Question about 1999 BMW 323 Series

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Rapid overheating. New thermostat didn't fix it. Head removed... gasket ok. No apparent cracks in head. Main fan/clutch seems to work ok. Any ideas ? Mike in NZ

1992 320i Rapid overheating. New thermostat didn't fix it. Head removed... gasket ok. No apparent cracks in head. Main fan/clutch seems to work ok. Any ideas ? Mike in NZ

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  • mikejb33 May 21, 2009

    Thanks for help. Yes, done all that. Absolutely sure re orientation of thermostat. Tried all the rituals of air bleeding. Looks like the head is going away to be checked for micro-cracks. Thanks everyone for assistance. Mike in NZ

  • mikejb33 May 21, 2009

    Thanks for help. Yes, done all that. Absolutely sure re orientation of
    thermostat. Tried all the rituals of air bleeding. Looks like the head
    is going away to be checked for micro-cracks. Thanks everyone for
    assistance. Mike in NZ


  • Richard Scordino May 11, 2010

    Have the head dye checked. often they crack in strange places and are nearly invisible. A ten year old radiator can also be partially blocked internally.

  • yadayada
    yadayada May 11, 2010

    has all the air been bleed out of the cooling system? has the radiator been cleaned by a pro radiator shop?

  • Anonymous Mar 21, 2014

    How much does it cost to fix a crack head gasket on a VW passt

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I know that this is going to sound like of dumb but I would check and make sure your thermostat was installed the correct way. I had a similar issue once, after replacing the entire cooling system on a 750iL it still over heated, turned out I put in the thermostat the wrong way. Always check for little mistakes first:) Hope this helps and please don't forget to rate me.

Posted on May 21, 2009

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The three most likely thing's cause overheating are faulty thermostat,electric fan or clogged radiator. Only at has been overheat so much it boils dry that it will cause engine trouble. Most common problem's are blown cylinder head gasket or a cracked cylinder head.
mixing coolant and water depends on where the gasket has blown or head is cracked. You will first need to check if it actually is overheating. The reason is. If the head is cracked or gasket blown then you can get a false boiling which is compresion from the cylinders blows through the crack in the head or gasket causing the coolant to blow out of the radiator cap.Fill the radiator to the top leave the cap off then start the engine.If the water blows out then you will need to remove the cylinder head check the gasket is ok. If its damaged replace if not get the head checked for crack's. If no water blow's when you start it check the thermostat is working properly. To check the thermostat put it a in a saucepan cover it with water bring the water to the boil. It should open before the water boil's but near boiling-point. If its ok then start the engine again leave it running until it boils and check the fan is running. If that's ok then its radiator problem. Their is no way to check if the radiator is ok you will need to get a new one. One last point. If the cylinder head or gasket are faulty it was caused by overheating so by just fixing the cylinder head problem is not a cure it will overheat again. Check the three things I mentioned at the begining and told you how to check them. Hope this help's. Cheer's

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Its not impossible for there to be a bad head gasket or leaking. But I agree with you the over heating will be there during driving as well. I would change the fan clutch and replace the thermostat, if the thermostat that was replaced wasn't an oem/delaer thermostat, I would change it. From prior experience with these type of vehicle the most likely cause of overheating thermostat and fan clutch. Aftermarket thermostat just aren't good for this vehicle I have proved it a few times for myself. Take my advise and change the thermostat with an oem one and the fan clutch with an oem. Good Luck. Get in contact with me if you need more help.

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2 Inspect Belt Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s). grey_line.gif 3 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. grey_line.gif 4 Inspect Radiator Cap Worn or damaged radiator cap grey_line.gif 5 Inspect Thermostat Thermostat stuck closed grey_line.gif 6 Inspect Fan Blade Broken, missing, or defective fan blade(s). grey_line.gif 8 Inspect Water Pump Damaged, worn or leaking water pump. grey_line.gif 9 Inspect Intake Manifold Plenum - Perform Leaking water pump gasket. grey_line.gif 10 Inspect Cooling Fan Control Faulty cooling fan control or circuit. grey_line.gif 11 Inspect Cooling Fan Switch - Radiator Faulty radiator cooling fan switch or circuit. grey_line.gif 12 Inspect Engine Temperature Sensor Faulty engine temperature sensor or circuit. grey_line.gif 13 Inspect Temperature Switch Damaged or faulty temperature switch or temperature switch circuit. grey_line.gif 14 Inspect Fan Clutch Worn, loose or faulty fan clutch. grey_line.gif 15 Inspect Ported Vacuum Switch Damaged, leaking, or faulty ported vacuum switch. grey_line.gif 16 Inspect Radiator Obstructed radiator core or radiator cooling fins. grey_line.gif 17 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders here is a list of things to check Shaun

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