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View Full Version : What temp for thermostat to be open?


snobinge
10-27-2010, 04:41 PM
I have read that you need to make sure to heat up the engine to the point that the thermostat is open before you put in RV antifreeze for winterization. What temp does the engine need to be at for the thermostat to open?

DooSPX
10-27-2010, 04:47 PM
What engine? what boat? :confused::confused:

thatsmrmastercraft
10-27-2010, 04:48 PM
Depends on what temp. thermostat you have.

snobinge
10-27-2010, 05:01 PM
Boat is a 98' Prostar205 with the standard 5.7 310hp. I am the 2nd owner and am assuming it has the original thermostat.
Thanks for the help!!!

thatsmrmastercraft
10-27-2010, 05:45 PM
Not familiar with which temp stat goes in there, but a word of caution regarding what someone else may or may not have done. Some one will be by here soon enough with the proper temp stat.

Footin
10-27-2010, 05:50 PM
Boat is a 98' Prostar205 with the standard 5.7 310hp. I am the 2nd owner and am assuming it has the original thermostat.
Thanks for the help!!!

My 94 TBI 350 has a 160 degree stat so I would ASSUME it would start to open at 160 degrees.

cbryan70
10-27-2010, 05:51 PM
wouldnt the thermostat open to keep the motor at a certain temp? my motor goes up to about 150 then stays there so i would assume that would be about where the thermostat would open? this is what i have done the past 4 years and have not had any issues

gimmemoedmb
11-13-2010, 11:11 PM
Just pull the thermostat and then it doesn't matter what temp it opens at and you don't have to worry about whether it was open or not. You will need a new t-stat gasket but the $3-5 that costs is well worth it...

Chicago190
11-14-2010, 05:58 PM
Just pull the thermostat and then it doesn't matter what temp it opens at and you don't have to worry about whether it was open or not. You will need a new t-stat gasket but the $3-5 that costs is well worth it...

I agree the smartest thing to do is take the thermostat out. I've re-used the gasket in mine for 2 years without any leaks. I've also had success cutting my own with a generic roll of gasket paper from the hardware store.