On the way to work this morning my fan and check engine light turned on.
The temp was normal according to my gauge.
I let it cool down completely, started it, fan was on immediately for a minute with no CEL, stops and then after 10 minutes fan and CEL return.
It doesnt seem to be overheating, gauge only got to 2 bars.
Any insight on what may be happening here? I need to get home but not sure if its safe to ride...
2013 Vespa 300 Super, 2022 Kymco AK 550
Joined: 30 Mar 2014
Location: Minneapolis USA
Fan and Check Engine Lite
The Fan would indicate the engine is heating up.
I would be concerned about riding and causing
damage to what might be a cheap easy fix.
Coolant level could be low in the water pump
causing the Fan to run all the time. You should
be heating up. Fan with engine lite should make
you be cautious. Unless this is some crazy electrical
issue, you should be heating up. I would tow it
to the dealer.
Veni, Vidi, Posti
1975 Vespa GTR 125, 1976 Vespa V90 (Resto), 2001 Vespa ET4 125 (Sold), 2009 Vespa GTS300 Super
Joined: 05 Sep 2010
Location: Northants UK
Do a visual check of the cooling hoses, and check the small 'weep hole' at the bottom of the water pump for any drops of coolant. Check the coolant tank in the top right leg shield is full, and check the cap to see if there's anything unusual - it has a vent in it that needs to be ok.
If you've had major coolant loss, the coolant tank is dry etc, don't ride it - the engine can overheat and head gasket damage is likely.
You can remove the thermostat and check it's working in a hot pan of water - search here on MV or google it to find a 'how to'.
Let us know how you get on.
A connection has probably fallen off one of the temperature sensors. There are two, in one unit. One feeds the ECU (and switches on the fan if hot) the other just feeds the temperature gauge. Easy test - swap the two connections. If your temp gauge shows very hot, but the fan and CEL behave, then you have a bad sensor rather than a duff connection - but a duff connection is by far the more likely fault.
It *isn't* a thermostat fault, or a show-stopper problem.
Update: After letting the scooter sit for the weekend I put the thermostat back in, topped of the coolant and pulled the positive battery cable for 20 minutes.
Fired it up and used on and off since Monday (~200 miles) with no further issue.
I will chock this up to my less than stellar wiring/electronics as I have had some pretty weird electrical issues over the years.
2010 Vespa 300 GTS
Joined: 31 Aug 2020
Location: Kelseyville, California
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