uh, mixing colors of fluids will NOT cause explosions, leaks, or acute damage.


So dont blame your mechanic.




More likely the car had issues w the cooling system, the guy sold it, and now you are seeing the issues.






Edit: we humans have a tendency to try and create order out of what we can see IMO, you are doing that with the very limited data you have- a convo with the prior owner, reflilling low coolant, a blue and red coolant...... all gets turned into a cause and effect.