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Old 09-01-2009, 10:29 PM   #1
jamestg6gt07
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How do i flush my cooling system?

I need to know how to flush/replace the fluid in my cooling system. I've done it once on an old honda, but i would like to know the right way and flush that Dex crap out and put some fresh 50/50 in.
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Old 09-23-2009, 05:22 PM   #2
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Nobody on here knows how to flush the cooling system??? lol
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07 G6 GT White, 84K, 35% Tint, 8k HID Lows/Fogs, Tinted Tails, DRL Delete, DexCool Delete (is that a mod?) Eibach Springs, EBC Brakes, Orange Calipers, De-Badged, Front Tower Strut Bar, Painted Engine/Battery Covers, CRABS Opt# 3, "Tiger CRAB Ram Air", Custom Catback stepped up to 2.5" from 2.25" tubing with purforated rez and free flow muffler.

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Old 09-23-2009, 11:28 PM   #3
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i guess i'll research "how to" do it cuz no one seems to know how. Seeming they all say "i changed that dex merc crap out and put some decent shit in"

research, ugggg!
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Coming Soon:
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Old 09-28-2009, 01:30 PM   #4
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I've personally kept the dex in mine... I recall reading something about gm systems that had been designed to use dex-cool pretty much tearing themselves apart if given anything else. so, I figure, why not? it's not like the dex is incredibly terrible, and my temps are reasonable so... eh. aside from that, i'd say take it to a lube place if you still have warranty if you don't and you find that everything i've said is false (it could very easily be, but i like to play things relatively safe), fill yer boots (and take a few pics of how you do it, I'm curious but i'd reckon it'd be similar to pretty much any other system out there... run water through 'er till she drains clear.
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Old 11-18-2009, 04:55 PM   #5
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drain plug

Yeah I'm having a heck of a time locating the drain plug.
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Old 11-18-2009, 05:39 PM   #6
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Smile

i let the dealer install mine for $150.00 was done in about 20 min.
ripped me off didn't they.
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Old 11-18-2009, 05:54 PM   #7
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I dont think there is a drain plug i this system, I took mine to a Flynn's Tire and Service center and they hooked into the lines and flushed out that Dex-Cool CRAP! They thought I was crazy for having it flushed before 100k or 5 yrs, but the history with this stuff eating through gaskets I wanted it done. They normally charge like $75 for the service.
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Old 11-19-2009, 06:04 AM   #8
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If I have time this weekend I'll look for this drain and if I find it I'll post a pic. Anyone else too!
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Old 11-19-2009, 07:18 AM   #9
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take a big shop vac and hook the hose to a radiator hose and suck everything out. then fill'R up!
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Old 07-15-2010, 06:00 PM   #10
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On the off chance that someone is still looking into a DIY way to flush our cooling systems, I'll explain my personal experience.
Firstly, there is no drain plug (at least on the 06 GTs with the 3.5 like mine).
Secondly, when it comes to flushing dexcool and replacing it with other coolants (I wanted Fords G-05 or whatever it was because supposedly it's top notch), they don't react to eachother very well, and can actually do more damage to our vehicles than good. So if you want to go that route, I'm going to say that you'll want to take your vehicle to whichever dealership has the coolant you want, and have them do it, because they'll have the equipment for an actual flush.
Now, my experience with flushing my coolant, which I did because I've been having some cooling issues lately (narrowed it down to bad wiring on the Cooling Fan 2 circuit, will be posting about fixing that in the how-to section later), involved a water hose, a large catch-tub (mine was about 2.5 foot long, a foot and a half wide, and 8-10 inches deep).
First, I jacked up the front end of the vehicle and put jackstands in place.
Next step was to remove the air intake piping (ease of access for next step).
now that that was removed, when you look down between the rad and the engine on the passenger side, there's the hose that connects the water pump to the radiator, position your catch-tub underneath this, under the car (this is why I jacked it up, no where NEAR enough room to fit the tub underneath the car on my driveway).
Using a pair of channel lock pliers, i pulled the clamp down the hose on the water pump side.
Next, i wiggled off the hose and left the coolant drain until there was no more coming out.
Re-attach the hose and put the clamp back in place.
Replace the intake piping.
On the 3.5 Litre engines you'll see a brass bleed-plug towards the front of the engine on the passenger side, connected to some black tubing. remove this (just the small plug, not the entire brass assembly).
now, fill your coolant reservoir with water and keep an eye on that brass fitting. when you see a stream of liquid coming out (solid stream, not sputtering) you can stop adding water. replace the brass plug. (this is where I used the water hose, I know, dirty me, not using distilled water in our tempermental cooling systems haha).
Turn the vehicle on and turn the a/c to max. your cooling system should kick on and mix the water with the remaining coolant-water mix.
after about 3-10 minutes it should be sufficiently mixed.
Now, repeat this process of removing the intake piping, removing the coolant hose, draining, reattaching the coolant hose, reattaching the intake piping, removing the brass plug, filling the coolant, cycling the coolant, until what you drain out during the rad hose removal is clear water.
for safety's sake (and maybe because I'm a little picky about being thorough) you can repeat the process one more time.
Now, you should have ~99.9% water in your cooling system, and you should be able half full.
Add whatever the hell you like for coolant (use that brass bleed plug when filling, as it lets all the air out of the cooling system (burp it the traditional way just for added peace of mind if you like), and enjoy your new coolant.
Now, as I said, I've read a fair bit about other coolants not agreeing with dexcool, so in no way do I take ANY responsibility if this buggers your system. Your choice of coolant is you preference, I only gave you my experience on how to flush the system. (hell, *I* put dex-cool back in to be on the safe side).

On another note, if you want to get the PERFECT 50/50 mix, keep track of how many time you drain the system and keep track of how MUCH liquid you've drained from the system.
Divide the amount by the number of times, and subtract that from the cooling system's capacity (Ask any GM technician and they should be able to tell you the capacity).
The amount you get will be the amount of water in your system, I believe it should be a bit less than half of the capacity (could be more, I wasn't picky enough to do this, it's just a thought for the next guy). from there, add whatever amount of water you need to fill the system to half capacity, and the rest coolant. Tada. 50/50 mix and a flushed (in a down-home, red-neck kinda way) system.

If you'll excuse me, I'm going to copy and paste this into it's own post in the How-To for everyone's benefit, as it's MUCH longer than I originally planned, and it should make it easier to find.

Take car everyone, and remember "Keep your stick on the ice"
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