Question about 2001 BMW 5 Series

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Antifreeze comes out overflow and the van gets hot idling

I keep antifreeze in the radiator and overflow. After I drive about 15 miles or in stop and go traffic it will get hot and antifreeze leaking out, I think through the overflow tank.

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  • boatswain197 Feb 20, 2009

    the same exact problem

  • Mark Egan May 11, 2010

    If the vehicle has over heated consistently, the thermostat may be damaged from overheating. They usually fail closed when overheated.

    But then we need to find the reason for the initial overheating. Did the vehicle go low on coolant at some point, overheated, and you refilled it with coolant, and it's been doing it ever since?

    Does the vehicle use electric fans for radiator cooling, and are they running? They may not run initially on cold engine start, but as the engine warms, they should come on. Check to see if this happens.

    Reply back what you find, and I will help you more.

  • Jeremy Reddick
    Jeremy Reddick May 11, 2010

    Have you checked your thermostat to see if it is functioning correctly?

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THERMOSTAT FAULTY...OR ELECTIC COOLING FAN FOR THE RADIATOR...HOPE I WAS OF SOME HELP TO YOU.....

Posted on Feb 23, 2009

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Posted on Jan 02, 2017

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2 Answers

If i just put water and no coolant could this make my car over heat


No your car will not overheat, but it is advisable to my 50% coolant on the water to prevent deposits of rust and other debris that may affect the effectiveness of the cooling system.

Mar 26, 2017 | Cars & Trucks

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My antifreeze keeps turning brown and full of sludge. Why is this happening?


most probably a failed/split transmission cooler in the radiator tank
If that is the case , the fix is a new radiator and a chemical flush of the radiator
get quotes from an accredited radiator shop after getting a proper diagnosis of the fault

Apr 07, 2016 | Cars & Trucks

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My sunfire overheats and leaks out overflow everytime i drivee it.i changed water pump,thermostat the fan is working fine and had a water pressure test done last mth


DID YOU BLEED AIR OUT THE COOLANT SYSTEM.TO BLEED COOLANT SYSTEM, FILL THE COOLANT SYSTEM THROUGH THE RESERVOIR TANK OR THE RADIATOR UNTIL THE FULL COLD MARK IS REACHED.BESURE TO USE 50/50 HALF WATER AND ANTIFREEZE.YOU CAN BUY ANTIFREEZE THAT IS ALREADY PREMIX 50/50.AFTER ADDING ANTIFREEZE TO RESERVOIR OR RADIATOR FILL RADIATOR TO FULL MARK OR IF YOU DONT HAVE RADIATOR CAP ON RADIATOR POUR ANTIFREEZE IN THE OVERFLOW JUG UNTIL COOLANT LEVEL STAY THE FULL COLD MARK.WAIT AWHILE UNTIL COOLANT LEVEL STOP DROPPING.NOW INSTALL THE RADIATOR OR OVER FLOW JUG CAP.START THE ENGINE AND ALLOW IT TO RUN UNTIL NORMAL OPERATING TEMPERATURE IS REACHED AND THE UPPER RADIATOR HOSE BECOME HOT.STOP THE ENGINE AND OBSERVE THE COOLANT LEVEL IN THE OVERFLOW JUG. THE COOLANT LEVEL SHOULD BE AT THE FULL HOT LINE.ALLOW THE ENGINE TO COOL UNTIL THE AMBIENT TEMPERATURE IS REACHED THEN CHECK THE COOLANT LEVEL IT SHOULD BE AT OR ABOVE THE FULL COLD LINE.ADD MORE COOLANT IF NECESSARY. WARNING BECAREFUL WHEN OPEN THE RADIATOR CAP OR JUG OVER FLOW CAP.USE A LARGE RAG OVER THE RADIATOR CAP TO KEEP FROM GETTING SCALDED.OPEN RADIATOR CAP A LITTLE AT A TIME TO KEEP FROM GETTING SCALDED.WAIT UNTIL ENGINE COOL DOWN BEFORE OPENING RADIATOR CAP OR OVERFLOW JUG CAP.WEAR SAFETY GLASSES.

Jul 12, 2011 | Pontiac Sunfire Cars & Trucks

2 Answers

The radiator was emptied out and i want to add antifreeze and water? there are 2 areas that say antifreeze goes here?


  • One is the radiator and the other is an overflow tank. Sometimes anti freeze will back pressure a bit and need somewhere to go and other times the antifreeze gets low in the radiator. That is the purpose of the radiator.
  • Put the antifreeze in the radiator fist and then add to the reservoir. Pay attention to the cold/hot level fill on the overfill tank.
  • You need to find out where all that antifreeze went to if the radiator was empth. Pull the dipstick and look for a chocolate milk look on the oil. This would be a head gasket or a cracked head.
  • Otherwise keep an eye out for a leak and repair it soon.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

Jun 15, 2011 | Ford F-250 Cars & Trucks

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Heater blows cold air when the truck is idling or in stop and go traffice


a question to an answer: is your truck has any heat when you rev it 2000 rpm, or above?
have you check your coolant level? if level is low you have a small coolant leak, a water pump may be at fault, and causing air pockets in your heater core, check for leaks your self, dealer wont tell you if vehicle still under warranty.
good luck

Feb 03, 2011 | 2006 Nissan Frontier

2 Answers

Heat is not working - coolant was low so filled it.... problem here... heard something about an air pocket


If you dont have an external coolant leak anywhere under your hood that has shown up on your driveway it could be the intake manifold or the headgasket leaking. Also check the thermostate to solve the heat issue.

Jan 05, 2011 | 1998 Pontiac Bonneville

2 Answers

My car is rumming hot and the antifreeze is leaking I'm thinking it's my water pump


It could be the water pump , or something else , like a faulty thermostat. Where is the coolant leaking from ? If it is leaking from the water pump , then yes , your pump might be toast.
If the thermostat is no good , the engine will warm up to normal temp , and then overheat quite quickly. As it overheats and the coolant expands and boils , it could back up into the overflow reservoir and leak out onto the ground. You need to get someone to diagnose the problem ASAP , running your engine in an overheat condition could very quickly blow your head gasket and/or warp a cylinder head. If you can , please post a bit more info. Does it run but at a higher than normal temp. Does it only overheat when stopped in traffic etc.
Could be water pump , or thermostat , or plugged up radiator , or nonfunctioning cooling fans.

Nov 22, 2010 | Ford Taurus Cars & Trucks

1 Answer

COOLANT/WATER LEAKS FRONT BOTTOM PASSENGER SIDE. CAR WILL GET HOT IN STOP AND GO TRAFFIC. BUT WILL STAY IN THE MIDDLE TEMP WHEN ON FWY OR STRAIGHT ROAD WITH OUT STOP.


If you are seeing coolant leaking from your car, then you have a leak. It could be the radiator, a hose, or the heater core. The other possibility is that if you are using straight water instead of water/antifreeze mix, then the water is boiling and overflowing the reservoir. I will assume this is not the case.

The car does not overheat at cruising speeds because there is enough air and coolant flow through the system to keep the engine temperature under control. When you stop and go, you lose the air flow. Check also if your cooling fan is running when the engine is warm and the car is stopped with the AC off. You should be able to hear it from beside the car.

You need to find the leak and repair it. This is a simple task. Simply get a flashlight and look for source of the green coolant. Once you have determined the source, you know which part to replace.

May 16, 2010 | 1996 Mercury Mystique

2 Answers

My antifreeze is leaking out of my radiator .....HELP : (


adding antifreeze on its own can be bad for your motor.. it needs to be added with water.. does it leak from your radiator cap/ overflow hose or from the radiator core.. ckeck you thermostat as well. it stays closed when the water is cold and opens when it gets hot.. it sounds like it could be stuck shut..

Feb 25, 2010 | 2002 Pontiac Firebird

2 Answers

Engine coolant indicator


make sure that your fans are working first. to do this. start veh and let idle until it warms up. but if it starts to get hot and fans do not turn on, check fuses. if they work then look for leaks.

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