91 ski nautique overheat?

[91skinautique]

I recently changed the impeller and thermostat (160deg) after the eng temp reached 200 deg. (I will change that impeller on a regular basis from now on) I flushed water through the trans. cooler and took the boat to the lake. The temp seems cooler than normal running at 145 idling around. When reaching speeds over 30 mph after a short period of time the temp creeps up just under 180. If I slow down the temp goes down until it around 145 again. What's up with that? Is it possible for the temp sensor to be faulty from being overheated? Any reason that the raw water pump would do this only at higher speeds? BTW I flushed water back down through the hull too.
The temp never seems to get to 180, but is setting off the alarm system.
Anyone know how much the temp sensor will cost me? Are there any on line places for parts or do I have to go through the dealership?

[surroundsound64]

Sounds like your impeller could be the wrong part#. Not real sure though.

[91skinautique]

Sounds like your impeller could be the wrong part#. Not real sure though.

Hmm. well here's the impeller kit #...9959k and thermostat #RP026002E
if that helps?

[skinautique]

your check engine light is coming on or not? Did you flush all of the lines from the impeller back down to the trans cooler? If you lost blades, chances are they are there. Check all of your hose connections as well.

The part numbers look right. I know for sure that the impeller # is right and I think the thermostat number is correct.

[91skinautique]

your check engine light is coming on or not? Did you flush all of the lines from the impeller back down to the trans cooler? If you lost blades, chances are they are there. Check all of your hose connections as well.

Yes, the light does come on. I flushed the lines with a garden hose already. Hoses are all tight......Oh I definitely lost blades....

[westlake17]

I was having the same problem a few years ago. Normal temperature at slower speeds (like trick/wakeboard speed) and overheated at slalom speed. After checking everything over and over again during a whole summer I found that air was leaking in at one of the hose barb connections on the rawwater filter/strainer. No water leaked out because it is on the sucktion side of the rawwater pump. A certain amount of vacuum was needed to draw the air in, thats why it didnt overheat at slow speeds. The cure was to tighten the hosebarbs one turn or two, to make them gas tight. (Might consider teflon tape or some sealer) Took me long time to find, might be worth checking! Good luck!

[skinautique]

did you get all of the blades out?
The light is on because you have a bad temp sensor switch or a bad oil pressure switch. Disconnect one of the switches and run the boat. If the light goes out, replace the switch that is disconnected. If the light is still on, stop the motor, reconnect the one switch and disconnect the other switch. The light should go off then.

[91skinautique]

I was having the same problem a few years ago. Normal temperature at slower speeds (like trick/wakeboard speed) and overheated at slalom speed. After checking everything over and over again during a whole summer I found that air was leaking in at one of the hose barb connections on the rawwater filter/strainer. No water leaked out because it is on the sucktion side of the rawwater pump. A certain amount of vacuum was needed to draw the air in, thats why it didnt overheat at slow speeds. The cure was to tighten the hosebarbs one turn or two, to make them gas tight. (Might consider teflon tape or some sealer) Took me long time to find, might be worth checking! Good luck!

Just wanted to give an update here. Westlake17 was correct. I found the clamp on the suction side of the pump needed tightening. Weird how there never was a water leak. Lesson learned. Thanks to everyone. Now I can get on with skiing.

[surroundsound64]

I was having the same problem a few years ago. Normal temperature at slower speeds (like trick/wakeboard speed) and overheated at slalom speed. After checking everything over and over again during a whole summer I found that air was leaking in at one of the hose barb connections on the rawwater filter/strainer. No water leaked out because it is on the sucktion side of the rawwater pump. A certain amount of vacuum was needed to draw the air in, thats why it didnt overheat at slow speeds. The cure was to tighten the hosebarbs one turn or two, to make them gas tight. (Might consider teflon tape or some sealer) Took me long time to find, might be worth checking! Good luck!

Just wanted to give an update here. Westlake17 was correct. I found the clamp on the suction side of the pump needed tightening. Weird how there never was a water leak. Lesson learned. Thanks to everyone. Now I can get on with skiing.

Awesome! Have fun!