1976 240D Question - Mercedes-Benz Forum

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post #1 of 7 (permalink) Old 01-12-2007, 11:14 AM Thread Starter
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1976 240D Question

Hi All,

This is my first post and I'm wondering if anyone can give me some pointers. I'm looking to buy a 1976 240D, body is pretty good, as are the floor pans and jack points. However, there's no heat. Am I correct in assuming that this might need a heater core replacement? If so, that's about $450-500 right there in parts alone and I'd like some leverage in bargaining on the price. Any help would be greatly appreciated!

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post #2 of 7 (permalink) Old 01-12-2007, 12:33 PM
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Welcome to BenzWorld! It's pretty hard to say why no heat, but a failed heater core seems unlikely, since they are usually replaced only when leaking.

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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post #3 of 7 (permalink) Old 01-12-2007, 01:14 PM
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The heater valves or cables may be broken. Do the valves attached to the cables on the firewall move when the left and right heater sliders are moved?

1977 - W116 - 6.9
1974 - W115 - 240D /8 - 4(M) OM617.910 + Turbo + 300D FW - Completed 7/8/10
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post #4 of 7 (permalink) Old 01-12-2007, 01:29 PM Thread Starter
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I'll check it out

Going to look at it tomorrow, I'll check the heater valves and cables but I'm probably going to buy it anyway as it's a sweet little car.
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post #5 of 7 (permalink) Old 01-13-2007, 10:12 AM
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Check your fans too. I believe the 115 chassis has a seperate fan for heat and one for AC. If fan needs replacement, you will learn all too well about the front dash of that ole bear.

If the heater fan does not work you will get heat (when you fix the mono valves) it should "lob" in there at good highway speed by natural aspiration. But if it is real cold (less than 20 degrees F) you need fans. Plus the defroster works best with the fan functioning too.

1979 240D
courting a 1972 220D
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post #6 of 7 (permalink) Old 01-13-2007, 04:26 PM Thread Starter
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Bought it!

Just drove it back from an hour away without a hitch, runs great. Looks like I'll be a regular here in the future! Can't wait to get to work restoring it. Turns out it's actually a '75, what a sweet ride (acceleration is not bad at all).

Thanks all,
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post #7 of 7 (permalink) Old 02-11-2008, 06:46 AM
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What did you learn about your 240D heater ?

I also just purchased a clean little 1975 240D, a Texas car with zero rust and rebuilt motor, but the heater blows cold as a stone... the fan works and the heater control valve under the hood operates and gets hot. The hoses from the control valve also appear hot but there is zero heat coming from the heater vents in the dash. Is there a flap that directs air from heat to A/C that could be stuck, or I also saw mention of a seperate electric water pump that feeds the heater in another post... Did the 240D have a seperate pump feeding the heater system ? Any help will be a appreciated. John
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