GMC SIERRA 1995 Manual page 248

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7. Then
fill the
coolant surg,e
tank with the
proper mix. up to
the
COLD mark.
8. With the coolant surge tank pressure cap off, start the engine and let it
run until you can feel the upper radiator hose getting hot. Watch out for
the engine fan(s).
By
this time, the coolant level inside the coolant surge tank may be
lower. If the level is
lower, add more of the proper mix to the coolant
surge tank until the level reaches the COLD mark.
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