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Old 06-04-2007, 03:43 AM   #1
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Default Block Drain? – Flushing out the Dex

Getting ready to flush the DexCool out of my S2 L67 cooling system to switch to green. To be thorough, I want to drain the block too.

I have read posts about pulling the knock sensors, however when under the car today I noticed what looks to be drain plugs on each side of block.
It looks like a hex bolt head slightly recessed in a boss on the side of block.

Below are two cell phone pics looking up the front side of block from under the car.


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Are these drain plugs for the block?
If so, how are they sealed (thread sealant, o-ring, copper washer)?


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Old 06-04-2007, 08:44 AM   #2
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All those bolts are oil pan bolts.

Remove the knock sensors. They are just to the sides of the oil pan in the middle of the motor from front (by water pump) to back (transmission).. have a one wire connector going to them. Each is round and will require a large socket to remove.
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Old 06-04-2007, 12:52 PM   #3
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The bolt I was wondering about comes off the side of the block about 2" above the oil pan gasket, behind the starter. Just wondering if this can be an alternative to knock sensor removal.
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Old 06-04-2007, 01:09 PM   #4
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Yep, that'* a drain plug. There is one on the other side, too.
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Old 06-04-2007, 01:50 PM   #5
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Honestly..On a SII your best method of draining will be the knock sensor. Easier to get at IIRC as well.

I've rolled them over once the KS'* were removed and there is nothing left.
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Old 06-04-2007, 07:47 PM   #6
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Thanks - that’* what I was wondering about .
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Old 06-04-2007, 11:10 PM   #7
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I've drained coolant..thought I had it all.. then removed a knock sensor and ... poof..there'* the other 3 gallons.
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Old 06-05-2007, 07:12 AM   #8
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Would having the system flushed at a garage and filled with non-Dex coolant do the trick too?
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Old 06-05-2007, 09:44 AM   #9
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Sure, but why wouldn't you of all people do that yourself?
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Old 06-05-2007, 09:46 AM   #10
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Oh, just a question..... Besides, a good high pressure flush can be a great thing....
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