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what could it be ! thankss
Sounds like a T-stat

I'm having a similar problem... car is overheating, and there is no coolant running to the heater core, or back to the reservoir.
Your problem sounds like the waterpump.

That's a classic sign of a thermostat that's stuck in closed position. Not a hard or expensive thing to replace.

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.
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