bottom drivers side of rad

 

Look straight down from the upper radiator hose-- you'll see a plastic tab sticking out down at the bottom. That's the valve. The nipple you connect the tubing to is on the bottom of that. I think what I used was 3/8" ID tubing but I'm not 100% on that.

 

the drain plug works kind of weird. you unscrew it a half round or so, and then pull out about 3/4 inch.
the block drain plugs are on each side of the engine, tucked in behind the motor mounts. be careful with them, they'll round off easy. mine wanted to round off, so i clamped a good pair of vice grips on them, then put a short pipe over the end for more leverage. that worked. when re-installing, use some rtv or teflon and do not overtighten. snug is good enough.

 

The radiator drain is on the bottom left side. The engine block plugs are under the exhaust headers.

 

Well I'll be darned...I had the same problem it would not drain that is how i came to this thread....I will try to pull it out tomorrow.

 

Just pull the lower hose with the engine running and the radiator cap off. Flush it out by: reattaching hose, filling radiator, wait for thermostat to open, pull lower hose, and repeat.

 

our motors have block drain valves? never knew that. also never looked. lol i just remove lower hose, drain rad, flush with water hose, attach lower hose & fill rad, start truck for 10 mins, drain again then top off 50/50 with anti-freeze and water

 

Not valves... but, 'plugs' you can remove at the bottom of the water jackets on each side of the block. Well, at least, according to popular theory you can remove them.... in actual practice, not so easy......

 

I'm glad I read this! I figured mine was clogged. I twisted it and it stopped at about a half turn. I was pretty sure it would have broken if I turned harded. I didn't think to give it a pull. And... drain plugs on the block? I didn't know that either.

You guys are teaching me gobs of stuff about this truck. You are saving me lots of $$$. (And... No, I'm not sending you your cut of my savings!)

 

This helped getting my drain plug out but now I can't get it back in. I am pushing/screwing in so hard I am worried I am going to break the plastic plug. I also even looking at the service manual can't find the drain plugs on the block =(