustion gasses leaking into the cooling system.

Does anyone know what actual temperatures correspond to gauge markings? I can put a thermocouple in the radiator hose, to see if maybe the gauge went bad.

Mike
Old 08-14-2003, 08:23 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
944pete's Avatar
 
Join Date: Jul 2001
Location: Dayton, Ohio
Posts: 176
Garage
I've got the exact same issue. I just changed a leaky waterpump also. I think there may still be an air pocket in the system somewhere. I'm going to bleed the system again. The lack of hot air from the heater points to air in the system. These cars are very touchy about that.
__________________
Pete
1989 944S2-Dove Blue Metallic
1985.5 944-Alpine White--sold

My P-car Online Profile
Old 08-15-2003, 08:37 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
Join Date: Dec 2002
Location: Monett, MO
Posts: 1,085
just in case, take the cover off and see if you can turn the waterpump by hand, if so, retension it,
Old 08-15-2003, 10:41 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered User
 
TCMdocs944's Avatar
 
Join Date: Dec 2002
Location: St. Petersburg, Florida
Posts: 1,990
__________________
83 944 white w/Boxster wheels
Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
Old 08-15-2003, 06:35 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered User
 
TCMdocs944's Avatar
 
Join Date: Dec 2002
Location: St. Petersburg, Florida
Posts: 1,990
Ooopps, I think this pic is in centegrade...No the us farenheit
__________________
83 944 white w/Boxster wheels
Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
Old 08-15-2003, 06:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
vott does ziss do?
 
ronin's Avatar
 
Join Date: May 2003
Location: Seattle
Posts: 6,676
definitely centigrade
__________________
Old 08-15-2003, 09:38 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered User
 
Join Date: Dec 2002
Location: Monett, MO
Posts: 1,085
that's the outside temperature gauge

Old 08-16-2003, 09:01 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 09:24 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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.