Coolin issue on 9.9c

[mjc3276]

the motor is a 1985 Yammie/Mariner 682c 9.9c. I have change the impeller, housing, all gaskets, and checked tubes connecting the lower unit and in the lower unit. My motor is still not cooling. Its like a plug up or something. any advice on how to fix it??? I dont want to spend $700 to get it running.

Thank you.

MC

 

[99yam40]

what makes you think it is overheating?
If it is overheating, test the stat to see if it opens and closes in spec.
you can also test the temperature switches to see if they operate in spec.

Some have had some luck with using chemicals to clean out salt/mineral deposits the restrict water flow in cooling passages