1. Shift the gear lever to the `P` position and apply the parking brake.
2. Open the hood and remove the battery. Disconnect the negative terminal first, then the positive terminal.
3. Remove the ashtray. Pull it out by grasping the front edge and pulling straight up.
4. Remove the center console trim. There are two screws located at the front of the trim, under the ashtray. Remove these screws, then carefully pry the trim up and off.
5. Remove the gearshift knob. Press down on the button on the top of the knob and pull it straight up.
6. Remove the center console. There are four screws located at the bottom of the console, two in front and two in back. Remove these screws, then carefully lift the console up and out.
7. Disconnect the electrical connectors. There are several electrical connectors located at the back of the console. Disconnect these connectors, then remove the console completely.
Once you have removed the center console, you will be able to access the heater core and inspect the O-rings for leakage. To replace the heater core, you will need to remove the dashboard.
Here are some additional tips for removing the center console of a Mercedes-Benz 190-Series:
- Be careful not to damage the wood trim when prying it up.
- If you have difficulty removing the center console, you may need to use a pry tool.
- Be sure to disconnect all of the electrical connectors before removing the console.
I hope this helps! Let me know if you have any other questions.