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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 08-18-2014, 01:13 PM   #1
DunkM94
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Join Date: Oct 2012
Location: Marietta, Ga
Posts: 13
My Ride: '00 323i
Questions! My greater hose blew but the car didn't overheat

My car is a 2000 323i manual. I was sitting in traffic in Alabama (Iive in Georgia) and then had huge plume of coolant come out, it took me about 10-15 seconds and a 50-100 ft drive before I could get to a parking lot, I knew if I saw the temp rise at all I was going to just shut it off and sit there. But it didn't. I replaced the hose and the coolant and the engine cranked right up. I have had no coolant leak or issue with temperature since this happened on Saturday. The car still feels strong.

After graduating from the e36 to the e46 I have been deathly afraid of overheating due to the aluminum block. So I guess I was wondering if the e46 geniuses would school me on the finer points of the cooling system.

Some questions I have:
1. At what temperature can damage begin to occur to the head or block? And what does this equate to on the temp gauge.
2. Is it likely that head gasket will go before the block/head.
3. When is the electric fan supposed to be on. (Does it turn off after you start driving?)
4. If a leak gets in the system, can the car try to close off things, like the heater valve, in order to try to keep coolant?




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Old 08-18-2014, 05:55 PM   #2
Tangent_
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Join Date: Jun 2006
Location: San Jacinto, CA
Posts: 2,185
My Ride: '01 330i
1. Not sure about the exact temperatures, but once the gauge starts moving to the right of straight up, you're riding the ragged edge of disaster already.
2. If the head gasket goes odds are pretty decent the head has warped.
3. It runs when the A/C is on and when the coolant temperature switch calls for it. It's a variable speed fan so unless you listen for it carefully or are right under the hood, you might never even hear it.
4. No such luck. It's a simple system and won't do any protective measures if coolant level drop is detected.

As long as you keep up on preventative replacement of hoses and the expansion tank, and bleed the system properly it should be just fine. 60k miles is a generally accepted safe replacement interval for the expansion tank. Some will last far longer, some unfortunate ones less. From your description I wouldn't worry about having overheated; you responded quickly and shut it off before temps rose much (if any) above normal.
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Old 08-18-2014, 06:21 PM   #3
DunkM94
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Join Date: Oct 2012
Location: Marietta, Ga
Posts: 13
My Ride: '00 323i
Funny enough, that hose and my expansion tank were on my list of things I was going to do next week. I still plan on doing the expansion tank. I have already done the radiator to thermostat hoses. Along with the radiator.

On a side, this is the 4th or 5th thing that my previous owner had "replaced" since he bought the car in 2011. I even have the receipt for it. All cooling parts too. Besides a remaned alternator from pepboys... None of these parts were oem or oem equivalent. And I've been replacing stuff with contitech or oem stuff. The stuff I put in was so much better than the stuff I took out.

I am a firm believer of the quality of oem at this point.
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