Cylinder block drain

2004 CHEVROLET SUBURBAN

104,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC

MARK_HOLSTEN

MEMBER
7 POSTS
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I am doing a coolant flush and, according to the Chilton book, one step is to drain the engine block. However, I cannot find where the plugs are on either side of the block.

Is it even possible to drain the engine block? If so, where are the plugs?

Jun 24, 2018 at 1:29 PM

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ASEMASTER6371

AUTOMOTIVE REPAIR CONTRIBUTOR
52,796 POSTS

Good afternoon.

On either side there is a plug at the bottom of the block you can remove. It is very small and most times it is blocked by something mounted on the block. It is in the middle from front to back.

If you remove the lower hose and have the thermostat out, it will drain majority of the block from that.

Roy

Jun 24, 2018 at 2:02 PM

PATENTED_REPAIR_PRO

AUTOMOTIVE REPAIR CONTRIBUTOR
1,853 POSTS

Here is a diagram of its location.

Image (Click to enlarge)

Jun 24, 2018 at 2:20 PM