Yes the DexCool has caused a lot of problems, including intake manifold gasket failure.
I think GM has warranted them to 80,000 miles, so you may be able to have them repair it.
If not, first perform a compression test to verify head gaskets are OK, then a cooling system test to find leak.
Check engine oil, for chocolate color, which would indicate coolant in oil.
Saturday, August 22nd, 2009 AT 10:24 AM