Question about 1999 BMW 323 Series

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I just replaced my coolant expansion tank cause it had a huge crack in it, i put everything thogether and everything, but when i drove it home last night the temp guage starting going to the red but i dint hear see or smell anything wrong but it went to the red. I just left it somewhere cause i was too scared to drive it. Does the radiator need water or something?

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Bleed the system...you got an air pocket in the system.

Posted on Aug 26, 2010

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My van over over heated"I let cool down then put water in reserve tank,it drove to house got hot again ,now it won't start at all,could it be safety fuse,?


fuse?had oil? don't think so how hot did it get check rad.make sure water in it ,if got really hot might be froze up chek battery also must have good battery

Apr 29, 2016 | Cars & Trucks

2 Answers

Oil found in coolant


The lubricating and cooling systems are isolated from each other in your car. They should never mix under normal conditions. They mix typically when a crack in the engine block exists - or - if the head gasket is damaged. You will probably find the there is coolant in the oil pan, too. A white / frothy substance on the dip stick will be evidence of this.

A head gasket replacement can be a costly repair - but often significantly less than a cracked engine block. It can require a fair amount of work to determine which caused the problem. Depending on the age of the car, mileage, etc. - it may not be worth fixing / replacing. Consult a trusted mechanic to help you best determine your options.

Good luck!

Apr 16, 2014 | Audi TT Cars & Trucks

1 Answer

Coolant is not flowing into expansion tank via little hose and car is overheating. As it is getting hot the coolant bubbles and spits coolant through the little hose but it is sputtery like it is tryi


coolant will not flow from the return pipe continuously.when the engine heats the coolant expands returns to tank. coolant fan starts engine cools down return pipe flow stops . fan stops after times, again coolant heats up and flows through the pipe. this cycle continues and go on.

Feb 28, 2012 | Audi A4 Cars & Trucks

1 Answer

I WANT TO KNOW HOW TO REMOVE THE COOLANT RESERVOIR ON A 2000 BMW 323CI


Are you talking the expansion tank? If so - Drain coolant first by going underneath the car and take off the protective shield and unscrewing the blue plastic screw (make sure the car is NOT hot!), under the reservoir you'll see an electronic sensor - carefully twist is a 1/4 turn counterclockwise and gently pull downward to remove this sensor don't force it, you don't want to pay $150 to replace it. Disconnect the hoses on the top and bottom of expansion tank by pulling up the metal tabs upwards then pulling the hose away from the tank. I believe there are two or three screws which hold the expansion tank bracket in place, unscrew these and pull the bottom of the tank away from the radiator then lift upwards on the bracket (the bracket and expansion tank should then come out). Get the old expansion tank off the bracket and replace. You want to take off the bracket because getting a new tank on the bracket is a B*TCH!

Reconnect in reverse order.

Make sure to bleed the cooling system properly to remove air pockets (please use BMW coolant and distilled H20 in 50/50 mix - it's not the same as your Prestone or other mass produced coolants). Last replace the expansion tank cap because that might have created the expansion tank cracking.

Good luck and hope this helps

Dec 16, 2010 | 1999 BMW 323 Series

1 Answer

'02 626 overheated earlier in the week. drove home. appeared to be out of coolant. replaced overflow tank(seal blown), added coolant, however it still overheats. what else to check?


Whenever you overheat once, then the thermostat must also be replaced. It is operated by the expansion of a contained wax pellet, and overheating causes permanent loss of wax.
However, you may also have caused a head gasket leak now from heat warpage. If the thermostat does not help, then borrow a cooling system pressure checker from a place like Autozone, and see of it holds pressure for 5 minutes after pumping it slightly above cap rating. Then start engine and see if it is steady or oscillating from 1 cylinder leakage.

Sep 04, 2010 | 2002 Mazda 626

3 Answers

My coolant expansion tank overflows after 20 minutes of running the engine


you either have a blown head gasket or cracked head both reasons will put compression gas into coolant system since air gets hotter faster than coolant any air in system will cause very fast over heating and push coolant out. the ford 3.0 is has a record of this problem the fix is not cheap and if you do it your self or have a shop do it both heads should be done and the t stat also replacing water pump would be wise

Feb 17, 2010 | 1996 Mercury Sable

1 Answer

I have a 2004 BMW 330i and have replaced everything in the coolant system, and my vehicle is still leaking coolant out the expansion tank, or the cap where you add coolant to the radiator. I have use OEM...


We have had some similar problems with some BMW's,the last one we replaced the expansion tank.Before we attached the upper radiator hose to the radiator we filled the engine with antifreeze through the hose.Install the hose and fill your expansion tank to the proper level and run the engine to operating temperature.

Jan 30, 2010 | BMW 330 Cars & Trucks

3 Answers

Audi A4 2.5 V6 TDI - Creamy grey coolant in expansion tank


Sounds like blown head gasket (or worse) still to me.
Remove oil filler cap and look for grey oil.
Never use water these days but special coolant. Water makes vapour spots and cause block cracks, worse then blown gaskets!!!
vapour does not cool very well.
Look like you have cracks already.
Take a compression test if possible. But might not show op at that temperature.
The gauge indication troubles me.

Apr 14, 2009 | 1998 Audi A4

2 Answers

Daughters 1996 ford contour 4 cyl. died on the road.After sitting a while it started again then drove it home.It starts and runs good but after warm up it bubbles out the expansion tank, I replaced the cap...


dear sir,

the solution to your problem is simple. yes you say that it has a new water pump, but the reason that a vehicle bubbles out of the expansion tank is because the water pump is not circulating coolant, the coolant boils in the engine and bubbles out of the expansion tank. secondly the reason the fan never kicks in is because the temp sensor is not seeing the heated coolant because the water pump is not circulating the coolant through the cooling system. 3rd. the heater never gets hot because the water pump is not circulating coolant through the heater core in order for it to get hot and provide heat. and the temperature gauge never seems to go up because yup you guessed it, the water pump isnt circulating coolant in order for the engine temperature sensor to see hot coolant and thus send a signal to the engine temperature gauge as to the coolant temperature. i know you said it has a new water pump, but i have heard that this type of vehicle may come with a plastic fin pump. i would remove the pump and check the passages for foreign matter{ trash} in the passages as well as the condition of the new pump. also one last thing, the reason the vehicle died on the road in the first place was probably because it overheated. happy hunting and please post to see what you found. i am a mechanic by proffession.

Dec 17, 2008 | 1996 Ford Contour

1 Answer

Coolant issue


broken fan belt water pump dont turn water dont circulate its gonna overheat alternator dont turn battery light stay on you said the bottle was full and when it cool down it was on low level that normal radiator took back what it was missing check the belt HOPE IT HELP FIXYA OUR POST THANKS PIERRE

Jul 11, 2008 | 2002 Mazda Protege

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