: Critique my coolant flush method



Avaya
05-09-14, 05:27 PM
I need to do a good flush on my 2001 Deville DTS.

After studying the flow charts:

Remove the upper and lower hoses from the radiator
Remove the thermostat and replace the cover.
Run hose water into the lower hose until the water coming out of the upper hose is clear

It will be messy, but that is the best way I can figure to try and flush all parts.

I've done the fill, heat, drain, repeat, 3 times and it still doesn't run clear.

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Of course flush the radiator too, independant of the rest, just use top hose

basscatt
05-09-14, 06:33 PM
I need to do a good flush on my 2001 Deville DTS.

After studying the flow charts:

Remove the upper and lower hoses from the radiator
Remove the thermostat and replace the cover.
Run hose water into the lower hose until the water coming out of the upper hose is clear

It will be messy, but that is the best way I can figure to try and flush all parts.

I've done the fill, heat, drain, repeat, 3 times and it still doesn't run clear.

----------

Of course flush the radiator too, independant of the rest, just use top hose
================================
LOTS of unnecessary steps -

a simple coolant exchange is really all you need to do -
UNLESS you have a problem with a clogged heater core or radiator -

due to the nature of the cooling system -
you will NEVER completely drain it -

Avaya
05-09-14, 08:57 PM
Yeah I know, I've "exchanged" three times and still have junk coming out. Wanted a more thorough and hopefully less time consuming method.

Ranger
05-09-14, 09:07 PM
That "gunk" is the Barsleaks sealant tab residue that GM used to use. Any residual left in the system really shouldn't hurt.

Considering you never get all the coolant out, I think the best way is to drain it from the lowest point in the system and that is the radiator drain plug. That's how I do it (for what little that's worth).