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Re: intake manfold leaking antfreez
I am assuming that you have an external leak at the manifold area, though it could also be internal. This was an issue and in 2004 GM redesigned the intake gaskets to address this issue. I have also seen manifolds warped and or rusted, but that is rare. Ask for the updated gaskets at your local parts store.
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I hate when that happens ! if you can visually see the coolant leaking out from intake manifold @ gasket, yes it needs replaced. the gaskets. just did it to my winter car that sat outside, a lot of work , just to replace the gaskets. don't think agasket sealer would work here, intake manifold needs to come off along with alot of other things, PATIENCE is a virtue, good luck
the EGR , is valve connect between intake and exhaust mafold have difram to move open and close . look to intake manfold and one pipe (metal) white coler with two bolts braket in exhaust manfold and have around difram valve with vacum hose line .
I would first check in the cab on the floor just under the heater to make sure there isn't any antifreeze leaking there. Check the resovour and make sure is isn't over full. If leaking in the cab the heater core is bad. You may have to drop the heater core housing which is not very easy. Check around the heater hoses very carefully for any slight leaks. Good luck.
Check the intake manfold and gaskets for vacuum leaks. too ways to do this plug the throttle body completly with your had if it does not stall out you have a vacuum leak. Take some carb cleaner and spray it around the mainfold and notice for idle changes to pinpoint the leak. hope the info helps please rate.
Could be the intake manfold, the big block that the carborator sets on. It is common for these to start leaking on this engine. Hopefully it is just a heater hose leeaking. Changing the intake could be expensive. If it is the intake, it will cause the jimmy to overheat eventually. look between the intake and were it bolts down to the engine aroung the area you see the water coming from.