Remove the bottom cover on the passenger side of the dash behind the glove compartment, disconnect the connector on the heater motor. remove the three (3) screws in the flange of the motor. pull down and toward the seat to remove the heater motor from the housing.
DO NOT DISTURB THE AIRBAG OR IT'S WIRING TO AVOID ACCIDENTAL DEPLOYMENT OF THE AIRBAG
YOU MAY WANT TO DISCONNECT THE NEGATIVE BATTERY CABLE AND WAIT AN HOUR TO DISABLE THE AIRBAG.
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My best suggestion to you is to read the owners manual, there is a whole section on how to do that, step by step. That is where i have learned alot about the 1999 Century I own, and how to fix any problems.
Replace control unit located under dash usually in the middle section
Try it, if it doesn't work then all you have to do is go to Walmart and get an adapter for it.
How much will it cost me to replace the heater core in my 1999 Mercury
5
99 ?
10W-30