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Water being pushed back in to expansion tank on my w reg ecort 75 van

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If you are really lucky try taking out the thermostat and run the engine.

If you still have bubbles then either the radiator is blocked or your head gasket has gone

Stick your hand across the outlet of the exhaust and your hand may get wet becasue the gasket is leaking through into the exhaust

If not then:

Take out the plugs one and turn the engine over no doubt you will get water coming back up one or more of the plug holes.

Head off, skim, check for cracks, new head gasket and several hours work putting it back

The joys of motoring !!!

Posted on Jun 28, 2009


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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

1 Answer

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.



May 07, 2014 | 1990 BMW 525i

1 Answer

2004 bmw 325ci water leaking under expansion tank

remove the expansion tank and have a look at the seams those tanks have a habit of distorting and start leaking

Feb 07, 2013 | 2004 BMW 325i

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

My engine ran low on water and subsequently overheated, since re-filling the water, it now continues to overheat. in a best case senario, i'm hoping it's an air block, can you tell me where the bleed...

If your coolant level dropped you have a leak in the system. Just adding coolant will not solve the problem, as it will continue to overheat. You should have a pressure test done to determine where the leak is. To bleed the system you have to slide back the hose going onto the heater core. At the back of the engine you will see two hoses going thru the fire wall. The hose on the left has a hole in it. Loosen the clamp ,slide the hose back . Add coolant to the system until it flows freely from the hole.Push hose back onto pipe ,tighten the clamp. Start the engine and turn on heater controls to high and run engine until normal operating temp is reached. Stop engine and check coolant level in the expansion tank and add if necessary.

Jan 17, 2011 | 1996 Audi A4

1 Answer

Putting water in a mini

From the top of the radiator (which is on the right hand side of the engine) beside the pressure cap there is a small hose pipe which leads to a plastic tank on the bulkhead.

This is called the expansion tank

On the side of the expansion tank is a level mark which shows how much water goes in there

If that is totally empty go back to the pressure cap on the radiator and unscrew it anti -clockwise (Only when the engine is cold and is not running).

Fill that up with cold water (Do you need anti-freeze in the water in your part of the world?)

Once that has been topped up replace the pressure cap making sure it is turned until it locks firmly then go back and fill up the expansion tank

Turn the engine on and let it run a while, water may escape from the expansion tank if you have over filled it.

If there are lots of bubbles and noises from the cooling system have it checked in case you have a leaky head gasket

Jun 12, 2009 | 2004 Mini Cooper

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

Porsche overheating & coolant loss through expansion tank

Check this out. Had the same problem. Easy fix. When you pull up at the lights does it blow steam everywhere as your water drips onto the exhaust. Next step is the water gets onto the coils engine light comes on and it mis fires!! Anyway solution. As it is doing it when you look at the bottom of the expansion tank you will see the water dripping. The tanks had a weakness and have I believe now been modified. Take it off and put your fingers over two of the three pipe holes, then blow down the other. Wifes often good at this!!! You will here a hissing as the tank has a pin hole in. It comes out fast as the pressure builds. To remove the tank undo the air box (1 x 10mm bolt and the screw on the large jubilee clip) Then undo the two petrol pipe bolts ensure your engine is cold. You should need a seventeen mm spanner. Then just under the engine lid you will see a 10mm nut which you need to undo. The box then slide forward toward the middle of the car and then back in a fastion!!! Give it a good blow you will see it. If you really must get in the bath with it and do it under the water.
Now get another and replace it.
Good luck everyone..... j 

Mar 12, 2009 | 1999 Porsche 911 Carrera

1 Answer

Porsche carrera 911 1999 3.6 overheating problem!!!

either the expansion tank is just cracked or there is a head gasket problem.

Mar 12, 2009 | 1999 Porsche 911 Carrera

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