What causes a catalytic converter to turn red in a 1990 Cadillac Seville?

A catalytic converter can turn red in a 1990 Cadillac Seville due to excessive heat, often caused by a malfunctioning engine or fuel system. This could result from issues like a rich fuel mixture, misfiring spark plugs, or a clogged exhaust system, leading to increased exhaust temperatures. Additionally, a failing catalytic converter itself can contribute to overheating, further exacerbating the problem. It's crucial to address these underlying issues to prevent damage.