Global Machinery Company Sierra 1999 - Manual (Page 156)

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NOTICE:
If you keep driving your vehicle with the
transmission TRANS HOT...IDLE ENGINE
message displayed, you can damage the
transmission. This could lead to costly repairs
that may not be covered under your warranty.
The following situations can cause the transmission to
operate at higher temperatures:
D Towing a trailer
D Hot outside air temperatures
D Hauling a heavy load
D Low transmission fluid level
D High transmission fluid level
D Restricted air flow to the radiator and the auxiliary
transmission oil cooler (if equipped).
A temporary solution to hotter transmission operating
temperatures may be to let the transmission cool down.
If the transmission is operated at higher temperatures on
a frequent basis, see “Scheduled Maintenance” in the
Index for the proper transmission maintenance intervals.
LOW COOLANT
This message is displayed
when the cooling system is
low on coolant.
The engine may overheat. See “Engine Coolant” in the
Index and have your vehicle serviced as soon as
you can.
CHECK COOLANT TEMP
This message is displayed
when the cooling system
temperature gets hot.
Check the coolant temperature gage and the coolant
level. See “Engine Coolant” and “Engine Coolant
Temperature Gage” in the Index. See“Engine
Overheating” in the Index for further information.