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@rocketman avatar
UTC

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ET2,GT200
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Location: Adrian,MI
 
Enthusiast
@rocketman avatar
ET2,GT200
Joined: UTC
Posts: 93
Location: Adrian,MI
UTC quote
When filled to the proper level after riding at 55mph for a while my coolant gushes out behind the glovebox. When the level drops it does not. Perhaps unrelated my temp gauge will go into the red zone soon after starting and drop back to normal temp if I hit a bump or hit the temp gauge with my hand, any suggestions or common experiences?
@iangt200 avatar
UTC

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Vespa GT200
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Posts: 541
Location: UK
 
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@iangt200 avatar
Vespa GT200
Joined: UTC
Posts: 541
Location: UK
UTC quote
Perhaps loose / wet from coolant connection on the temp read / damaged temp sensor after your coolant loses.

Maybe the pipe attached to your coolant resevoir has a loose clip and when the coolants hot and the pressure is up it's squirting out until it's too low to continue.

It's pretty easy to remove the kick shield and ensure the pipe is on correctly. I had the pipe pop off completely but at the water pump immediately and as you'd expect the temp gauge went into the red.
@jimc avatar
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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Location: Pleasant Hill, CA
 
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@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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Posts: 44533
Location: Pleasant Hill, CA
UTC quote
You're going to have to take off the whole glovebox panel to investigate. If you're lucky it'll just be a loose hose clip that needs replacing - replace them all with Jubilee clips is best. It could also be a small split in the coolant reservoir itself - I've had to replace three on various bikes over the years.

While you're in there check the thermostat for proper operation (not too expensive to replace) and check the fan switch and fan work as intended.
@techenigma avatar
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2007 Vespa GT200 - 2010 Vespa GTS 300 Super - 2013 Piaggio BV 350
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@techenigma avatar
2007 Vespa GT200 - 2010 Vespa GTS 300 Super - 2013 Piaggio BV 350
Joined: UTC
Posts: 863
Location: Ventura County, CA
UTC quote
Same as JimC said could be the hose clamps, the coolant reservoir itself and those are both best case scenarios. A worst case scenario is it could possibly be a warped cylinder head, bad head gasket or a combination of both. I had a very similar coolant leak as you described and that was my source of issue.
OP
@rocketman avatar
UTC

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ET2,GT200
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Location: Adrian,MI
 
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ET2,GT200
Joined: UTC
Posts: 93
Location: Adrian,MI
UTC quote
If it is a warped head what had to be done?
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