It could be multiple problems. check your coolant level, it could also be your Lower intake gasket or even a head gasket.
The coolant level is low.The coolant level is low.
To check the coolant level of a vehicle first see look for the overflow reservoir. There should be a coolant dipstick with a level gauge on it. Remove it from the reservoir to see the coolant level.
Coolant Recovery Reservoir. There is no sensor in the coolant recovery tank on a 1998 Buick Regal.
It is located in the bottom of coolant bottle.
Either the coolant reservoir is low on coolant or the coolant level sensor is NG.
Coolant level low or level sensor malfunction.Coolant level low or level sensor malfunction.
Hold the bike level and check the coolant bottle behind the lower left fairing.
left side under the vehicle directly under the driver seat.
Check coolant level in coolant recovery tank and radiator
Not positive, but there is something attached to the bottom of the coolant tank, maybe that's it.
Check the coolant level. Check the thermostat.