Engine leaking water
I had a 2000 malibu 3.1 and the manifold gasket was leaking. Model years affected, 97-04. Check the recovery coolant tank and if it looks like a milk shake instead of coolant, then you have a bad intake manifold gasket. I replaced mine a few years ago and all was fine. Engines affected are the 2.4-3.1-and 3.5, look very carefully around the intake manifold and you will see it if its leaking! operating the engine with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks. Because oil will mix with coolant if gasket is bad. Hope this helps you out! Good-Day!
SOURCE: 2001 VW Passat leakin water
I would highly suggest a pressure test to really pin point this leak. I can tell from diagram that the coolant expansion tank line goes right thru that area. I would also caution you to the obvious with this vehicle- everything is a tight fit and coolant leaking from the t-stat housing and or water pump could look similiar. I strongly suggest a pressure test to keep from throwing good money away.
SOURCE: engine block freeze plugs are leaking coolant
You will have to replace the freezer plugs. Please rate this solution.
SOURCE: replaceing freeze plugs in the back of a side
1) Drain all coolant from the engine/radiator.
2) Drill a hole in the old plug to allow you to thread a lag bolt, which will then be used to pull the old plug out. Or use whatever means you can to remove the old freeze plug.
3) Thoroughly clean the hole with a wire brush attached to a drill motor.
4) Apply sealant to new freeze plug and locate into the hole.
5) Tamp the plug into the hole, flush with the block, with a hammer.
6) Refill radiator with coolant.
7) Check for leaks.
This isn't going to be easy with the engine in the car, but it can be done.
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