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Get a bright flashlight and look all around the intake manifold gasket area. The Dex-cool antifreeze used in GM cars and trucks can deteriorate the manifold gaskets and cause coolant to leak. Very difficult to find, but if it is leaking there, the manifold will have to be removed and a new gasket installed.
If that is a 318 or 360 V8 check the small hose from water pump to the intake manifold they had a habit of developing a leak and it can spray over towards the alternator.
it is a short L shape hose from water pump to intake manifold.
Also check heater hose under the alternator for leaks or cracks.
The loss of antifreeze with no apparent leaks could be the sign of many things including blown head gasket, cracked tank, or leaking water pump. I would lean toward a head gasket first. Have you checked the oil for signs of antifreeze? A head gasket won't leak until the system is under pressure and running at normal temperature. You could also have a cracked head although that is pretty rare. Check the oil and plugs for signs of anti freeze. Also check the tanks on the side of the radiator they could be cracked which only leak while under pressure. Check all hose connections and if so equipped tranny cooler lines to make sure they are all attached correctly.
Buick 3.8's are notorious for intake manifold leaks. If you are sure you are not leaking externally (look under the alternator and on the top of the transmission), it could be an intake manifold leak. I've replaced mine...I didn't think it was too hard a job for an amateur. It could also be a head gasket, but the intake leaks are much more common.
it could but- check passenger side front where heater core line go into manifold right behind alternator the hose line is connected by a press clip into an alloy fitting this fitting gets eaten away by anti freeze and hose angle pulls back on fitting the part is $18 at dealer and is screwed into manifold use caution if ur r going to replace at very edge of aluminum manifold---and check ur water pump bolts the 2 longer ones should have a lock sealant on them they bolt in thru a water jacket
A leaking manifold could cost you a VERY expensive repair. I recommend getting it fixed as soon as you can. And with the antifreeze...seeing how it it a GM it should take DEX-COOL. But look under the hood and look for a white sticker and it should say "This vehicle takes DEX-COOL coolant. Do not mix with any other coolant" and if not the cap for the coolant should say so. If so, then obviously you need DEX-COOL or universal coolant. Universal will not harm anything, but I would use the manufacters reccommendations just on the safe side.
there is a coolent tube runing under the lower intake manifold it will leak or bust open it comes right out the back in the water delivery unit get you book and pull the upper manifold and you should be able to see the problem if it is pull the lower and repair the tube.
You may have a lower intake manifold gasket leak (or a head gasket leak-slightly less probable) the lower intake can leak onto the serpentine belt and fling oil (and/or antifreeze). The lower intake manifold gasket is usually the culprit here. There is much information about changing it if you are inclined to do it yourself. If not, expect around 800 to 1200 to fix at dealer/mechanic. This is usually accompanied by (but not always) oil in the antifreeze, or antifreeze in the oil...
there is a small heater hose on the pass side rear from the firewall(heater core) to the intake manifold. the plastic manifolds have a tendency to split where the hose fitting goes into the intake. If that is where it is leaking the manifold needs replacement.