How to Add Coolant to the Radiator- Page 217

1999 Buick Riviera Owner Manual

Model Year
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5-15

How to Add Coolant to the Radiator

1. You can remove the

radiator pressure cap
when the cooling
system, including the
radiator pressure cap and
upper radiator hose, is
no longer hot. Turn the
pressure cap slowly
counterclockwise until it
first stops. (Don’t press
down while turning the
pressure cap.)

If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.

2. Then keep turning the pressure cap, but now push

down as you turn it. Remove the pressure cap.

3. Fill the radiator with the

proper DEX

-

COOL

R

coolant mixture, up to
the base of the filler
neck. (See “Engine
Coolant” in the Index
for more information
about the proper 
coolant mixture.)

4. Then fill the coolant recovery tank to FULL COLD.

Detailed Information for 1999 Buick Riviera Owner Manual

Lists of information found in 1999 Buick Riviera Owner Manual - Page 217

  • 1. You can remove the radiator pressure cap when the cooling system, including the radiator pressure cap and upper radiator hose, is no longer hot.
  • 2. Then keep turning the pressure cap, but now push down as you turn it.
  • 3. Fill the radiator with the proper DEX - COOL R coolant mixture, up to the base of the filler neck.
  • 4. Then fill the coolant recovery tank to FULL COLD.

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