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Re: Mercedes 300E 2.8 Liter
Your library may have the diagram. Does any speed work? If it runs on full, there is a resistor pack in the fan housing that can be changed. This unit may also have multiple fuses controlling it. Merc has a habit of building the most difficult cars in the world to trouble shoot. Good luck, sir.
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Under the hood in back right corner-open fuse box and I believe it is #7 But you have 2 other fan fuses. Directly in front of the fuse box is a small black plastic box that has a fuse as well. My Mercedes has had the same problems. I recently had the ac fan blower motor changed and I now have a working panel of buttons. The 1987 300e also has reports of the control heads in the temp control buttons having to be replaced. so far- I have had my temp sensor,fan blower motor changed and no problems.
check your buttons lift centerconsole look for bare wires cap or tape up. get buttons at junk yard or try to fix yours get goo gone open switches with small flat head clean springs and ball bearing. be gentle plastic insides break easy these switches break all the tim e go to junk yard and stock your pockets full
Hmm, a problem that I have not encountered before. My best guess is that some component within the heater setup is getting overheated and then it shuts off to avoid further damage. If the heater runs each time you start the car and then turns off during your travels, then this might be the case.
Secondly, there are circuit breakers located in the fuse box. These are silver and are about twice the size of a standard fuse. Unlike a standard fuse that blows once and is done, circuit breakers get hot and "trip". After they cool down the connection is made again. Look to see if a circuit breaker (sometimes labeled CB) is in the fuse box and serves the heater. You may want to get a new one.
Its your blower motor. Check the strip fuse (30 amp) outside the fuse box in a tootsie roll sized clip case by the strut mounts. In between the fuse box and strut mount. If not you may need a regulator or new blower motor.
If the low speed fan doesn't come on, but the system works when cooling air is blown through it, that says that whatever temperature sensor is used is working. It also seems that, if the fuse is OK, then the switch for the fan isn't working. There should be a switch module down there near the fan (you'd see wires from the fan to a harness, and it'll plug into a module). I'd be willing to try replacing that switch and see if it solves the problem.