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Cylinder block drain

Tiny
MARK_HOLSTEN
  • MEMBER
  • 2004 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 104,000 MILES
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?
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Sunday, June 24th, 2018 AT 1:29 PM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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
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Sunday, June 24th, 2018 AT 2:02 PM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
Here is a diagram of its location.
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Sunday, June 24th, 2018 AT 2:20 PM

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