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E34 (1989 - 1995)

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  #1  
Old 01-22-2013, 11:53 AM
bmr95 bmr95 is offline
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Mein Auto: 1995 bmw 525i
e34 no heat

Hello all
Pretty new to this forum. so excuse any obvious things that i mention/miss.

I have a 1995 bmw 525i (e34) and found out yesterday the heater is not putting out any heat. The fans work but blow out cold air. Also the Temp. gauge gets to middle when idel but when I drive on highway (65mph) in cold weather it drops to where the blue mark is...

Should the temp gauge be middle during driving conditions? I think once I figure out the why the gauge isnt staying in the center while driving, that will also fix my heating issue.

any advice would be appreciated.

EDIT: Thank you for your replies. Yesterday I did let the car heat up at idle until the temp. gauge reached middle, then turned on the heat...and it was just barely warm not as hot as I expected.

Last edited by bmr95; 01-23-2013 at 05:15 AM.
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  #2  
Old 01-22-2013, 11:56 AM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Mein Auto: 1992 525i
Sounds like your thermostat has stuck in the open position.
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  #3  
Old 01-22-2013, 12:05 PM
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BMWFatherFigure BMWFatherFigure is offline
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Mein Auto: E23;E30;E38;E32;E34 +
or sticks open now and again - replace it anyway...
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  #4  
Old 01-22-2013, 08:40 PM
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+1

on the bright side, its not overheating...
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  #5  
Old 01-23-2013, 07:00 AM
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TemporarySanity TemporarySanity is offline
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Mein Auto: 2000, 1995 540iA, 07 525
I concur with the thermostat replacement. When I had the same issue, I found that my thermostat was broke and stuck in the open position. It took care of my no heat issue. Also, you may have a clogged heater core but that can usually be flushed out. Good luck and let us know it that works for you
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  #6  
Old 01-23-2013, 07:18 PM
snowsled7 snowsled7 is offline
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I agree with the thermostat. The fact that the engine cools at highway speeds proves it bad.

You may also have a problem with the aux coolant pump. If it is not working very little warm coolant will flow through the heater core and your heat will be weak.

Blocked system was also mentioned. How long since the last coolant flush?
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  #7  
Old 01-24-2013, 10:54 AM
bmr95 bmr95 is offline
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Quote:
Originally Posted by snowsled7 View Post
I agree with the thermostat. The fact that the engine cools at highway speeds proves it bad.

You may also have a problem with the aux coolant pump. If it is not working very little warm coolant will flow through the heater core and your heat will be weak.

Blocked system was also mentioned. How long since the last coolant flush?

I have had the car for about a year and month have just added coolant have not flushed the system. Hopefully its is something I can do myself. Also can someone recommend which thermostat I should get (manufacturer and where i can purchase)? And coolant type that I should use. I heard we need a special BMW coolant..is that true?
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  #8  
Old 02-04-2014, 03:49 AM
rswapp rswapp is offline
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Mein Auto: 95 540I
Quote:
Originally Posted by bmr95 View Post
I have had the car for about a year and month have just added coolant have not flushed the system. Hopefully its is something I can do myself. Also can someone recommend which thermostat I should get (manufacturer and where i can purchase)? And coolant type that I should use. I heard we need a special BMW coolant..is that true?
Best price that I've found is from RockAuto, do a search for a discount code prior to purchasing it'll knock another 5% off.
Behr, Beck/Arnley, Gates, Stant, Valeo, Hella are all good brands have never had a problem running any of them.

Hope this helps.

Last edited by rswapp; 02-04-2014 at 03:51 AM.
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  #9  
Old 02-04-2014, 07:58 AM
imae34driver imae34driver is offline
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Location: Orange County , CA
 
Join Date: Feb 2013
Posts: 1,899
Mein Auto: 1995 540i SPORT /6 spd
After a motor swap from basically 200k on store bought coolant to a motor with 100k and had BMW blue its whole life..

I can say blue is the way to go... Blue's cooling system was completely clean and shinny all through it!

prestone had NASTY corrosion threw the entire system.!

My car never over heated do to it but,
My heater core eventually gave way as a result.


When you do the thermostat, get the best you can, then if you want to, poke a pencil sized hole in it..


Just enough so that it will still warm up fine, but if it sticks closed it won't over heat..
Its a trick particularly favored with off roaders.. I see little in the way of downside.
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Last edited by imae34driver; 02-04-2014 at 08:03 AM.
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