I'm trying to figure out where the engine block plugs that drain coolant are located on my '03 Suburban.

Does anyone know if the coolant plug is the big bronze colored setscrew above the oil filter in the picture below, or is it the smaller silver colored screw below it in its 5 o'clock position?



There is another silver plug on the same side, but in the very front of the engine below the power steering reservoir.



All of these screws are extremely tight and hard to remove.

Thanks

 

the big bronze one is it. I have never been able to spot/identify the ones in front.

 

Thanks OmarR. I changed the coolant this afternoon. The bronze one was it. It took a 17mm allen wrench to loosen the screw, and dumped about 5 quarts of fluid after it was removed. I'm sure there is a block plug on the passenger side of the engine too, but just couldn't see, or find it due to the starter and all the other stuff on that side of the engine.

 

So that front drain under the PAS/tank is the high pressure oil run going to the filter... Ask me how I found out... 😉

****ing AI told me it was the one...

I'm looking for the passenger side.

The directions I had before described it. It's like a 7-8mm loooong boy up next to the starter or something?

I'm not wholly nilly pulling anymore drains I run Valvoline premium blue 5w40 and it's $36/*gal* so basically it's a hunnit bucks for two oil changes but I gotta spend 70 to do *one* and nobody stocks it regularly... Basically Id like to keep the damn oil in the engine lol. Not to mention blowing 2.5 quarts of hot oil out of a running engine is terrifying lol.

Anywho...

Little help? I had head gaskets go and I flushed out the oil and **** with dish liquid and sodium hydroxide/Caustic Soda degreaser **** I cooked up and now I'm flushing all that out and correcting the PH with dilute muriatic acid before I put G05 and Redline Diesel wetter in it with RO Alkaline water.

Got a racing radiator and I'm in the process of replacing all the plastics in the system also with aluminum, then next I'll get silicone lines, and then lastly the front and rear heater cores.

Then I'm doing dual 5kcfm fans with a 200amp roll in dual fan controller I'm trying to find.

I want to be able to do standing burnouts at redline in 117° ambient temps lol.

Or say... Tow an egg camper through the Rockies at 100mph constant lol...