Coolant change question

[rickp]

Hey guys,

I'm due to flush and replace the coolant on my 02 Tahoe LT 5.3L.

 

In the manual it says to remove the cylinder block plugs and drain the coolant. Here's my question, I've looked all over the bottom of that engine and I can't find any cylinder plug. Could it be possible that my truck doesn't have them. As per the book there's supposed to be 2 of them, one on each side.

 

If I dont' have them, what i was planning on doing to flush the system was to drain the radiator by the drain plug, then disconnect the main radiator hose, stick the water hose in the radiator turn the water and engine on, put the heater on high and let everything flush out. Am I on track here?

 

Thanks guys.

R.

[8.1HD/ALLISON]

I would pull hose and flush with garden hose, but I wouldn't run the engine . Drain, flush, refill and test freeze point. You should be good.

[c4cruiser]

Knock sensors are typically screwed into the block drain plug holes. Some motors will only have one knock sensor, others will have two. Remove the knock sensors, and coolant will drain out (along with the gunk that has been sitting for years at the bottom of the block cooling passages).

[TJay74]

Knock sensors are typically screwed into the block drain plug holes. Some motors will only have one knock sensor, others will have two. Remove the knock sensors, and coolant will drain out (along with the gunk that has been sitting for years at the bottom of the block cooling passages).

 

 

Knock sensors on the LS motors are under the intake, mounted inside of recessed holes in the intake valley pan. They are not mounted on the side of the engine.

[rickp]

I just repalced the nock sensors, they are on top of the engine under the IM.