Loud whining noise, white smoke and bad smell. What's wrong?

What is your question?

The whining noise has been around for a while. We had the A/C compressor and condenser replaced recently. The car isn't overheating, but white smoke comes out of the engine compartment and there's a bad smell - kinda like coolant. The "check engine" wrench is lit on the dashboard. Looks like we have only 5% of oil life left. Do we just need an oil change??