Ok it's time to replacement the engine coolant i have done this a 1000 times on other vehicles trucks but never a C5 is their anything special i need to know?

Thanks
Jeff, Orlando.

 

Nothng special, I did have a power flush, I feel better doing that, than a drain and fill or a flush and fill. But all you, and good luck

 

Draining and Filling Cooling System

Caution
With a pressurized cooling system, the coolant temperature in the radiator can be considerably higher than the boiling point of the solution at atmospheric pressure. Removal of the surge tank cap, while the cooling system is hot and under high pressure, causes the solution to boil instantaneously with explosive force. This will cause the solution to spew out over the engine, the fenders, and the person removing the cap. Serious bodily injury may result.

Important
If the procedure below is not followed a low or high coolant level condition and/or vehicle damage could result.

1) Park the vehicle on a level surface.

2) Remove the surge tank cap.

3)Raise and suitably support the vehicle.

4) Place a drain pan under the draincock.

5) Open the radiator draincock.

6) Allow the cooling system to drain completely.

7) Inspect the engine coolant for the following:
Discolored -- follow the flush procedure below.
Normal in appearance -- continue with the next step.

Notice
When adding coolant, use DEX-COOL® coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50 000 km (30,000 mi) or 24 months.

8) Close the radiator draincock. Tighten.
Tighten the radiator drain fowl to 2 N·m (18 lb in).

9) Fill the cooling system through the surge tank.

10) Fill the cooling system with a 50/50 mixture of DEX-COOL® coolant and deionized water.

11) Start the engine.

12) Allow the engine to idle for 1 minute.

13) Install surge tank cap.

14) Cycle the engine RPMs from idle to 3000 in 30 second intervals until the coolant temperature reaches 99°C (210°F).

15)Shut off the engine.

16) Remove the surge tank cap.

17) Start the engine.

18) Allow the engine to Idle for 1 minute. Fill the surge tank to 12.7 mm (0.5 in) above the COLD FULL mark on the surge tank.

19) Install the surge tank cap.

20) Cycle the engine RPMs from idle to 3000 in 30 second intervals until the coolant reaches 99°C (210°F).

21) Shut off the engine.

22) Remove the surge tank cap.

23) Top off the coolant as necessary, 12.7 mm (0.5 in) above FULL COLD mark on the surge tank.

24) Rinse away any excess coolant from the engine and the engine compartment.

25) Inspect the concentration of the engine coolant.

26) Install the surge tank cap.

 

[QUOTE=Patches]Draining and Filling Cooling System


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9) Fill the cooling system through the surge tank.

10) Fill the cooling system with a 50/50 mixture of DEX-COOL® coolant and deionized water.

Are you saying I have to use distilled water????

 

If you don't use distilled water, minerals and PH will be added to the system that can interact with the metals in the motor and corrode. Distilled water is really just water, where drinking water is water plus minerals, tap water is minerals/organisms/PH. Distilled is the only way to go. $2 at the grocery store and you're good to go. For $2 just do it.

I wouldn't change the coolant if it's still clear. Bigtime overkill IMHO.

Eugene

 

I work in a Power plant and know what DI water is. We have to keep every thing out of the water to prevent damage to boilers and turbine generators.
Thanks

 

I used the pre-mixed coolant.

 

Is the pre-mixed coolant equivalent to Dex Cool? Only Texaco makes Dex Cool. Prestone makes something that is supposed to be comparable to Dex Cool but the GM Owners manual is very clear when it says to use Dex Cool by Trademark name. They do not call out a specification. That means use only Texaco the way I read it. In my area you have to hunt to find Texaco.
Bill