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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 02-08-2009, 03:20 PM   #1 (permalink)
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overheating help help

tryed to get airlock out today but it was just a nightmare ! im sure the head gasket is blown .when i take the oil cap off the car starts to idle funny and it blows the water out the rad when you rev it up ..i took off both pipes from the heater matrix and no water is comeing out the pipes ! does any one have an idea???
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Old 02-12-2009, 08:34 PM   #2 (permalink)
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Sounds like the system needs to be bled, raise the front of the car slightly and use the bleed screw to let the air out. Set the heater on high and raise the rpms. The crankcase operates under a vacuum so the idle will change if you remove the fill cap or the dipstick. A head gasket would put coolant in the oil, "mayonaise" on the underside of the cap and the oil on the dipstick would be milky looking. The exhaust would be white and smell "sweet".

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Old 02-12-2009, 08:42 PM   #3 (permalink)
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Big +1 ^ with jmo69 post......Bleeding is a little tricky & may take a couple shots,
but here is the best way to do it.....


overheating help help-bleedscrewtank.jpg
It really helps to have a friend lend a hand by sitting in the car revving the engine and keeping an eye on the temp gauge. Start off by removing the coolant reservoir cap and the plastic bleeder screw right next to it. Fill the coolant reservoir with a 50/50 mix of coolant and distilled water. Have your friend start the car, turn on the heater to full hot on the vent position and rev the engine to about 2500 RPM, if the temp gauge goes past the 12 o'clock position, shut the engine off, let it cool down and start over again. Watch the coolant reservoir, as the engine warms up the coolant level should drop, refill as the coolant is sucked out of the reservoir. Watch the bleeder screw hole also, when coolant with no air bubbles begins to overflow then you're almost done. It's a good idea to have some paper towels handy to mop up any overflow. Screw the bleeder screw back in (be careful to not break the plastic screw) and continue to rev the engine, you should see a continuous stream of coolant spraying in to the reservoir from the small hole at the top. Continue letting that spray in to the reservoir while your friend revs the engine for a couple of minutes, until the gauge hits the 12 o'clock mark, to ensure any remaining air is gone. If the heater is blowing hot air when you're revving the engine AND when the engine is at idle then your cooling system is properly bled. If your vents are blowing cool air at idle then you still have air in the system, try revving the engine more and/or squeeze the radiator hoses to help dislodge any trapped air. Once your system is fully bled, top off the reservoir and replace the cap. Check the coolant level in a day or two and top off as needed.
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Old 02-13-2009, 01:34 PM   #4 (permalink)
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thanks guys ! the car is doing my nut .i forgot to say the rad pipes also go hard like there going to explode or something?
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Old 02-17-2009, 05:52 PM   #5 (permalink)
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these guys got you covered bleeding it sucks get like 2 bottles of distilled coolant and have someone at 2500 or so i got pissed and had them hold it a 3,500 the higher the rev the more fluid comes out i didnt raise my car just leave the cap off open the bleed screw have them hold gas and watch the fluid and yeah keep heat on good luck i dont understand what you mean about the hoses
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