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Old 05-05-2004, 05:06 AM   #1
Autotechnica
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Problem with engine overheat!, Installed new rad and refilled coolant

I just swapped out my stock rad because it was damaged for a replacement which is the same make. After I reinstalled the rad and all the hoses I start the car and after a while it starts to overheat. Is the coolant getting to the engine properly? I filled it to the "Kalt/Cold" line while the engine was cold. Even with my fan on full blast the engine overheated. It can't be the fan, so it must be the coolant or rad. Any ideas on what's wrong? The coolant level was about 1cm below the "cold" mark. Would this cause the engine to overheat?

Thanks,

Bryan
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Old 05-05-2004, 06:19 AM   #2
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Bry, try bleeding the system again. It sounds like you have some air trapped in there. I used this link when I did my flush. I don't know if it differs from the 318 but it should give you an idea.

http://www.logun.org/radflush.htm
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Old 05-05-2004, 06:23 AM   #3
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ya i think for sure an air lock
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Old 05-05-2004, 02:00 PM   #4
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Also make sure that when you're doing this that you have your heater on full hot.
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Old 05-05-2004, 02:30 PM   #5
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im thinking its a air lock
saw it on tv
the guys car was overheating cause there was air in the line and in the system

get the air hose out
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Old 05-05-2004, 06:17 PM   #6
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hmm...i would agree on th air lock....
try bleeding it..if it insists...

then i would say that it's the water pump....the stock water pump came with plastic fins (easily broken with time and heat)...and the updated version of the water pump for the e36 come with metal fins....
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Old 05-05-2004, 06:38 PM   #7
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i agree with Russian325is i just went threw this like 2 weeks ago
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Old 05-05-2004, 06:40 PM   #8
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Ok thanks guys, I did this and fixed the overheat problem.

Here's another problem. I fill up the coolant in the top off tank to the "cold" mark when the engine's cold. I start the car and run it till it's warm, all the coolant in the top off tank is gone. I fill it to the mark again, start the car and minutes later the coolant is gone once again. Do I just keep filling it up like this until it stays at the max mark or what? It's not leaking, I checked.

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Bry
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Old 05-05-2004, 06:49 PM   #9
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did u just do a flush if so i im guess it would need to refill the whole system again
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Old 05-05-2004, 06:50 PM   #10
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hmmm...
no leaking...

try filling it up with the engine running...
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Old 05-05-2004, 06:58 PM   #11
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Quote:
Originally posted by Russian325is
hmmm...
no leaking...

try filling it up with the engine running...
When I fill it while the engine is running, should I also remove the vent cap? Also, do I fill to the "cold" mark while the engine is running?

Thanks,

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Old 05-05-2004, 07:37 PM   #12
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Quote:
Originally posted by Autotechnica
When I fill it while the engine is running, should I also remove the vent cap? Also, do I fill to the "cold" mark while the engine is running?

Thanks,

Bryan

I wouldnt do that, I would run the car, then turn it off and let the engine cool off, as well as the coolant.

once every thing is cooled own check the level, if you need to add then add more.

the coolant expands and contracts to different engine temps, so i really wouldnt fill it while its running.
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Old 05-05-2004, 07:42 PM   #13
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Ok thanks for your helps guys. I topped it off and used 2 full bottles 9L of mixed Prestone coolant. I must have drained almost all of it when I removed my rad. I never drained it from the block though.

Anyways, now it reaches the mark properly when the car is on and off.

You guys were a great help.

Thanks

Bry
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Old 05-05-2004, 08:19 PM   #14
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When my old e36 had a new rad put in it took a while for the whole coolant light to go off, kept filling it up and then it stopped.
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Old 05-05-2004, 08:20 PM   #15
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Quote:
Originally posted by Autotechnica
Ok thanks for your helps guys. I topped it off and used 2 full bottles 9L of mixed Prestone coolant. I must have drained almost all of it when I removed my rad. I never drained it from the block though.

Anyways, now it reaches the mark properly when the car is on and off.

You guys were a great help.

Thanks

Bry
I am pretty sure BMW recommends not to use prestone. Just the heads up.
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