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#1
08-17-2008, 09:25 AM
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heater seems always on -76 300D
Even here in the great white north the mercury can be in the low 90s in august.
My newly acquired 76 300D runs great but I always seem to get a flow of warm air on my legs (and the passenger's legs also). The fan-defrost work great and I get a good flow of cool air on face and windshield but always warm air on the legs despite the correct position (according to owner's manual) of hvac controls. Car does not overheat, temp gauge stays at 185 when warmed up. Any ideas? Last edited by bluebenz; 08-17-2008 at 09:44 AM. 
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#2
08-17-2008, 09:41 AM
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a hole somewhere in the firewall.Like maybe the rubber cover that is for the steering column.or one of the smaller holes for an accessory,maybe their sealing grommets are bad.
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#3
08-17-2008, 10:37 AM
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I'm wondering if you're sure it's warm air out the top vents or if it's just blowing by you that it "feels" cooler than what comes out the bottom. I'm guessing you have a bad valve or vacuum leak at the vent controls. I'm far from an expert on this but had a similar problem.
Can someone else comment? Bill
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'87 300SDL, intensely modified Greasecar setup, with nickle plated heat exchanger, 3 valve setup, 312,000 miles '95 Suburban diesel, Greasecar basics, 16 plate heat exchanger, mercedes fuel lines, Racor filter '85 Renault Alliance converted full electric vehicle
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#4
08-17-2008, 04:34 PM
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Quote:
Possible but unlikely as the passenger also gets warm air at the legs...
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#5
08-17-2008, 04:35 PM
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Quote:
It's definitely cool air at the top vents and warm air at the bottom...
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#6
08-17-2008, 09:28 PM
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I would suggest you try this question in the Vintage Mercedes section. There is not a lot of 115 knowledge here in the Diesel section. Climate control on those is quite a bit different from the later models.
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Palangi 2004 C240 Wagon 203.261 Baby Benz 2008 ML320 CDI Highway Cruiser 2006 Toyota Prius, Saving the Planet @ 48 mpg 2000 F-150, Destroying the Planet @ 20 mpg TRUMP .......... WHITEHOUSE HILLARY .........JAILHOUSE BERNIE .......... NUTHOUSE 0BAMA .......... OUTHOUSE
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#7
08-17-2008, 10:54 PM
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Stupid question: Is the fan on when this happens or the fan off while cruising?
Also, could you take a picture of your ac controls. If this is the older controls, there is a lever in the middle that controls the ouside air. If so, this will always be cooler air. If heat comes out at the bottom, the mod valve (if it has one) maybe torn.
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the sooner you start... the sooner you'll get done  If it ain't broke, don't fix it.. Its always simpler to tell the truth... 2007 Honda Accord EX 2007 Honda Accord SE V6 96 C220 97 Explorer - Found Another Home 2000 Honda Accord V6 - Found Another Home 85 300D - Found Another Home 84 300D - Found Another Home 80 300TD - Found Another Home Previous cars: 96 Caravan 87 Camry 84 Cressida 82 Vanagon 80 Fiesta 78 Nova Ford Cortina Opel Kadet 68 Kombi Contessa
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#8
08-18-2008, 11:45 AM
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Eureka!!!
Stupid me, if the 2 red levers are moved to the center, I dont get any warm air on the legs. I should have known this since this is not my first 114/115. Sorry about that, and again thanks for helping me out!
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