'03 Chevy Venture with 126k. Several months ago, I had to get the intake manifold replaced due to DexCool corrosion. The clue was antifreeze dripping on my driveway. I replaced the DexCool with Green at that time too.
NOW, I still get a check engine light. I take it to the parts store for a diagnostic and they tell me low coolant temperature. The temp gauge was running low. I replaced the coolant temp sensor but no help. I top off the antifreeze and the light goes away for about a month but then comes back. There's no dripping antifreeze on my driveway and none on the dipstick, as far as I can tell. If there was antifreeze in my oil, it would be creamy and milky on my dipstick, right? Someone suggested a stuck open thermostat could be making my antifreeze run cool but would that explain the disappearing antifreeze? Any ideas?