Is there some way to drain coolant completely from the block ?

No drains on the Series 1. Whatcha up to?

Not up to anything.
It'* been 5 years now and I want to do a complete drain and flush.

Every year I drain the rad completely and refill with fresh coolant mix but that only replaces about 1 gallon or about 1/2 the total amount.

How do you do it Bill ?

I use the overall capacity to calculate my mix for the fill, but I start by disconnecting at the lower radiator hose, stuffing a garden hose in that with a rag for a gasket, and then fire it up. Of course, you have to have the stat out to get flow, but hook up your upper hose again with the stat out. Last time I did this I was changing the stat anyway. After everything starts coming out clean, I allow the rad to drain back down before hooking up the lower hose again. That leaves enough empty capacity in the rad for the coolant.

If I had to do it again, though, I'd probably take it in and have it professionally done. It'* much cheaper than a trans flush.

I don't like taking my cars in to have any work done on them unless absolutely necessary.
I still have nightmares about the one time I took my old International Scout in for a Trani oil change. When I picked it up, I noticed a brazed hole in the bottom of the oil pan. They had punched it with an awl to drain the fluid.

Come on Bill, that'* one of the reasons we have this forum, to do our own work, play and learn.
Changing fluids like coolant should be a basic job.

So if there isn't a block drain plug....like there is on my Firebird....I suppose that I'll go the same route of most "professional" shops, garden hose stuffed with a rag.

It actually works really well. The first car I ever did this to was my 88 Camaro. I've been doing it ever since. The only pita is the stat, but if you're patient, you can just run it and wait for the stat to cycle it out as each 'fresh charge' of water gets up to temp. You and I have drilled stats now, so it might not take as long.

You just have to know the total capacity of the cooling system, and that of the radiator in order to get your mix right later. And don't forget to have your climate control in full heat, so you get the snot out of the heater core, too.

My cooling system capacity is 9.5 liters or 10 quarts, so a 50/50 mix would equate to 4.75 L or 5 quarts of Dex.

If anyone is interested, I just found out from 3800Tech forum.

That explains the difference. Series 1 only has one KS. So we can't drain from both sides.

It'* all well and good until you look and see how difficult it is to access those suckers to remove them.