I have a 2002 Chevy Venture, 3.4L with 66k miles. I recently noticed a leak orginating from the lower intake manifold bolts. Considering the number 4 bolt, adjacent to the temperature sender, was so loose I could turn it with my fingers, I removed the upper intake plenum and tightened all the lower intake manifold bolts. This appears to have resolved the issue in the short term. Skeptical, I found this forum.
Since reading I have downladed the March 2003 service bulletin and contacted GM Customer Assistance Center. The rep has requested the vehicle be inspected by my local Chevy service center and with the diagnosis and estimate for repair of a leaking IMG, the rep will let me know what Chevy will be able to offer me towards the repair if anything. But first I have to foot the bill for a diagnosis $90.
Reading the previous threads I am not too optomistic, but I will try and let you all know how Chevy reponds.