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Water coming out of lid of radiator expansion tank when hot.

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You're overheating dont drive it....cooling fans on? check that. If not do they come on with the a/c on? next is thermostat, resticted radiator

Posted on Nov 22, 2008

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1990 BMW 525i 2.5L engine overheats after rplaceing water pump, stermostat,fan clucth,radiator


There's trapped air in the cooling system.
  • You need to remove the bleeder screw on top of the radiator when adding water to the expansion tank.
  • With the engine running, pour water into the expansion tank till you see air go out through the bleeder screw's hole.
  • Just keep adding water until no more air bubbles come out then just put the screw back in place.
  • Then fill the expansion tank to it's normal level/line.

1990-bmw-525i-2-5l-engine-overheats-fibacwft50qlopemjcsdtpdf-4-0.jpg

1990-bmw-525i-2-5l-engine-overheats-fibacwft50qlopemjcsdtpdf-4-5.jpg

May 07, 2014 | 1990 BMW 525i

1 Answer

Water flowing out of radiator when idling 93 nissan terrano v6 petrol auto trans


If the coolant was hot when you noticed water coming out the radiator, that is normal from the heat expansion of the coolant. That is why there are coolant overflow tanks-also called coolant expansion tanks.
When refilling coolant, always top up the radiator, and fill the overflow tank to at least the cold mark level (about half-way up on the tank). With cap off, run engine till the thermostat opens- upper radiator hose will become hot-then shut off engine, add coolant to radiator as needed, replace cap. This method of filling will help to expel any trapped air in the system. Oh, and remember to set your heater controls on high when filling coolant, so the heater core and lines also circulate and expel air.
Check the seal on the radiator cap that it is still good. The cap seal is important to seal the coolant system, as it is a closed system under about 15 psi of pressure. The reason to pressurize the system is that the pressure will raise the boiling point of the coolant by about 10 degrees- important when you consider how hot the coolant has to be when running. OK, enough tutorial-I don't think you have a problem with the water pump! G'd luck, reeve.

Nov 22, 2012 | 1993 Nissan Pathfinder

2 Answers

Have changed the water pump, thermostat, radiator, radiator cap, all hoses. 2001 chevy venture, still running hot? How long does it take to bleed the cooling system?


If the system fills via an expansion tank, I would recommend removing the top hose from the radiator and filling the system by pouring the coolant in through the hose until it begins to flow out of the upper radiator port. Reconnect the hose and then fill the expansion tank. That should take care of it.

Jun 26, 2011 | 2001 Chevrolet Venture

1 Answer

2002 Dodge Stratus - I want to add water and antifreeze but when I try to turn the radiator cap, it turns but wont come off. Were do I add fluid?


The correct place to add engine coolant is the radiator's expansion tank. It should be a large tank under the hood with a cap that says "Coolant". The tanks will also have an Add and FULL level. Fill this tank when the engine has cooled to the FULL level. As for the radiator cap, it should come off when pressed down with hand pressure and at the same time turned in a counter clockwise rotation. DO NOT open the radiator cap when the engine is hot or at operating temperatures.

Aug 31, 2010 | 2002 Dodge Stratus

2 Answers

How do I change the coolant


Hi!!
On the bottom of the radiator, there is a drain valve, just open it and drain fluid into a container, if you want faster drain, remove bottom radiator hose.
NOTE: DO NOT OPEN SYSTEM WHEN HOT, COOLANT IS POISONOUS FOR PETS, KEEP IT AWAY FROM THEM.
Good Luck!! Rate this post!!

Aug 14, 2010 | 1996 Chevrolet Lumina Mini

1 Answer

How do i put coolant in a polo 1.4 year 2000


open radiator and fill the radiator. open expasion tank and fill it to the FULL mark.
start the engine with the radiator cap off. keep topping the radiator up as the air comes through the system and the level goes down. keep it FULL. top up the expansion tank if necessary back to the full mark, do not fill it to the top you will only get coolant all over your engine bay!
gently rev the engine for 20 seconds just to send the water round and get some air out of the system. top up both radiator and tank again if required. refit the radiator cap and expansion tank cap. go for short drive. check the levels again (be careful with the radiator cap since the coolant will be hot now!) - should be settled now.

ready for the road!

Jan 16, 2010 | Volkswagen Golf Cars & Trucks

1 Answer

Want to know if this sounds like head or head gasket problem


make sure you have 50 percent water and 50 percent antifreeze.hot wire fan to see if work.if not replace it.if works check fan relay.if car stills over heat check top radiator hose .should get warm in 10 minutes.if not replace thermostat. if a lot of white smoke come out of exhaust.after car warms up .suspect blowed head gasket.

Apr 15, 2009 | 1999 Volkswagen Golf

1 Answer

Water leak from top of expansion tank.2000 BMW 316i se


The water (coolant) in the expansion tank will rise and fall with the engine temperature. What the expansion tank does is collect and return coolant to and from the engine. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. The coolant then goes into the expansion tank. Now when the engine cools down the pressure drops in the cooling system and the pressure drop (vacuum) pulls the coolant back into the engine via the radiator cap. The radiator cap allows the cooling system to build up pressure and by doing so increases the boiling point of the coolant, but when that pressure exceeds the caps rating the cap opens and the coolant goes to the expansion valve. The cap has another part to it that when the engine cools down and a partial vacuum is created in the cooling system a "valve" in the radiator cap opens and allows the coolant to be drawn back into the engine. I would look at your radiator cap to see if any gunk or build up is on it, and check the rubber gaskets for cracks. It's easiest just to replace the cap because they are inexpensive and easy to replace (2-10 dollars). The expansion tank should have two hoses on it. The one on the bottom comes from the radiator and the one on the top (possibly part of filler cap) runs down and is open to the ground. That way if it is overfilled or becomes overfilled it will slowly leak onto the ground. When and if you change your radiator cap, make sure the engine is cooled down, remove cap and start engine and turn heater to full blast, full heat. Leave the cap off and let it run until engine warmed up. This should burp out any air pockets that may have happened when coolant was changed. Also top off the coolant in the radiator while it is running. Hope this helps and good luck

Apr 03, 2009 | 1992 BMW 3 Series

1 Answer

Coolant light


First check the coolant expansion tank and radiator for correct level. The radiator should be full (take the cap off when the engine is cold, doing this on a hot engine will cause hot coolant to spray out and possibly cause major burns). The expansion tank should be marked level-wise, either min-max, or min only, or max only. If the levels are right, your level sensor is probably bad. This sensor is located somewhere in the expansion tank.

Aug 17, 2008 | 2003 BMW 330

2 Answers

Volvo 1994 Radiator


hi my name is paul
these days most cars have a expansion tank under the bonnet or hood
this is were you fill it up with water it looks like a plastic bowl with a screw lid
DO NOT UNDER ANY CIRCUMSTANCES UNDO CAP WHEN ENGINE IS RUNNING OR IS STILL HOT *** DANGER OF SCALDING DO NOT OVERFILL CHECK OUT MAX LEVEL
car manufacturers use expansion tanks because as the water in your engine warms up it expands under high pressure and fills up the expansion tank with excess water when the engine cools down the water cools and it shrinks and goes back into the cooling system hope this information has been usefull
regard paul

Jul 11, 2008 | 1994 Volvo 940

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