Help! ST Anti-freeze leak!

Sourmash · 11-02-10, 09:40

My upper left radiator hose, (right above Cam Cover) has a metal plug screwed into the hose itself, this is seeping coolant.

Before I try to remove plug and reseal, I would like to ask if anyone else had this problem and how you fixed it?

Any help appreciated. Thanks

jcp · 11-02-10, 13:44

Sounds like the bleed screw-I would tighten it by hand and see if that helps. It will allow coolant to escape if you undo it and you would then need to refill and bleed the system-if it is under warranty I would let the dealer handle it simply for warranty reasons.

MacBandit · 11-03-10, 02:09

That's the bleed screw and it has an o-ring on it. I'd just make sure it's tight first. If it is and it still leaks you'll need a new o-ring.

Sourmash · 11-05-10, 17:48

Thanks for the info, especiately the O-Ring, about which I had no clue.

Tightened plug-screw 1/2 turn and added 9 oz. antifreeze mix, when weather allows will see if that took care of the leak. Plug wasn't real tight, so here's hoping.

MacBandit · 11-05-10, 22:30

That was probably it as they need to be fairly tight.

jcp · 11-06-10, 04:18

9oz sounds like a lot-if you have filled to the max when cold you will very likely see the motor chuck quite a bit out of the overflow when you warm the engine up. I think they need to register near the minimum mark when cold.

MacBandit · 11-06-10, 11:19

Yes the minimum mark is the full mark when cold if you top up when hot fill to the high mark. On many vehicles they use to mark these as cold and hot.

Phantom · 11-06-10, 13:25

Mine leaked but from a different spot. Went out and bought a 6mm socket - works better than an open end wrench.

vintagespeed · 11-14-12, 11:56

i've had my '12 STR on the rear stand for a few days while i sorted out a new rear tire for it. and it's been slowly leaking coolant. doesn't leak at all on the side stand and i didn't notice a difference in coolant level in the reservoir.

traced the leak up to the bleed screw in the upper hose, will give it a snug & see how that goes.

just wanted to let the '12 owners know this is still a possible issue.

RoxyStriple · 11-16-12, 03:35

Never a coolant leak but I did have my hoses discolor yellow . That's about it .
A set of Samcos make it proper and pretty but later caused a gasket leak for the idiots that installed them but that's a whole other matter . I love the Samcos though. The originals were just cheap.

11-02-10, 09:40	#1
Sourmash Junior Member Join Date: May 2007 Location: East Tennessee Posts: 91	Help! ST Anti-freeze leak! My upper left radiator hose, (right above Cam Cover) has a metal plug screwed into the hose itself, this is seeping coolant. Before I try to remove plug and reseal, I would like to ask if anyone else had this problem and how you fixed it? Any help appreciated. Thanks
Status: Offline

11-02-10, 13:44	#2
jcp Member Join Date: Feb 2010 Location: St Albans UK Posts: 397	Sounds like the bleed screw-I would tighten it by hand and see if that helps. It will allow coolant to escape if you undo it and you would then need to refill and bleed the system-if it is under warranty I would let the dealer handle it simply for warranty reasons.
Status: Offline

11-03-10, 02:09	#3
MacBandit Senior Member Join Date: Sep 2008 Location: Seattle Posts: 7,650	That's the bleed screw and it has an o-ring on it. I'd just make sure it's tight first. If it is and it still leaks you'll need a new o-ring.
Status: Offline

11-05-10, 17:48	#4
Sourmash Junior Member Join Date: May 2007 Location: East Tennessee Posts: 91	Thanks for the info, especiately the O-Ring, about which I had no clue. Tightened plug-screw 1/2 turn and added 9 oz. antifreeze mix, when weather allows will see if that took care of the leak. Plug wasn't real tight, so here's hoping.
Status: Offline

11-05-10, 22:30	#5
MacBandit Senior Member Join Date: Sep 2008 Location: Seattle Posts: 7,650	That was probably it as they need to be fairly tight.
Status: Offline

11-06-10, 04:18	#6
jcp Member Join Date: Feb 2010 Location: St Albans UK Posts: 397	9oz sounds like a lot-if you have filled to the max when cold you will very likely see the motor chuck quite a bit out of the overflow when you warm the engine up. I think they need to register near the minimum mark when cold.
Status: Offline

11-06-10, 11:19	#7
MacBandit Senior Member Join Date: Sep 2008 Location: Seattle Posts: 7,650	Yes the minimum mark is the full mark when cold if you top up when hot fill to the high mark. On many vehicles they use to mark these as cold and hot.
Status: Offline

11-06-10, 13:25	#8
Phantom Member Join Date: Feb 2010 Location: New York Posts: 238	Coolant Mine leaked but from a different spot. Went out and bought a 6mm socket - works better than an open end wrench.
Status: Offline

11-14-12, 11:56	#9
vintagespeed Member Join Date: Aug 2012 Location: Rancho Cucamonger Posts: 333	resurrection thread i've had my '12 STR on the rear stand for a few days while i sorted out a new rear tire for it. and it's been slowly leaking coolant. doesn't leak at all on the side stand and i didn't notice a difference in coolant level in the reservoir. traced the leak up to the bleed screw in the upper hose, will give it a snug & see how that goes. just wanted to let the '12 owners know this is still a possible issue.
Status: Offline

11-16-12, 03:35	#10
RoxyStriple Junior Member Join Date: Jul 2012 Location: Redlands CA Posts: 96	Never a coolant leak but I did have my hoses discolor yellow . That's about it . A set of Samcos make it proper and pretty but later caused a gasket leak for the idiots that installed them but that's a whole other matter . I love the Samcos though. The originals were just cheap.
Status: Offline

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