DETROIT, MI -- Police Chief James Craig on Friday said the city's emergency dispatch radio system, which went out of service and had officers communicating via cellphone for two hours earlier this week, still isn't 100-percent fixed.

He said he's met with the vice president of Motorola, the system's vendor, and that he expects repairs to be complete by Monday.

"We know now that it's a hardware issue and the hardware most likely failed due to heat," Craig said. "I believe the air conditioning system wasn't working and so it failed."

He said it was both Motorola and the police department that dropped the ball in failing to prevent the problem.

The city pays about $1.4 million a year for maintenance, Craig said, and he doesn't expect the repairs to cost any additional money.

Craig, who took over as chief of the department this month, said he intends to regularly hold media briefings as he did today to update the public on the progress of major changes taking place.

He said he's discovered that 365 officers have been wearing expired bullet-proof vests.

"In a major city, that's just unacceptable," Craig said. "... I've been moving very quickly in making sure that every officer has a current bullet-proof vest."

He also said that he's disallowed the use of city-owned cars as take-home vehicles for officers and is trying to improve the quality of the department's fleet.

"This is the Motor City," he said. "We should have the best fleet."

A group of corporations donated a fleet of vehicles earlier this year.

"We have a few of them in," he said. "We haven't deployed them yet."

And the chief announced hiring a group of consultants to aid the department's restructuring.

"We have what I would consider an all-star team," he said. "... There is tremendous change that is occurring in the Detroit police department."

Follow Khalil AlHajal on Twitter @DetroitKhalil or on Facebook at Detroit Khalil. He can be reached at kalhajal@mlive.com or 313-643-0527.