Thermostat Swap Question
 

While installing a new thermostat does the radiator need to be drained completely?

If not then how much should it be drained.

Thanks.

,Nick

you can drain it enough so that you can take the top rad hose off the radiator without coolant pouring out, like 3 inches give or take. once you remove the thermostat your going to loose some more coolant anyway since it should be closed and when you remove it, itll basically equal the pressure inside the motor and some excess will pour out. plus some will stay in the upper hose when you remove it, itll be a little messy but not too bad.

nah...u dont have to, since only a little bit of coolant is lost...i did though cause i follwed it with a complete system flush...but its not really necessary...and its so damn easy to do!!!

Thanks for the input guys.

I'm assuming my SES Light is going to go on once its in. Did it for you guys?

that usually depends on the temperature of the t-stat...160's are known to throw a code in grand prix's, not sure if they do in fbodies too

no code here...