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2000 vlx running hot

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Hey guys i need a little help with a problem i had today. We had been wakeboarding for about 30 mins when i happened to look down at the temp gauge. It was running about 200-220. Normally it runs around 160ish. When i slow down to an idle or around 5-10 MPH it goes right back down to normal temps but as soon as i take back off it goes up. I took out the impeller and it seems to be fine. What would be my next step to try?? Thanks.

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I'm not really familiar withe the v-drive water line routing, but this is the steps I would follow if on a dirct drive (also assuming a freshwater system):

If you have a shutoff valve in the water pickup line, is it fully open.

Take off hose between raw water pump & trans cooler and flush out to verify no debris.

Before re-installing previous hose, remove hose from othe end of trans cooler and verify no debris in cooler.

Remove inlet hose from raw water pump and check for debris at inlet side of pump.

Verify clear line from water pickup to water pump end of inlet hose.

Check for obstructions in thermostat housing.

Check for proper operation of thermostat. (Pan of heated water & thermometer, does thermostat open @ proper temp.)

Check hoses between thermostat housing and exhaust manifolds for obstructions.

Check for collapsed exhaust hoses.

There may be other components to check on a v-drive, I'm sure someone will cover if so.

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