Pontiac Problems? Ask a Mechanic for Answers ASAP
This is a common problem on the Grand Prix. The circuit through the ignition switch that feeds the heater fan also feeds the DIC (dash display) and on some vehicles the DRL circuit as well. The problem is in the contacts in the ignition switch. The fan draws enough current that voltage drops too low and the dash display cuts out. Replacing the ignition switch will fix the problem.