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My 03 CTS is revving high when I start it up but it only does this when the coolant level gets low help me please
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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We all need help. I changed your thread title to be a bit more descriptive of your problem.

Welcome to CF !!!

How high does the rpm go? When cold the engine should do a fast idle sequence at about 1250 rpm, then down to about 900, then down to the normal 650 idle.

Coolant level (or do you mean coolant temperature) in the surge tank has nothing to do with idle speed - no corresponding sensors or PCM monitoring.
 

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2007 CTS 3.6 >128k miles
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Does the coolant level drop frequently in your car? If so you have a leak somewhere. The coolant level should stay pretty consistent over time (maybe a slight drop over a year but not more than that).
 
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