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#1
12-20-2004, 11:21 PM
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no heater = no visibility
I just bought a 1991 2.5 turbo mercedes so i can start burning biodesiel. It seems to be a great car despite it's 200k miles (it looks like new) - but the heater motor does not work. These Mercedes seem to be a very automated car - especially the heating system or climate control as the german engineers like to call it. Here's the symptoms:
1) the heater motor does not work under any conditions 2) the temperature control dial does not seem to have much effect on the small amount of air that comes out of the vents. It always seems to be warm even when the dial is turned to a low setting such as 60 degrees. Would it be prudent to replace the heater fan motor (it I could find it) or should I be considering some problem with the control unit somewhere? thanks in advance, Dino 
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#2
12-20-2004, 11:46 PM
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I assume it is a
300D Turbo 2.5
Replace all fuses, if that fails: The blower motor and/or regulator is 90% likely the cause. 1991 Mercedes Benz 300D Turbo 2.5 Part: Heater Motor 1991 Mercedes Benz 300D Turbo 2.5 Part: Blower Regulator
__________________
ASE Master Mechanic https://whunter.carrd.co/ Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 2003 Volvo V70 https://www.boldegoist.com/ Last edited by whunter; 07-28-2010 at 05:59 PM.
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#3
12-20-2004, 11:54 PM
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It is in fact a 300D 2.5 turbo
 It is in fact a 300D 2.5 turbo
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#4
12-20-2004, 11:57 PM
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Please edit your
User CP
Location is a big help, we may know a local garage or member who can help. Oops I edited my first post = added much more data. Hmmm What was engine temperature??? The CC will not allow blower to come on if engine is below 30C... Last edited by whunter; 12-21-2004 at 12:13 AM.
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#5
12-21-2004, 12:13 AM
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engine temp is normal
I'll check that fuse located on the left wheel strut (from another thread). The engine temp is right where it should be. Do you have any idea where the heater motor is on this 91 300D 2.5 turbo?
thanks, Dino 
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#6
12-21-2004, 12:24 AM
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Under the Mono blade windshield wiper..
Quote:
Remove the bezel, mid engine false bulkhead and motor cover to access. Labor is roughly one and a half or two hours for a mechanic. This is from memory, and I am very tired, will try to check service information tomorrow.
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