Cadillac 1993 Fleetwood Owners Literature page 242

IfNo Steam Is Coming From Your Engine:
If you get the 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:
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Climb a long hill on a hot day.
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Stop after high speed driving.
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Idle for long periods in traffic.
Tow a trailer.
If you get the overheat warning with no sign of steam, try this for a
minute or so:
1. Turn off your air conditioner.
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2. Turn on your heater to full hot at the highest fan speed and open the
3. If you're in a traffic jam, shift to
"N"
(Neutral).
window as necessary.
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If you no longer have the overheat warning, you can drive. Just to be safe,
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drive slower for about ten 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.
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If there's still no sign of steam, you can idle the engine for two or three
minutes while you're parked, to see if the warning stops. But then, if you
still have the warning, TURN OFF THE ENGINE AND GET
EVERYONE OUT OF THE VEHICLE until it cools down.
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You may decide not to lift the hood but to get service help right away.
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