how do i replace a thermostat on a 2006 saturn ion 2.2L

What is your question?

the check engine light come on sometime while driving and then it go back off the engine code is PO128 the temperture get up to about 174 when driving is that the correct number? can you send me pictures showing how to replace the thermostat?

How long has your 2006 Saturn Ion had this problem?

a few weeks