See also:

How to Add Coolant to the CoolantRecovery Tank
If you have not found a problem yet, but the coolant level is not at the FULL COLD mark, add a 50/50 mixture of clean, drinkable water and DEX-COOL® engine coolant at the coolant recovery tank. ...

Tachometer
The tachometer displays the engine speed in revolutions per minute (rpm). ...

ENGINE OVERHEATED — IDLE ENGINE
This message displays when the engine coolant temperature is too hot. Stop and allow the vehicle to idle until it cools down. ...