GMC 1994 Yukon Owner's Manual page 73

3. If this light does not come on, or the instant the light goes off, turn your
ignition key to START. When the engine starts, let go of the key.
I
NOTICE:
Holding your key in "Start" for longer than 15 seconds at a time
will cause your battery to be drained much sooner. And the
excessive heat can damage your starter motor.
4. If the engine does not start after 15 seconds of cranking, turn the
ignition key to
OFF.
Wait one minute for the starter to cool, then try
the same steps again.
If you're trying to start your engine after you've run out of fuel, follow the
steps in "Running Out of Fuel" (see "Diesel Fuel Requirements and Fuel
System'' in the Index).
When your engine is cold, let it run for a few minutes before you move your
vehicle. This lets oil pressure build up. Your engine will sound louder when
it's cold.
NOTICE:
If you're not in an idling vehicle and the engine overheats, you
wouldn't be there to see the coolant temperature gage. This
could damage your vehicle. Don't let your engine run when
you're not in your vehicle.
Cold Weather Sfarting (Diesel Engine)
The following tips will help you get good starting in cold weather.
Use SAE low-30 oil when the outside temperature drops below freezing.
When the outside temperature drops below 0°F (-1
8°C)' use your engine
coolant heater.
If you park your vehicle in a garage, you shouldn't need to use the coolant
heater until the garage temperature goes below 0°F (-1 S"C), no matter how
cold it is outside.
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