The 3.5L engine overheats at idle or on a road test because the thermostat will not open.

The only way the thermostat will open is if I bypass the heater core, and then everything is fine.

The return line from the heater core ends up at the thermostat hous...

FIX posted 12/29/2009

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle