2003 GMC SONOMA heater

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Page 11 of 424

GMC SONOMA 2003  Owners Manual Power Lumbar
If your vehicle has this
feature, there will be a
control located on
the outboard side of
the front seat(s).
Press and hold the front of the control until you have
the desired lumbar supp

Page 73 of 424

GMC SONOMA 2003  Owners Manual Keys...............................................................2-3
Remote Keyless Entry System.........................2-4
Remote Keyless Entry System Operation...........2-5
Doors and Locks......

Page 96 of 424

GMC SONOMA 2003  Owners Manual Engine Coolant Heater
Your vehicle may be equipped with this feature.
In very cold weather, 0°F(–18°C) or colder, the engine
coolant heater can help. You’ll get easier starting and
better fuel e

Page 146 of 424

GMC SONOMA 2003  Owners Manual Heating
Turn the center knob clockwise or counterclockwise to
raise or lower the temperature on the inside of your
vehicle.
When it’s cold outside 0°F(−18°C) or lower, use the
engine coolant hea

Page 237 of 424

GMC SONOMA 2003  Owners Manual {CAUTION:
Snow can trap exhaust gases under your
vehicle. This can cause deadly CO (carbon
monoxide) gas to get inside. CO could
overcome you and kill you. You can’t see it or
smell it, so you might

Page 283 of 424

GMC SONOMA 2003  Owners Manual How to Check and Add Fluid
The properfluid should be added if the level does not
reach the bottom of the diaphragm when it’s in place
in the reservoir. See the instructions on the
reservoir cap.
En

Page 284 of 424

GMC SONOMA 2003  Owners Manual What to Use
Use a mixture of one-halfclean, drinkable waterand
one-half DEX-COOL®coolant which won’t damage
aluminum parts. If you use this coolant mixture,
you don’t need to add anything else.
{

Page 287 of 424

GMC SONOMA 2003  Owners Manual If No Steam Is Coming From Your
Engine
If you get an engine overheat warning but see or hear
no steam, the problem may not be too serious.
Sometimes the engine can get a little too hot when you:
•Cl
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