How does one complety drain the coolent to put in the Prestone Dex Cool?

i dont think there is a way to completely drain the coolant without major work i used the dealers flush machine that'd be the best way to fix it up .

The Prestone (or other brands) Flush and FIll Kit will get rid of virtually all of it.

http://www.acehardware.com/product/i...d=1289874&cid=

You install it in the heater hose, connect a garden hose and flush the system that way

These work swell, and you don't have to cut the heater input hose, you can just disconnect it, add the flushing tee and add a short piece of hose to connect the tee to the engine. That way, when you are done flushing, you can remove the tee, and replace the heater hose as original. I like to start the engine and let it run for about 30 seconds at a time when I am reverse flushing to stir up the coolant in the corners. I keep doing this until the water runs clear when the engine is started.

If you haven't pulled the knock sensors, a lot of water will remain in the block and the heater core, so, in order to end up with a 50/50 mix, you will want to calculate how much pure coolant to add, and put that in first when filling.

I didn't notice earlier that you intend to put in Prestone Dex. If it were my car, after flushing the Dex, I would refill with "mixes with any type" coolant, never Dex. Dex can break down in your engine, clog passages, and damage gaskets.

Also, before you do the reverse flush with the garden hose and the radiator cap off, remove the thermostat from the engine. This will allow the coolant to be circulated through the entire system with the cold water from the garden hose. Periodically, say once every five minutes, starting the car and allowing it to run for 30 seconds will stir things up, but without a thermostat in there, I would not advise running any longer. If you let it run too long while pumping in cold water, you might creating too much of a temperature difference around the hot combustion chambers and end up cracking a head.

I think he means this stuff. Which really is great stuff, it has kept my car perfectly cool on the HOTTEST summer days IN TRAFFIC.


DEX Compatible. But doesn't have the destructive effects of Dex.

Could this just be prestone'* brand of DEX?

Why take a chance? Fill with the yellow/green stuff.

Moved to general as changing coolant can apply to all years, regardless of the reason why you wish to change it or with what kind...

They really do monitor these threads J/K Tracy

I have the Prestone Dex stuff in my 91 Suburban and I have not had any trouble with in in the heat or cold

The Prestone Dex compatible is just that. Compatible. This is the Prestone Long Life that Jr's3800 and I frequently suggest.