Turning on the heat in a W114.... - Page 2 - Mercedes-Benz Forum

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post #11 of 17 (permalink) Old 11-09-2004, 06:07 PM Thread Starter
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RE: Turning on the heat in a W114....

Thanks you two! The information is helpful and I will probably use an electrical probe I have to see if I can get power to the fan mentioned through its leads....eventually, as I don't have a garage and as the temps drop, I am less inclined to play outside.
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post #12 of 17 (permalink) Old 12-22-2005, 04:31 PM
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RE: Turning on the heat in a W114....

I know that this is late in the game, but for posterity sake I thought that I would post. Your system is likely like my '75 240D set up. The barrel fan set up in the cabin center console is for the a/c only. For heat, there is a separate fan that has an interconnect on the fire wall inside the engine (good test point). I have the same problem and notice that the a/c system is under control of the fan switch when the a/c switch is on and there is sufficient vaccume to trigger what ever it is that is making the noise inside (flap?). Just more info that I have found.
HTH
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post #13 of 17 (permalink) Old 12-25-2005, 10:20 AM Thread Starter
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RE: Turning on the heat in a W114....

No worries about lateness. Truthfully, I still haven't managed to figure it out. There is a wire bundle (black, red, white....I think, it's been a while since I've been in the car) that appears to have been cut. I'm going to be posting questions and pics as to what it could possibly be later on. I hope that it's not the lingering presence of a fan motor that used to be there. It's on the underside of the passenger side. I discovered it once I removed the underdash panel[:(]

Thanks for the additional info though!

1973 280C, Weber 38DGES carb conversion-GONE. 1983 380SEL-GONE.
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post #14 of 17 (permalink) Old 01-14-2006, 02:42 PM
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RE: Turning on the heat in a W114....

I had a '73 280C and the heater blower only came on when I turned on the AC ('colder' knob). After some investigation, I found that was the normal design for the car.
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post #15 of 17 (permalink) Old 01-14-2006, 04:25 PM
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RE: Turning on the heat in a W114....

On my '72 250C, the only time fans come on is when I use the rotary "defrost" knob on the dash and the A/C "colder" switch. With the A/C and defroster fans off, the only air coming from the round and rectangular dash vents appears to be force-fed from the movement of the car.

Scott
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post #16 of 17 (permalink) Old 01-15-2006, 03:13 PM
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RE: Turning on the heat in a W114....

Looking thru the CD Rom manual I kept, there's an interlock that gets actuated when you turn the AC on - it's required to get the heater blower motor going.
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post #17 of 17 (permalink) Old 01-16-2006, 09:49 AM Thread Starter
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RE: Turning on the heat in a W114....

Thank you guys! I guess that means that I have some blockage or something in the core. The blow-by heat is great! Once the fan turns on, it blows ice cold. Blah! Hope I can just flush the system and solve the problem!

1973 280C, Weber 38DGES carb conversion-GONE. 1983 380SEL-GONE.
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