Sounds like a T-statwhat could it be ! thankss
Your problem sounds like the waterpump.I'm having a similar problem... car is overheating, and there is no coolant running to the heater core, or back to the reservoir.
Are you kidding? While the T-stat itself is cheap you pretty much have to remove timing belt to change it. I've heard of a couple guys that have managed to wrestle it out without removing the timing belt but you best bet is to just do the full t-belt, wp, t-stat swap if you have to go in there, it's certainly not a quick and easy job on the 2.7t.That's a classic sign of a thermostat that's stuck in closed position. Not a hard or expensive thing to replace.