No heat shield for the exhaust mainfold on the Saturn S-series cars. Drawing air from under the hood should not be able to effect the engine temp one way or the other.
Potentially having disturbed/damaged something while installing the intake is a possibility. Check the PCM coolant temp sensor and wiring to see if you shifted anything around there.
Perhaps you have just hit hotter weather? Perhaps the coolanat tmep sensor has coincidently decided to go bad.
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