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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  • 94 Answers

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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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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93 GMC Safari overheating. This happened spontaneously. Runs hot very quickly when I drive it. There is antifreeze in both radiator and overflow res, overflow res fills up more after driving a bit. ...


It would appear your thermostat is stuck in the closed position , find where it is on your engine, drain coolant and remove thermostat housing and stat, replace housing(liquid gasket OK) and coolant. now run engine, turn heater controls to hot leaving filler cap off, top up any water to max and replace cap now warm up to temp until fan comes on. if all ok replace thermostat with a new one and new gasket, you could also flush the sytem out at the same time with a hose pipe by loosening one of coolent pipes and flush radiator.

Nov 04, 2013 | 1993 GMC Safari

1 Answer

My 2002 Oldsmobile Silhouette keeps overheating. We replaced the thermostat and flushed the system by adding new antifreeze. The air blows cold from the heater when the car starts to overheat. Once


there can be air pocket somewhere you need to bleed system properly. rais the front let is idle bleed it thru bleeding screw. be sure that bubbles are over.

air pockets prevent coolant travel inside system. so it may not reach to radiator, or cabin heater or both.

Nov 19, 2011 | 2002 Oldsmobile Silhouette

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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

1 Answer

Van produces no heat from the heater, engine heats up when driven short distances. Thermostat was replaced, still no heat. coolant level is fine.


Two things are possible. Air in the cooling system, or the system needs to be flushed. You didn't say what year your van is, but I'm sure it use dexcool antifreeze. Dexcool is the orange antifreeze recommended by GM for all their vehicles. The problem is that dex cool attacks gaskets causing gasket failures, especially the intake gaskets. It also can cause buildup in the cooling system causing overheating, or plugging up heater cores. We'll try the easy solution first.We need to get the air out of the system. First, the radiator needs to be higher than the engine. If it isn't, either use drive on ramps or raise the front end with a jack, Remove the radiator cap, put the heater controls on hottest setting, start the engine and let it run. When the coolant gets hot enough, the thermostat should open allowing the coolant to circulate. When it opens, the coolant level will drop in the radiator. Add antifreeze to make it full again. The coolant will drop again and may do so several times. Just keep adding antifreeze each time. continue to do this until the coolant level stabilizes. If the thermostat closes momentarily it will cause coolant to overflow. Not to worry, wait til it opens again and top off the antifreeze. Put the cap back on the radiator and check the heater for heat. If it' still not warm, you may have to flush the radiator.

Jan 05, 2011 | Pontiac Montana Cars & Trucks

1 Answer

Antifreeze/water leaking . puddle underneath van already got new thermostat, radiator is full overflow box full. can't see where leak is coming from. either from below or above view is blocked by other...


May not be either. Does the van run hot? If it doesn't then the coolant when it is heated is going to the overflow reservoir and if that fills up then out the overflow line to the driveway or the garage floor but everything is O.K.

Sep 13, 2010 | 2000 Dodge Caravan

3 Answers

I FILLED THE COOLANT SYSTEM AND BECAUSE THE WATER PUMP OUT LET SITS HIGHER THAN THE RADIATOR I HAVE A ARI LOCK. HOW CAN I VENT THIS ARI OFF?


Hello ,this is what i do for this vehicle .First take off one of the heater hoses going to the top of the water pump.Next make sure the radiator cap is ON .Then take a funnel ,stick it in the waterpump tube .Then poor the antifreeze in slowly until antifreeze comes out of the hose that was taken off .this will put antifreeze into the engine and radiator.:)

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There is antifreeze odor when AC comes on and has not been running hot until today. The engine idles rough and cuts off when backing up before this happened and the brake and ABS light comes on also. Where...


it sounds like the heater core. look for a wet floor board on passenger side. in the meantime, keep your overflow bottle full & climate controls off when driving van in this condition untill fix.

Jul 18, 2009 | 2002 Ford Windstar Cargo

2 Answers

I have a 1994 Plymouth Grand Voyager. I replaced the thermostat 2 weeks ago, and now the heater valve but I don't know how to bleed the antifreeze so the air can come out. How do you do this on this van?...


Hi there... with the radiator cap off, start the van and let it warm up. Once the thermostat opens you will see the coolant start to circulate in the rad. let it run for 10 - 15 minutes and add more coolant as needed. you will know when there is no more air because the coolant leve, won't go down anymore. Top up the rad and put the cap back on. make sure the overflow resevoir has coolant in it to the full mark and youre done. Hope this helps you out

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