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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 07-18-2016, 06:33 AM
LeatherMermaid LeatherMermaid is offline
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95 325i Overheating

I have a 95 325i which I've had for approximately 2 years. I just started having overheating problems. A hose on the radiator blew off which led to the discovery of a hole in the radiator. The radiator has been replaced. Ran fine, and then the overheating problem began again.

I replaced the water pump, thermostat and both belts. Still overheating. Trying to do troubleshooting and diagnosis versus taking in to the shop.
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  #2  
Old 07-18-2016, 06:47 AM
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ZeGerman ZeGerman is offline
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Have you bled the air out of the cooling system?
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Old 07-18-2016, 06:54 AM
LeatherMermaid LeatherMermaid is offline
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I have not - can you give me some directions regarding this?

Thank you in advance
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Old 07-18-2016, 05:02 PM
LeatherMermaid LeatherMermaid is offline
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Based on my symptoms - this makes complete sense. Thank you. No i did not remove the bleed screw before topping off coolant.

I'm attacking it again on Thursday. I'll post my results.

Last edited by LeatherMermaid; 07-19-2016 at 03:34 AM.
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  #5  
Old 07-18-2016, 07:07 PM
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Quote:
Originally Posted by Jmiller70 View Post
The correct question should be " did you remove the bleed screw first before topping up coolant into your expansion tank ? "
I'm sure you must be familiar with the concept of trapped air pockets as a result of replacing key components of the cooling system, such as the radiator in this. That is why you must use the bleeder screw to actively purge trapped air from the system. It's not as simple as opening up the bleeder screw while adding coolant to the expansion tank.
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Old 07-18-2016, 09:04 PM
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Quote:
Originally Posted by Jmiller70 View Post
Remove bleed screw and expansion tank pressure cap. Pour coolant into expansion tank until mainly coolant escapes from the bleed socket. Replace bleed screw and cap. Is this complicated ?
No, the process you describe is not complicated, but if you perform the process you describe here, you will end up with an overheating E36. I'm not going to argue nits with you, but in my years spent maintaining these cars, I have learned that getting air out of the cooing system is a more involved process than simply opening up the bleeder screw while adding coolant. I personally have never had a problem getting the air out, but if it was as simple a process as you describe, hardly anyone would experience trapped air in their cooling system. In reality, overheating due to trapped air is one of the most commonly posted problems on the internet for E36 BMWs.
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Last edited by ZeGerman; 07-18-2016 at 09:09 PM.
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Old 07-18-2016, 09:57 PM
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LeatherMermaid: I don't agree with all of what Jmiller70 is recommending, and I fear that if you follow his recommendation alone, you will continue to experience overheating. If you search online for how to bleed air from an E36 cooling system, you will find many tutorials. There is pretty solid consensus that getting the air out is a slightly more involved process than Jmiller70 is suggesting here. It's not particularly hard, but there are some steps to follow which Jmiller70 does not cover.
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Old 07-20-2016, 02:15 PM
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[/QUOTE]You believe its about too much air when its actually about too little coolant.[/QUOTE]


In law school they would have termed this "a distinction without a difference". LOL
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Old 07-21-2016, 11:04 AM
LeatherMermaid LeatherMermaid is offline
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I went through the steps of bleeding air off of my system by unscrewing the bleeder screw. It worked! It did not work on the first attempt, I had to turn the car off, let it cool, and went through the process again, but this time, not only squeezing hoses, but also revved the engine which produced more air bubbles. Bottom line, the car is no longer overheating and now I have heat again.
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Old 07-21-2016, 10:18 PM
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ZeGerman ZeGerman is offline
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Excellent! Glad you got it all sorted out. Holding the revs at about 1800-2000rpm helps quite a bit, I've found.
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Old 07-22-2016, 04:22 AM
LeatherMermaid LeatherMermaid is offline
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Thank you

Thank you everyone for your feedback and personal messages. This forum is outstanding and brings out knowledge. Troubleshooting a car I know can be very tedious and full of frustration and joys. Fortunately for me, I saved myself a trip to the repair shop and now the car is working great.

Thanks again for your feedback and for this great forum!
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