Where is the diagnostic port on a 2003 mitsubishi eclipse

SOURCE: Location of thermostat 2003 Mitsubetsi Eclipse 4

The thermostat is found at the end of the top radiator hose . Find the top radiator hose and follow it to the engine .There you will find a thermostat housing with the end of the hose attached . There will be 2 bolts holding down the housing to the engine. Undo the bolts and pull the housing off and the thermostat will be there.

SOURCE: Stalls when at idle after changing battery

When you changed the battery the computer must re-learn the setting again. If it continues have a OBD II reader plugged in and check for codes.

SOURCE: I need to remove and replace the Radio in 2003 mitsubishi eclipse

I WOULD LET THE DEALERSHIP REPLACE RADIO BECAUSE BY IT BEING PART OF THEFT SECURITY SYSTEM.IF YOU DO IT YOUR SELF YOU PROBABLY GOING TO HAVE NO START PROBLEMS.THE PCM WILL GO IN THEFT MODE THINKING SOMEBODY TRYING TO STEAL RADIO OR CAR.IF DEALERSHIP FIX THEY PUT IN NEW RADIO THEN REPROGRAM IT.