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The radiator does not have a drain. You have to siphon it out or pull a hose. I don't know about the block one.

AnswerI have a 1999 4wd suburban, and yes it has a drain on the radiator. When you face the engine, standing in front of the truck, look down on the side of the radiator cowling. You should see the drain under the transmission line where it enters the radiator. The only way I could reach mine was to remove the radiator cowling and use a pair of needle nose pliers to turn the pet cock valve to drain the radiator.
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โˆ™ 2011-01-04 04:23:28
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Q: Where are the radiator and engine block coolant drains on a 1999 Chevy Surburban with 4 wheel drive?
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