Well well, if it isn't my old friend MS. LOWER INTAKE MANIFOLD GASKET LEAK!
I hope I'm wrong here but all the symptoms are pointing to it. To be sure you have to find the where the leak is coming from first. I suggest cleaning the front of the engine real good. But do not spray water all over the engine just clean the front. Keep in mind that there are all kinds of sensors on the engine and if they get wet or if steamed up they may fail or cause a lot of problems, so be carefull when cleaning any engine. Look close for leaks, if you still cannot find it get some of that stuff that goes in the coolant and kind of glows in the dark.
You will be lucky if it's a water pump, but most likely you will find the coolant coming out from the area where the lower intake manifold bolts to the head. To fix this is not real hard you just need patience, mechanical ability, a torque wrench that measures INCH pounds, and about two days or so. These engines are famous for this. A mechanics charge for this should be around $600 or so. Let me know how you make out and if you decide to do it yourself then I can help you through it if you need it.
BTW I said MS. Lower intake manifold gasket leak because they are all the same, just like women. That's a different story all together
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Wednesday, November 21st, 2007 AT 12:39 PM