Best way to drain out all coolant?


Forscythe87
02-26-2008, 09:45 PM
I followed instructions as per the Haynes Lumina manual and opened up the radiator petcock. I was able to drain about 3/4 gallon of coolant. I ran water through and it came out fine and clean.

I know theres about another 3/4 of a gallon in there and im not sure how to get it out. The person that had my car before me obviously neglected the dexcool. I did a partial flush (drain, pour water till clear water, add and run with water). It was still coming out ORANGE even after flushing a couple times. Obviously opening the drain valve doesnt get it all out.

Ive also been told not to use flush chemicals. Not sure if this is accurate or not.


Suggestions?

Also thanks for all your replies in previous threads. I have resolved all but this issue with my car and couldnt have done it without your help and suggestions.

jeffcoslacker
02-27-2008, 06:59 AM
Get a cheap flush and fill kit and put the tee in it....have the motor running and the heater on while flushing...

http://veautomotive.com/img/502f423030304343465935572e30312d413249473657505358 53503055592e5f53434d5a5a5a5a5a5a5a5f.jpg

No don't use chemicals...

Bleed the system properly when done.

j cAT
02-27-2008, 06:54 PM
Get a cheap flush and fill kit and put the tee in it....have the motor running and the heater on while flushing...

http://veautomotive.com/img/502f423030304343465935572e30312d413249473657505358 53503055592e5f53434d5a5a5a5a5a5a5a5f.jpg

No don't use chemicals...

Bleed the system properly when done.

I don't see anything wrong with using an acid flush for a contaminated system as this is the only way to remove the sludge..... If you ignore the instructions you may have problems.. I have used this type of chemical flush many years ago when dexcool was not created and mineral deposits would build up on radiator tubes restricting flow.....also when flushing remove thermostat this will get the flushing a better result....your system has most likely 3.5gallons of coolant in it.... so make sure you put 2gallons of antifreeze.....make sure you flush heater core hoses seperately after engine flush to ensure that this core is not restricted....only use dexcool with the patent GM number on it do not use universal antifreeze.... and make sure repairers do not add to your coolant anything or you will end up with sludge as any small amount of non dexcool will cause sludge quickly..the acid will remove the oxidation this then will aid in coolant removing the heat more efficiently........the neutralizer baking soda will get the P.H. back to neutral 7.0 and then your ready for refill....

jeffcoslacker
02-27-2008, 07:10 PM
The 3.1 Lumina's cooling system capacity is 1.6 gallons...

I'd just as soon avoid caustic cleaners if there was no problem beforehand...but that's just me..

j cAT
02-27-2008, 07:21 PM
The 3.1 Lumina's cooling system capacity is 1.6 gallons...

I'd just as soon avoid caustic cleaners if there was no problem beforehand...but that's just me..

I also agree with that ! but he stated that the prior owner neglected the coolant so that is why this may be necessary to use the acid ....dexcool with distilled water should not cause any sludge.. its when some one uses non dexcool the problems of overheating do to clogged coolant system....I use texaco dexcool only and since 1996 i have had no problems with sludge or coolant getting cloudy.. r/r coolant 5yrs... are you sure the 3.1 only uses 1.6gallons.... the 3.8 is 3.5gallons this is the heater core included, the heater core takes 1/2 gallon just itself.....

Bearwulf
02-27-2008, 08:30 PM
What about the block drain on the rear of the engine for draining coolant as well as rad. petcoc?
On center, short ways above oil pan.

jeffcoslacker
02-28-2008, 07:20 AM
... are you sure the 3.1 only uses 1.6gallons.... the 3.8 is 3.5gallons this is the heater core included, the heater core takes 1/2 gallon just itself.....

I admit it sounds pretty small, but that's the stated spec...unless someone goofed and that's just the radiator capacity, but I've never been able to get a full 2 gallons in one even after having all the hoses off, etc, so I assume it may be correct.

wafrederick
02-28-2008, 06:46 PM
It is a messy job draining the block and I have done it this way.This is one draining the coolant also.

j cAT
03-01-2008, 04:30 PM
I also agree with that ! but he stated that the prior owner neglected the coolant so that is why this may be necessary to use the acid ....dexcool with distilled water should not cause any sludge.. its when some one uses non dexcool the problems of overheating do to clogged coolant system....I use texaco dexcool only and since 1996 i have had no problems with sludge or coolant getting cloudy.. r/r coolant 5yrs... are you sure the 3.1 only uses 1.6gallons.... the 3.8 is 3.5gallons this is the heater core included, the heater core takes 1/2 gallon just itself.....


I was looking into the coolant capacity of this and other vehicles at auto zone and it appears that the listed coolant capacities are only for draining radiator at drain on radiator... let me assure you that the total capacity of coolant system is much higher than this amount... I have an example....96 impala auto zone lists 1 3/4gal of coolant fact total system including the heater core is 4.2 gallons.... this I have done 3x since 1995 when I first purchased..... so when you compute the proper antifreeze mixture you had better know the total capacity especially if you flush your system as now you will have an engine and heater core full of water ........this may be why owners suffer coolant cloggs.....and other coolant failures.......98 monte carlo 3.8L total capacity is 3.5gal...of coolant..

LastBet4U
03-29-2008, 09:21 PM
I just went through this a few weeks ago and it is 11.6 Qts for the 3.1 engine.

savannaz34
03-30-2008, 02:41 AM
ummmm...................did you ever think of getting the car warm first?
then draining it

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