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GMC 1998 Sonoma Owner's Manual page 278

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Radiator Pressure Cap
I
NOTICE:
Your radiator cap is a 15 psi (105 kPa)
pressure-type cap and must be tightly installed to
prevent coolant loss and possible engine damage
from overheating. Be sure the arrows on the cap
line up with the overflow tube on the radiator
filler neck.
Thermostat
Engine coolant temperature
1s
controlled by a thermostat
i n the engine coolant system. The thermostat stops the
flow of coolant through the radiator until the coolant
reaches
a
preset temperature.
Power Steering Fluid

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