'98 5.7L upper coolant drain

**PurdueGuy** · 08-08-2007, 06:17 PM

With much fighting, I managed to get the radiator drain valve open & drained the radiator. Went ahead & did two flushes (one with flush chemical, one with just water), and now I want to more fully drain the system before putting the fresh coolant/water combo in. Where is the upper coolant system plug located (assuming there is one...)?

(I'll be getting a Haynes/Chiltons manual next week, but I'm hoping someone can help me out sooner than that...)

**PurdueGuy** · 08-08-2007, 09:55 PM

Upon further research, apparently it's a block drain, but I still don't know where it is...

**GaryL** · 08-08-2007, 10:00 PM

There are plugs on the block to drain it, but be careful removing them, sometimes they are rusted in and will break off. You can remove the quick-connect on the passenger side of the intake and force water down that, but be careful removing the quick connect because it can break too and will be a PITA to replace. It might be just as easy and safe to remove the upper and lower radiator hoses and run a hose down the upper and let if flow out the lower for a while. Just a suggestion.

**PurdueGuy** · 08-14-2007, 03:30 PM

Originally Posted by GaryL

It might be just as easy and safe to remove the upper and lower radiator hoses and run a hose down the upper and let if flow out the lower for a while. Just a suggestion.

If I use this method, can anyone give me an approximation of how much water will be in the block, so I can account for that when I add coolant and get the right overall mixture?