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Old 04-27-2004, 03:25 PM   #1
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Default Draining coolant from block

If I want to drain the coolant from my 1994 SSE and/or my 1997 SSE....

is it the Knock Sensors that I remove, or is there supposed to be a separate coolant drain plug?

Are there two ( normally one each side), or just one, overall?

If it is the Knock Sensor(*), do I have to recoat the threads with something before reinstallation? With what?

Thanks...
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Old 04-28-2004, 12:28 AM   #2
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Usually I just disconnect the hoses from the block and let 'er rip....(of course it depends on where the hoses are on the particular engine you are working on)
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Old 04-28-2004, 12:30 AM   #3
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Quote:
Originally Posted by CFoote
Usually I just disconnect the hoses from the block and let 'er rip....(of course it depends on where the hoses are on the particular engine you are working on)
that is what i normally do to
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Old 04-28-2004, 12:49 AM   #4
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On the '97, the block drain plug holes were used for the knock sensors, one front and one rear. Removing these will (I think) drain more of the coolant from the block than just removing the hoses. When you put them back in, you can use any good thread sealant on the male threads of the sensors to help prevent them from leaking. The temperature won't reach 300F and the pressure won't exceed 20psi, so read the label on the sealant. RTV would probably work, or teflon pipe joint compound. Just don't use anything that will set up hard and make it difficult to remove them in the future.

More info on knock sensor location at:

http://bonnevilleclub.com/forum/view...t=knock+sensor
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Old 05-02-2004, 12:26 AM   #5
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YUP, that is what I have found too. (1999 Bonneville, Series II, VIN "K") The knock sensors are also the block drain plugs. And yes, that is the only way to get ALL of the coolant out of the block itself. -even though it is only maybe about a quart or so from each side/end.
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