the dextron coolant gets to be nasty as hell after a few years even thought its supposed to have a i think a 5 year/100,000 mile warenty on it. The vette's is gonna need changing soon as it is smelling like **** rubber and my buddies 99 gmc siera still has the original coolant in it and it aint pretty at all. My advice is to do a simple flush and clean out the over flow tank and you should be good. There has also been cases of this happening in the blazers and it is clogging up their heater cores. The coolant in them is turning into a slushy red.
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