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catalytic converter is clogged basically its stopping up your exhaust. Over time the pressure will slowly vent out, allowing your car to start, only to build up the backpressure again, stalling engine.
CHECK BLOWER MOTOR FUSE AND RELAY.SEE IF POWER GOING TO BLOWER MOTOR YOU HAVE FAULTY BLOWER MOTOR.IF BLOWER MOTOR FUSE AND RELAY OKAY.IF NO POWER GOING TO BLOWER MOTOR BUT POWER AT AC AND HEATER CONTROL SWITCH. BLOWER MOTOR HAS POOR GROUND OR AC AND HEATER CONTROL SWITCH IS BAD.
Not familiar with your Merc. This is general info. My porsche has a mecanical belt tensioner down low under the engine off the ground. Toyota has a spring charged piston pushing a belt tensioner wheel. Most other cars I've worked on had a pivoting alternator. If your car has a flat serpentive belt then it probaly has a spring loaded tensioner. If it has Vee belts then something sets the tension mechanically at install. Good luck!
In older vehicles, sometimes the heat blower stops and goes due to a loose plug or miss contact. some people have to "kick" or "bang"around the blower area to get them back to work every time. have someone take it out and clean the electrical connections.
hope this helps...
Disconnect the battery and do a continuity check from the heater fuse to ground. It will probably be a short. If so do a physical check of the wire(s) from the heater to the fuse. Look at any place where the wire(s) bend and any place where it's possible for the wire to vibrate against metal even if you have to cut tape and pull it out of a bundle to follow it, retape it later. I have faith in you finding a burned wire, good luck.
if you can reach the blower motor, it could be a worn out carbon brush of the blower motor. if they are, buy a set of carbon brush, learn how to replace them and it would be back running in no time. by the way, when you pull out the carbon brush holder, make sure you dont interchange the position. you can put them back wards and what would happen is the rotation will be reversed. either you reversed the carbon brush holder or just simply interchange the wires that are coming to the motor. i hope i was able to help...
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