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#1
01-21-2008, 09:48 AM
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Heat - choice of all or nothing
Heat issue on my 300cd. I have two choices on heat. All or nothing.
As I move the dial it will produce great heat on the Max setting, but as soon as rotate it out of max, it cools off, and I am back to ambient air in 30 seconds. I have no heat control unless it is on the Max setting. Does that sound like a rhestat solder problem.....Just guessing.
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85 300CD Turbo "Das Polluter" 230K sold for $3,000 98 BMW 323is 
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#2
01-21-2008, 12:42 PM
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I would check the foam tube that goes from the temperature sensor to the opening (on a W126 it is in the middle of the dash). If it has deteriorated you will pull warm air from the inside of the dash into the sensor and it will shut off the heat. That is what happened in my 300SD. I replaced the tube with a piece of foam pip insulation wrapped in electrical tape and it has worked for two years.
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#3
01-21-2008, 01:37 PM
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Quote:
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o)
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#4
01-21-2008, 01:41 PM
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Check the mono valve also.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 TD Turbo, chipped. Still needs EGR Delete, 228K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#5
01-21-2008, 02:14 PM
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I have the same problem too with super hot, or nothing. Thanks for the help!
BTW, I have over 30,000 miles on a LoveCraft system. 
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34,000 miles on Recycled Vegetable Oil since June 2006 http://farm3.static.flickr.com/2018/...c7c11581_m.jpg
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#6
01-21-2008, 06:14 PM
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I had that problem and replaced the climate control unit and now much better. Found a reconditioned one on eBay that works pretty well (fingers crossed). Was around $100 I think. Easy plug 'n play replacement, too. Probably I'm just lucky that it wasn't the mono valve and I would have wasted $$ on the CCU when I didn't need to.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1982 300D, anthracite grey, 260k miles, Greasecar 1999 E300D, black, 160k miles, Greasecar 2010 Honda Insight Hybrid http://www.chuckwyatt.com http://www.wordimpressive.com
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Linear Mode
