Can the Cruze heating box be blocked?

Cruze heating box may be blocked. According to relevant data, to repair the hole with large water leakage, first drill the hole with a bit with a slightly larger diameter, and then cut an iron bar with a length slightly larger than the hole depth and a diameter slightly smaller than the hole diameter (the gap is 0.5- 1mm). After surface treatment, the iron bar is inserted into the hole (iron red, iron powder, aluminum powder and other fillers can be added into the glue solution to reduce shrinkage and increase compactness).