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Q:

Where is the coolant temp sensor located at? on 1999 Pontiac Sunfire

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The car starts when it is warm outside but not when its cold outside. I was told it is the coolant temp sensor. Is this so..
(2) Answers
The coolant temperature sensor in your 1999 Pontiac Sunfire should be located in the thermostat housing which is where the upper radiator hose connects to the engine block. There is no way to know if replacing the coolant temp sensor will correct your problem with out properly diagnosing the condition. You may need the help of a qualified repair shop. To find one near you please use the following link to the RepairPal shop index - http://repairpal.com/pennsylvania-auto-repair