2004 Glastron GX205 w/ Volvo Penta 5.0 Overheating

[Almanza1]

Recently changed the impeller and thermostat but boat still running hot after 10-15 of use. I slow down or idle for a few minutes and the temperature starts to go down. I’m able to continue after temp goes down but once again after 10+ minutes temperature begins to creep back above 200. I’m going to change the temperature sender to see if it’s a faulty sensor but would love opinions on what else it may be? Thanks

 

[Scott06]

Recently changed the impeller and thermostat but boat still running hot after 10-15 of use. I slow down or idle for a few minutes and the temperature starts to go down. I’m able to continue after temp goes down but once again after 10+ minutes temperature begins to creep back above 200. I’m going to change the temperature sender to see if it’s a faulty sensor but would love opinions on what else it may be? Thanks

Is this a salt water boat, would check the exhaust manifolds risers if used and elbows fir corrosion and restricted water passages

 

[Almanza1]

Is this a salt water boat, would check the exhaust manifolds risers if used and elbows fir corrosion and restricted water passages

Was recently purchased but as far as i was told was never in salt water. Currently in Arizona

 

[Bondo]

Ayuh,..... Welcome Aboard,....... I'd investigate the plumbing from the outdrive to the raw water pump,....
If there's a leak there, it'll be suckin' air while on-plane, 'n water when not on-plane,....

 

[Horigan]

Also, get an IR gun for $30 and verify the temps at the thermostat. It’s a great tool to have for diagnosing temp issues.
The sensor is likely accurate.

 

[Almanza1]

I appreciate everyone’s response. I’ll be taking it to a mechanic this week. If you have any other ideas don’t hesitate to respond. Thx again!