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if there are no signs of leaks on the ground, gm is known for leaky head gaskets. i have the problem on my 03 grand am gt. look around the plenum or intake manifold and you should see signs of antifreeze burn-off or small accumulation puddles in the crevices of the block or cylinder heads. or check your oil and see if it looks like a "strawberry shake" color, if yes then it's leaking into your oil passages...not good!!!! your engine may stall due to lack of lubrication meaning EXPENSIVE REPAIR! hope this helps or gives you ideas of what to look for.

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Q: What happens on a 2001 GMC Sierra AntiFreeze reservoir becomes low all the time?
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