GTS Coolant Leak
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2017 Vespa GTS 300ie
Joined: 14 Dec 2019
Posts: 34
Location: Canton, MI
Sun Mar 14, 2021 10:58 am quote
Just finished an oil change and checked the coolant as well. The coolant was a little low, so I topped it off. This morning I noticed a small pooling of coolant on the garage floor. It’s definitely coolant. I have attached a picture that I’m hoping might help in identifying the issue. Looks like a gasket to me. There is some pink fluid on the motor housing just left of the intake manifold sensor. Any ideas would be greatly appreciated.


Gts 300 notte
Joined: 27 May 2020
Posts: 102
Location: Toronto
Sun Mar 14, 2021 3:59 pm quote
i had a similar weird issue. i noticed my coolant was low one day, so i topped mine off, the next day i see a little pooling on the feet plate (where your feet sit), opened up the coolant panel and there was droplets and slight splashing pooling on the white coolant container.. i thought oh shit i must have not put cap on tight enough.

fast forward to when i went to the dealership at a later date for something else, and i asked him to look at the cap.. he told me that the caps are made to allow some coolant to be released if it was too full or something...thought that was weird but ok..

havent had an issue since....
2015 Vespa GTS300 Super
Joined: 26 Sep 2017
Posts: 550
Location: Connecticut
Sun Mar 14, 2021 4:11 pm quote
Is it coming from the weep hole under the mechanical seal? Like in this pic? Or elsewhere?


2012 GTS 300 Super (Charlene) 1832cc cruiser (The Lambo)
Joined: 16 Dec 2020
Posts: 107
Location: Tigard, OR
Sun Mar 14, 2021 4:34 pm quote
Shouldn’t that “weep hole” fitting have a tube on it?
Veni, Vidi, Posti
2007 LX150 2015 GTS 2013 BV 350
Joined: 13 Sep 2012
Posts: 9743
Location: Fond du Lac, Wisconsin
Sun Mar 14, 2021 4:45 pm quote
PapaWheelie wrote:
Shouldn’t that “weep hole” fitting have a tube on it?
Nope. Not mine anyway....
Vespa Supertech 2019 (EURO3/APAC)
Joined: 17 Nov 2020
Posts: 165
Location: Australia
Sun Mar 14, 2021 5:07 pm quote
had a leak on my bike after 6 months of riding (not a drop before).

using lots of paper towel to dry things and then leave a piece in a suspect place (and wait a couple of hours) I eventually tracked it to a host clamp (iirc the one off the top of the thermostat that leads to the front of the bike).
Joined: 14 Mar 2021
Posts: 3
Location: berlin
Sun Mar 14, 2021 10:11 pm quote
If the lid is too full or there is something, the lid is used to release some coolant
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 39463
Location: Pleasant Hill, CA
Mon Mar 15, 2021 9:22 am quote
The cap has a pressure release valve. If there's a head gasket gone, pushing combustion gases into the coolant, you'll discover how effective that release valve is!
2017 Vespa GTS 300ie
Joined: 14 Dec 2019
Posts: 34
Location: Canton, MI
Thu Apr 01, 2021 1:19 pm quote
Thanks everyone for your posts. I took my scoot in for service because I know this repair is beyond my skill set. I have a blown head gasket, which is what I feared. I’ll update with the cost of repairs. Gasket is cheap, labor...? I agree with Greasy. I can’t do it, so I’ll pay to get the job done properly by someone more skilled than me, with no complaints.
2017 Vespa GTS 300ie
Joined: 14 Dec 2019
Posts: 34
Location: Canton, MI
Mon Apr 05, 2021 9:45 am quote
I just received the estimate. With parts $650-$800, depending on a time range of 4-6 hours labor.
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