its a head or head gasket issue....i would have a leak down or combustion leak test performed....
here are a few service bulletins
Bulletin No.: 00-06-02-001
File In Section: 06 Engine/Propulsion System
Date: January, 2000
Some customers may comment on one or more of the following conditions:
The radiator filler neck may have an imperfection in the sealing surface.
Using a piece of 400 grit wet/dry sandpaper backed with a flat piece of wood, polish the filler neck sealing surface using a circular motion.
Replace the radiator pressure cap with a cap of the same part number as shown in the GM Service Parts Catalog.
For vehicles repaired under warranty, use:
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 00-06-01-016
Date: August, 2000
Subject: Enhanced Aluminum Engine Component Thread Repair Process
Models: 1993 Cadillac Allante1993-2001 Cadillac Eldorado, Seville1994-1999 Cadillac DeVille Concours1996-2001 Cadillac DeVille2000-2001 Cadillac DeVille Touring1997-2001 Chevrolet Corvette1998-2001 Chevrolet Camaro1995-2001 Oldsmobile Aurora (V8)1999-2001 Oldsmobile Intrigue2001 Oldsmobile Aurora (V6)1998-2001 Pontiac Firebirdwith 2.2 L, 3.5 L, 4.0 L, 4.6 L or 5.7 L Engine(VINs F, H, C, 9, Y, G, S - RPOs L61, LX5, L47, L37, LD8, LS1, LS6)
Attachments are only available to registered users.
An enhanced thread repair process has been developed for use on General Motors aluminum engine components for the above listed engines. The thread repair kits used for this process represent a significant advancement in aluminum component thread repair, providing consistently repeatable high quality repairs which, when properly performed, will meet or exceed the original specifications. This enhanced thread repair process can, and should, be used to repair aluminum engine components, instead of complete engine replacement, whenever possible. Kent-Moore has distributed these thread repair kits to General Motors dealerships as part of their essential tool packages. The J 43965 Thread Repair Extension Kit has proven to be invaluable in the repair of difficult to access thread repair locations. Listed are the Engine VINs / RPOs and the applicable Kent-Moore essential tool thread repair kits.
Consult the appropriate applicable GM Service Manual or Kent-Moore thread repair kit for complete detailed instructions on the proper use of the above thread repair kits.
Important : This Thread Repair
but so in the lift i have the front tires driving and it does not overheat.
sing of the combustion heat leaking into the coolant system: whats the meaning of this?