Cooling System - Gasoline Engines - GMC SIERRA 1998 Manual

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If you get the overheat warning with no sign of steam,
try this for a minute or so:
1. If you have an air conditioner, turn it off.
2. Turn on your heater to full hot at the highest fan
speed and open the window as necessary.
3. If you're in a traffic jam, shift to NEUTRAL (N);
otherwise, shift
to
the highest gear while
driving -- AUTOMATIC OVERDRIVE
(@)
for automatic transmissions.
If you no longer have the overheat warning, you can
drive. Just to be safe, drive slower for about
10
minutes.
If the warning doesn't come back on, you can
drive normally.
If the warning continues, pull over, stop, and park your
vehicle right away.
If there's still no sign of steam, push the accelerator until
the engine speed is about twice as fdst as normal idle
speed. Bring the engine speed back to normal idle speed
after two or three minutes. Now see if the warning stops.
But then, if you still have the warning, turn o f t h e
engine and get everyone out o f the vehicle until it
cools down.
You may decide not to lift the hood but to get service
help right away.
Cooling System
--
Gasoline Engines
When you decide it's safe to lift the hood, here's what
you'll see:
A. Coolant Recovery Tank
B. Radiator Pressure Cap
C . Engine Fan(s)
5-15

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