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Re: Correct radiator flush procedure?
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Posted by REM in Seattle (more from REM in Seattle) on Fri, 28 Mar 2008 05:14:08 Share Post by Email
In Reply to: Correct radiator flush procedure?, Quentin, Wed, 26 Mar 2008 16:17:36
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The cooling system holds 8.5 liters or 8.98 quarts. Therefore, you need 4.5 quarts of un-diluted coolant and 4.5 quarts of distilled water to completely fill the system with a 50/50 mix of coolant and water.

Here is what I do.

1) Drain the cooling system by removing the lower radiator hose.

2) Refill the cooling system with straight distilled water.

3) Run the engine (adding distilled water as needed to fill the reservoir) until the engine reaches normal operating temperature.

4) Let the engine cool and drain the cooling system again.

5) Refill the cooling system with straight distilled water.

6) Run the engine (adding distilled water as needed to fill the reservoir) until the engine reaches normal operating temperature.

7) Let the engine cool and drain the cooling system again.

8) Add 4.5 to 5 quarts of un-diluted coolant and then add distilled water until full; run the engine until the engine reaches normal operating temperature (adding distilled water as needed to fill the reservoir).

The system is self-purging so any entrained air will be expelled through the coolant reservoir.

Doing it this way requires about 4 gallons of distilled water and 2 gallons of new coolant.


REM in Seattle
2005 Saab 9-3 Aero Convertible; 5-speed; 18,000 miles
1998 Saab 900SET; 5-door; Automatic; 98,000 miles
1984 Saab 900T; 3-door; 5-speed; 242,000 miles (RIP)

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