My 2004 Grand Prix is starting to show its age. The Series III 3800 has served me well so I'm hoping to fix its issues and get a few more thousand miles out of it.
I have the well-known oil leak that pools around the upper intake. I see a lot of information about the recalls and the fire concerns (it does roll onto headers and burn even after the "fix" of putting a different cable bracket on when I brake).
I also seem to be losing coolant though I have had trouble identifying a leak. I just seem to need to add coolant every few weeks. (I get gurgling in the heater core and eventually bubbles get stuck around the bleeder and the temperature climbs when idling, but will maintain temp when running hard) Adding coolant and bleeding buys me another week or two so I've taken to just adding coolant regularly and bleeding weekly.
I see a ton of information on replacing Series II intakes because of the plastic plenum issue, but I was curious if they are similar enough to the Series III replacement jobs, and if this is likely to solve either/both of my issues.
Most of the old good How-Tos on here are now dead links, so pointing to a good Upper or Lower intake gasket replacement how to would be greatly appreciated.
