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1994 Chevrolet G Series Van (G20) Question: How do I drain the block of coolant?

 

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tomcarper, 5.7L V8, Cleveland, TN, May 26, 2012, 12:16
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Following the instructions for changing the coolant, I can only get about 2 and 1/2 gal. out of the system.
With a rear heater everything tells me I should be replacing 5 gal.

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