BenzWorld Senior Member
Date registered: Jan 2005
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RE: 300 sel 6.5 heater motor
Is your car air conned?,you must remove the aircon if it is,a long job ,count on weeks if you want to remove the dash under side to get the heater out without damaging anything.
here is a basic out line on how to do the job.
1/ remove both front seats,
2/ remove the steering column,
3,remove the glove box,
4/ remove the aircon ,
5/ remove the radio,
6/ remove the speaker grille,
7/ pull the ends of the heater control knobs off.
8/with the glove box out,you should be able to see the aircon evaporator,remove the two hoses from under the hood and the undo the two brackets on top of the evaporator,pull the electrical plug off the evaporator and remove the evaporator.9/ remove the electrical plugs from the heater controls,there are three,one for lights ,one for heater motor control and one for fan control.remove the clips on the heater housing that hold the control cables in place.
10/reaching up through the radio slot ,there are two 9mm nuts on the heater control bezel,remove these and reaching down through the speaker grille hole you can remove the heater controls.
11/ Remove the two heater hoses under the hood from the rear of the engine.
12/on the heater box there are "sometimes" two brackets holding the heater to the firewall,these are fitted with 10mm nuts.remove these.
13/the heater housing should now be ready to remove.
shake it vigourously to loosen the gasket on the heater fan motor.
14,the gasket will rip so count on buying a new one,the heater will tilt over to the left side of the car to get it out,once it's out,flush the core,repair any leaks,replace any foam rubber door seals and replace the motor.
reassembly is a reverse of the above.[:)]
I find it easier to undo all the various clips and so on that secure the loom to the car,there is no need to worry which cables go where because all the plugs are different.
All 6.3's are different also ,so the above is only a rough guide.