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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E34 (1989 - 1995)

E34 (1989 - 1995)

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  #1  
Old 03-22-2013, 04:14 PM
TWard's Avatar
TWard TWard is offline
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Location: North carolina
 
Join Date: Jul 2009
Posts: 682
Mein Auto: 91 e34 525i
Thermostat

Guys Ive never diagnosed a thermostat, so I need some help.

Car is overheating, I cant find any leaks and coolant level is staying the same.

The top radiator hose has pressure the bottom doesn't at all.

Also I cut the engine off and it sounded like someone was just pouring water, Couldnt verify where the noise was or what it actually was

So whats the cause guys?
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  #2  
Old 03-22-2013, 04:44 PM
haolibird haolibird is offline
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Location: san diego
 
Join Date: Dec 2008
Posts: 500
Mein Auto: E39 540i, E39 M5, E34 535
Mr TWard,

It sounds like a T Stat.
Is the bottom hose cool?

As far as diagnosing the tstat, you can remove it, place it in a pan of water, bring water to a boil, and see if the thing opens up.

Cooling problems suck, plain and simple.
Good luck.

The Bird
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  #3  
Old 03-22-2013, 06:25 PM
imae34driver imae34driver is offline
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Location: Orange County , CA
 
Join Date: Feb 2013
Posts: 2,172
Mein Auto: 1995 540i SPORT /6 spd
Forget boiling it. No one actually does this.

Remove it. It will warm up slow and never overheat.

If you are gonna bother to take it out though id just spend 12$ And replace it.

Dont mess around with cooling systems do it right or better than right if you like your head gasket and head


fck honda

Last edited by imae34driver; 03-22-2013 at 08:26 PM.
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  #4  
Old 03-22-2013, 06:34 PM
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TWard TWard is offline
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Mein Auto: 91 e34 525i
Yea I just bought the parts but i figured id ask, it is a simple cooling system.

I'm going to replace and see what happens, the car has sat for 2 years
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  #5  
Old 03-22-2013, 06:43 PM
imae34driver imae34driver is offline
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Location: Orange County , CA
 
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Mein Auto: 1995 540i SPORT /6 spd
Car sat for 2 years and now the t stat is stuck..


What a qawinki dink!

Huh, Ya its probably bad hahahahahahahaha

Bet that sound was the stat cracked open just a touch from overheating temps and all the top end hose pressure sitting on top dripping down into bottom hose not nearly fast enough to cool anything, just enough to here.

Last edited by imae34driver; 03-22-2013 at 06:47 PM.
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  #6  
Old 03-22-2013, 07:04 PM
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TWard TWard is offline
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Location: North carolina
 
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Mein Auto: 91 e34 525i
yea tomorrow i get to find a way to take the fan clutch off without a 32mm wrench...
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  #7  
Old 03-22-2013, 07:06 PM
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Radian Radian is offline
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Mein Auto: '91 535i 5-spd
Quote:
Originally Posted by imae34driver View Post
Forget boiling it. No one actually does this.
"How you 'spect to check one before hand, Mr. Dufresne-if-you-please?"

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  #8  
Old 03-22-2013, 07:09 PM
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Radian Radian is offline
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Mein Auto: '91 535i 5-spd
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Originally Posted by TWard View Post
yea tomorrow i get to find a way to take the fan clutch off without a 32mm wrench...
Buy a wrench for $8 at a bicycle shop instead of messing up a belt, pulley, or bearing using the wrong tool.
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  #9  
Old 03-22-2013, 07:36 PM
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BMR_LVR BMR_LVR is offline
Humble E34 lover
Location: Asheboro, NC
 
Join Date: Dec 2008
Posts: 5,264
Mein Auto: 1992 525i
Quote:
Originally Posted by Radian View Post
Buy a wrench for $8 at a bicycle shop instead of messing up a belt, pulley, or bearing using the wrong tool.
^ +1

T, are you in Lexington or Charlotte now?
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Quote:
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It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #10  
Old 03-23-2013, 06:53 AM
south26 south26 is offline
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Location: Dayton, OH
 
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Mein Auto: 535i 1989
Or you can go to autozone or Napa and but a 1 1/4 inch wrench, they are the same size. That is what I have always used.


Andy
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  #11  
Old 03-23-2013, 07:01 PM
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TWard TWard is offline
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Mein Auto: 91 e34 525i
well, I didnt change the thermostat today, i drove the car a couple of miles and it sucked all the coolant in the tank down, I added and added and it hasnt over heated yet. So my guess is yes it is a stuck thermostat but it can wait ill take it to my shop and use the proper BMW special tools to take it apart.
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