ok. tomorrow im going to drain coolant. always had shop do it before. but well im going to do it. i read the manual and it says to remove the radiator drain plug. and the plugs from the block? anyone have pictures of where the coolant drain plugs are?

 

Rad. plug is on the pass. side of the rad at the bottom. It's easier to remove if you take the grille out. Not sure on the block plug, I never new there was one, But you could take the coolant temp. sensor out of the block to drain the coolant.

 

that was technically my question. i have never heard of the plug on the block. but would 50/50 do alright for a coolant swap?.. i heard there could be problems because i couldnt get all of the water out of the system.?

 

I always use 50/50. I think of it this way. The coolant put in before was 50/50 so all the coolant you cant get out should still be 50/50.

 

well true. but wouldnt i be flushing out the old coolant with hose water?

 

Well, think of it this way: The 4.0 engine hold 12 quarts of coolant (add 2.3 for the recovery tank) after the flush, put in as much 50/50 mix as you can. if it's a bit less than 12 quarts, drain the difference between how much you put in and the 12 quart total, and fill it with straight coolant. BAM! A perfect 50/50 coolant mixture! cuz whatever the difference was, is how much straight water you had in there, so, by adding that same amount of straight coolant, you get a perfect mixture.

 

now thats the way to think things through.. thanks dude!

 

Oh right forgot about that. My bad.

 

there is actually 2 3/8" npt plugs one on the drivers side of the block IIRC, but youd have to remove int/exh manifolds to reach it, most likely wouldnt be visible then due to the crud on the block. Just a hint if you wanna flush it real good remove the old coolant and add a 50/50 mix of water and vinegar and run for a little while then drain, itll remove most of the rust and scale from the cooling system, depending on how new it is wouldnt be a bad idea to throw a new t-stat in.