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1980 300td HVAC bypass question
I have a 1980 300TD and have been driving it for 3 years with no working HVAC. The only setting that works is the defogger setting on high and cranks out good heat (i could care less about AC for the summer). I don't want to troubleshoot the system and there's parts missing to the servo unit under the hood. Is there a way I can access where the vents close in the duct work and make the defogger setting blow out the upper and lower vents also? Basically looking where to access that area and just take out whatever closes off the vents from the defogger.
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2022 Nissan Frontier Pro4x 1990 Mercedes 420SEL 1950 Packard 8 Previous German cars- 2001 Mercedes SL500 1983 Mercedes 300SD 2011 BMW 328i (manual) 2008 BMW 535xi (manual) 2006 BMW M3 (manual) 1980 Mercedes 300TD 2006 BMW 750i 1996 Mercedes E300D 1994 BMW 740i 2006 BMW 330xi (manual) 1999 E300DT Smoke silver/black 253k 2012 BMW 535i Xdrive M-Sport 1984 300TD-T 304k 1988 Mercedes 560SEL (parts car) 2010 BMW 550i xdrive 2017 Audi A4 Presitge 1979 300SD 313k 2003 E500 189k |
#2
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There is no way to do this....unless you buy the unwired kit or fix the HVAC system.....there's a computer that controls the servo, and the servo controls the vent operation.....what is missing under the hood?
This will tell you everything you want to know about the evil servo system.. http://www.imperialclub.com/Repair/Lit/Master/281/cover.htm If you want to get it going on the cheap, this guy has a working amp and servo....it doesn't look like its the aluminum version, so you would still need to watch for leaks......you would also need to unplug, unfreeze and fuse your aux water pump as this usually kills your amp.....then there is also a foam sensor tube behind the glove box that rots to dust that needs replacing.... http://www.benzworld.org/forums/sale-wanted-trade-giveaway/1734553-f-s-78-300d-n-engine.html There is also a chance, that all you need to get yours going again is a new amp, sensor tube and fix the aux water pump...
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Last edited by cooljjay; 09-09-2013 at 03:26 AM. |
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OK thanks for the info. For the amount of time I drive it (not much in the winter since I run both my 123 and 126 on WVO) I'll just use the heat from the defogger. Thanks for the info anyway.
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2022 Nissan Frontier Pro4x 1990 Mercedes 420SEL 1950 Packard 8 Previous German cars- 2001 Mercedes SL500 1983 Mercedes 300SD 2011 BMW 328i (manual) 2008 BMW 535xi (manual) 2006 BMW M3 (manual) 1980 Mercedes 300TD 2006 BMW 750i 1996 Mercedes E300D 1994 BMW 740i 2006 BMW 330xi (manual) 1999 E300DT Smoke silver/black 253k 2012 BMW 535i Xdrive M-Sport 1984 300TD-T 304k 1988 Mercedes 560SEL (parts car) 2010 BMW 550i xdrive 2017 Audi A4 Presitge 1979 300SD 313k 2003 E500 189k |
#4
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Alright.....just remember if that old plastic servo cracks, the effects is overheating and typical ruining the engine.....keep an eye on it!
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#5
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The engine overheats if the servo cracks? Is that because coolant leaks out of the servo?
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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes 1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die." |
#6
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Totaly hacked up and custom redisigned? Yes! But definitely doable IMO
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#7
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Quote:
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Now to us tinkers, who don't want to spent 700-1500$ to get it running right....we could figure out a cool redesigned idea....I often want to find the unwired kit, and see what they did and construct a cheaper solution say for a few hundred bucks....and offer it up... I was lucky and found a new aluminum servo on eBay for 50$ and a new amp at pick n pull.....then I bought a good aux pump...piece of foam insulation and for maybe 80$.....my servo system was fully functional....minus the ac...
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#8
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I took it as... The OP is wanting to have a a system that is permainantly fixed into one position not to have any control over the system other than simply on max fresh air or off. i say it can be done fairly easily.
"fairly easily" is a relative viewpoint I guess. All depends on time, ability and what is an acceptable level of hack up. - Disable all vacuum pods and physically "jam" them into the desired position - Plug all the vac lines to avoid leaks - Bypass hot water to the heater core (sounds like this might already be done) - Done Push the defrost button and there'll be fresh air blowing from all vents on max blower. The UT kit is simple also. Basically two three way vacuum switches,micro processor, vacuum controlled hot water valve,wiring harness and a few vacuum conection pieces to get it all hooked into the original system. I don't know what they're selling for these days but i feel like it's been worth the $550 that I paid. Yeah no fresh air control build in but it's not too bad to have Always fresh air and it's easy to add a very small ball valve to gain control of the fresh air function.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#9
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The other option is to get a complete manual system from a 240. Yes it is a lot of work, but this solves ALL the problems with the CC system.
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#10
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I am seriously contemplating this....but I am not sure if my car is worthy of such a swap.....but every time I do a coolant flush, I look at all the heater hoses....rubber and metal, plus all the vacuum lines....and electrical....I am like its just to much crap....then I look at all the ac stuff....I am like, if I just remove everything and go manual with out ac.....I would lose like 100lbs of extra weight....but on the other side, I find the acc system...so interesting, I love the flaps...all the buttons, the noises....just so cool, in a geeky mechanical way
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#11
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Going manual is a great solution. Did this on my '80 CD several years ago to finally be rid of the curse of the evil servo. Just swapped over the entire hvac cabinet, controls and wiring from a 240d parts car. Wasn't so bad - looks a lot more difficult than it really is. The results were worth the effort. With the dash out and the cabinet removed you have great access for adding soundproofing, too. Recently I complimented the upgrade with Rollguy's Sanden package; couldn't be more pleased (a/c is a major priority around here!). Be sure to check out the heater coil before you put everything back together. -- Ch
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#12
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Quote:
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#13
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$20 worth of parts will 'manualize' it and get you 20lbs lighter.
Toss the evil servo in the trash and use switches to turn on vacuum valves for vent pods, a switch to turn the AC compressor clutch on and a switch for the coolant valve for heat. I've done this on a few cars that PO had hacked up beyond repair. If you want to do it really cheap just let the vacuum lines hang down and connect the vacuum source to the desired pod to steer the air... dash vents in summer and floor in winter. Default is defrost. Manual water valve under the hood for coolant flow for winter mode. Use a DPDT with center off switch for blower "Low" speed thru resistor, center "OFF" and up position for "Hi". |
#14
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Just prop open the footwell vents. Not that hard to do.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
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