So when I took my CSC in to get tuned up, they told me the list of problems it had and i splurged the money to get it fixed. This included the valve gaskets, transmission mounts, sparks/wires, distributor, and a trans leak. So When I picked it up yesterday, they told me they found out the heater core was leaking and put something in it to help. I never noticed this before and the heat worked perfectly, no moisture. Now tonight it was freezing, I turned the heat on and the coolant smelling steam came out full blast and the car died. Now it won't start, it turns, but it won't start. What the hell did they put in it and why did it just happen to do this now? Bc I'm pissed.