Question about Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
OK, First let's get a couple things straight.
Make sure that the seals in the cap are not damaged. There are two seals, the first is an O-ring that will seal the tank neck just below the overflow hose. The other is a flat seal up in the top of the cap which seals against the top of the threaded area on the surge tank. (This is the one we need to give the most attention to in your case - if the O-Ring is bad it will most likely be dumping all your coolant out the overflow hose.)
If you are satisfied that the cap seals are in good conditon, (They SHOULD look brand new! ;) ) then take a look at the surge tank.
I have seen several plastic surge tanks with "flashing" from the moulding process left on the top edge where the cap seal is supposed to seal. If there is a ridge on the upper surface that you can feel with your fingernail, it is enough to cause a leak. This can be fixed using a block and some 220 grit sandpaper. Be careful not to sand too much and/or sand it to where the top ends up angled. You may want to follow this up with some 1000 grit sandpaper to smooth it out even better.
One final note:
Make sure your surge tank is not overfilled. If it is, it will dump antifreeze untill it reaches the proper level regardless of the condition of the cap and/or surge tank.
Posted on Nov 07, 2009
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