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Coolant overflow tank not draining
Posted 30 July 2013 - 06:50 PM
Posted 30 July 2013 - 07:11 PM
As long as the hose from the radiator to the overflow tank is not full of holes, one end is securely attached to the radiator nipple, and the other end is in coolant in the tank it is "vacuum tight" (ie. would normally draw coolant back in). The overflow tank itself is not air tight, and doesn't need to be.
Could you clarify why you mean by: "The car runs fine other than not draining so I have to empty it out manually after a long drive and top the system off."
I'm a bit confused. Is the overflow tank filled with coolant between the markings? I usually check when it's hot - upper line.
Edited by nickb21, 30 July 2013 - 07:14 PM.
Posted 30 July 2013 - 07:31 PM
Posted 30 July 2013 - 08:14 PM
Posted 31 July 2013 - 10:59 AM
make sure the hose going into the over flow bottle is not pressed against the bottom of the bottle.
in other words, pull the hose up, out, of the bottle about 1/2 inch.
see if that makes a difference.
other things that will cause your problem have been mentioned.
but maybe a bad cap could hold pressure in one direction but not in another.
or possibly a low pressure leak somewhere that seals at high pressure.
this sound really lame, but who knows?
Posted 31 July 2013 - 11:34 AM
One post I read, a replacement radiator needed to have the nipple that the o'flow hose fits on drilled out!
confirm that nipple isn't clogged or cracked, that the hose isn't split or have a hole, that the radiator cap is good, etc.
Do you ever see the upper or lower rad hose collapse?
Most people feel a Subaru cap is best. Certainly, the cooling system's thermosat MUST be OEM or OEM style.
Edited by 1 Lucky Texan, 31 July 2013 - 11:37 AM.
Posted 01 August 2013 - 01:58 AM
The hose going into the overflow must reach to about 1/2" from the bottom of the bottle, if its cracked or cut just a few inches into the bottle it can't suck up any coolant below that point.
Posted 01 August 2013 - 09:46 AM
Posted 01 August 2013 - 09:54 AM
Open the radiator cap and let the engine run up to normal operating temp. Top off coolant level in the radiator as necessary. Be sure to open the bleeder valve on the opposite side of the radiator if it has it.
Posted 01 August 2013 - 10:12 AM
i am not the most experienced so i do not know everything .
but, i have NEVER seen a subaru T-stat go bad.
i have heard of them being replaced as a preventative,
and i have heard of them being replaced for overheating,
and i have heard of issues related to after market replacements,
but usually in a situation like yours,
the t-stat is blamed for a problem caused by something else.
it gets replaced with an after market item and still the problem.
a subaru unit is installed, and still the problem.
i hope the subaru t-stat fixes it.
be sure to add the ''coolant conditioner''.
$2.50 from subaru.
this is very important.
i would add 2 bottles.
Edited by johnceggleston, 01 August 2013 - 10:15 AM.
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