Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

Overheating problem

Thread Tools
 
Search this Thread
 
Old 05-28-2011, 09:11 AM
  #16  
Bertrand Daoust
Rennlist Member
 
Bertrand Daoust's Avatar
 
Join Date: Oct 2005
Location: Gatineau, Québec, Canada
Posts: 5,136
Received 1,207 Likes on 467 Posts
Default

First, check if there is coolant circulation
As fare as I know, an easy way to know if there is flow or not is to put your heater to full warm with the car running. If you don't get heat inside, there is no flow.

Like Bill said, if there is no air trapped inside the system, you probably have a bad pump or the system is clogged with something.

When did you change the pump?
If your pump is bad, you won't have any circulation and the upper hose will be quite warm and the lower one will be a lot cooler and both fans won't come on as the rad is too cool to triger the switch.
Been there last spring.

And, if you have to go to the pump again, it is a lot faster and easier the second time!
At the pump, first thing to look at is if the paint marks are still aligned. If they are, the pump is good. If one (or two) is not aligned, something wrong with the pump.
This photo is about one year old so not sure if the paint marks are still the same.

Good luck.
Attached Images  
Old 05-28-2011, 10:33 PM
  #17  
tveltman
Burning Brakes
Thread Starter
 
tveltman's Avatar
 
Join Date: Oct 2008
Location: Palo Alto, CA
Posts: 972
Likes: 0
Received 0 Likes on 0 Posts
Default

I have been in contact with Ed, who advised me to check the same thing. The marks are all still Aligned. I cranked the engine to see if they would slip, but they remained in line. I suppose this must mean that somehow the repair shop plugged the radiator.
Old 05-29-2011, 09:04 PM
  #18  
tveltman
Burning Brakes
Thread Starter
 
tveltman's Avatar
 
Join Date: Oct 2008
Location: Palo Alto, CA
Posts: 972
Likes: 0
Received 0 Likes on 0 Posts
Default

Turns out it is the pump. I wasn't looking at all of the orange marks.
Old 05-29-2011, 10:16 PM
  #19  
jeff spahn
Rennlist Member
 
jeff spahn's Avatar
 
Join Date: Nov 2009
Location: Dubuque, IA
Posts: 8,593
Received 383 Likes on 221 Posts
Default

So the pump worked as designed and didn't lock up? The engine guard system is a success?
Old 05-29-2011, 11:42 PM
  #20  
Mrmerlin
Team Owner
 
Mrmerlin's Avatar
 
Join Date: May 2004
Location: Philly PA
Posts: 27,899
Received 2,254 Likes on 1,247 Posts
Default

thats great that you found the issue .. the next question is why did the pump fail?
Is the connection rubber too weak or
was the heat from losing all of the coolant the cause?
Old 05-30-2011, 03:05 AM
  #21  
Bill Ball
Under the Lift
Lifetime Rennlist
Member
 
Bill Ball's Avatar
 
Join Date: Mar 2002
Location: Buckeye, AZ
Posts: 18,647
Received 46 Likes on 33 Posts
Default

Thomas:

You should have bought a spare rubber piece with Ed's pump. These are wear items. Easy fix. Stan may be onto something with his question as to whether engine overheating did this. I didn't think your overheating was serious enough to cause any problems, but perhaps the rubber piece in Ed's WP is sensitive to heat, softened and failed, even without a significant resistance increase. Too bad.
Old 05-30-2011, 08:26 AM
  #22  
Bertrand Daoust
Rennlist Member
 
Bertrand Daoust's Avatar
 
Join Date: Oct 2005
Location: Gatineau, Québec, Canada
Posts: 5,136
Received 1,207 Likes on 467 Posts
Default

Good.
Now, the question is why?
Let us know please what you or Ed will find.
How long did you have the pump before your coolant lost?



Quick Reply: Overheating problem



All times are GMT -3. The time now is 08:46 AM.