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#1
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Dreaded ACC question
The car in question is an '85 300DT.
The blower has been acting up....sometimes blowing hard and sometimes not at all. This up and down behavior happens in all button modes. So I took out the blower itself and cross referenced (installed it) in my TD which has the simpler design. Blower works fine with no dead spots. Therefore, am I right in thinking that the message going to the blower is getting screwed up? Where do I start? Thanks Don
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DAILY DRIVERS: '84 300DT 298k (Aubrey's) '99.5 Jetta TDI IV 251k (Julie's) '97 Jetta TDI 127k (Amber's) '97 Jetta TDI 186k (Matt's) '96 Passat TDI 237k (Don's '84 300D 211k Mint (Arne- Undergoing Greasecar Conversion) SOLD: '82 240D 229k (Matt's - Converted-300DT w/ 4 speed |
#2
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Isn't the blower also controled somewhat by the crouton toaster in the engine compartment?
Might want to try swapping the ACC control modules and see if the problem follows it as well.
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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter. '84 300D Turbo 240k (Anthracite Grey) - Garage Queen '83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver I'm not a certified mechanic, but I did stay at a HolidayInn Express last night. |
#3
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I'll wager a bet its the Climate control (push button ) module, there are tiny little relays that carry the full current gong to the blower and the contacts get dirty and fail to carry current, you can burnish them with some sandpaper (600 grit crocus cloth?)
Then there is the well known issue of the solder joints on the connector header on the side where the plugs goes on. With all the W123 cars you have I am surprised you haven't seen this problem b4. Resolder all joints and see if that doesn't fix it. I have seen both of the above problems, as well as burned traces caused by a short that occurs when the brushes wear down to little nubs (there is a retrofit fuse kit for this). I bought a spare panel just for the purpose of substitution for this kind of problem in my W123's. The dreaded thing was underdesigned from the factory INHO. Dieseldiehard 1971 220 (gas) 4-spd manual 106441 1979 300TD w/ ’85 turbo engine 295530 1983 300D 243280 1985 300TD 217300 1987 300D 258230
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
#4
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Another thing that can cause this (along with large temperature swings) is a dead foam hose to the aspriator motor for the interior temp sensor. It's behind the glove box. Replace with something like pipe insulation or heater hose and make sure the little blower motor is working.
Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! |
#5
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Thanks:
You've given me a handful of ideas, all of which I need to educate myself on. They sound like Greek to me right now which is the way of each new job. I'll charge into it today (day off) and see if I can make some progress. Note that 2 of my 5 daily drivers have the simpler design (TD and converted 240D). I don't look forward to this one. Don
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DAILY DRIVERS: '84 300DT 298k (Aubrey's) '99.5 Jetta TDI IV 251k (Julie's) '97 Jetta TDI 127k (Amber's) '97 Jetta TDI 186k (Matt's) '96 Passat TDI 237k (Don's '84 300D 211k Mint (Arne- Undergoing Greasecar Conversion) SOLD: '82 240D 229k (Matt's - Converted-300DT w/ 4 speed |
#6
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First check you should make is to follow psfreds advice. Remove the glove box liner and see if the hose is deteriorated (missing) that runs horizontally to the left of the glove box.
Good luck, |
#7
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Thanks Larry:
Will do Don
__________________
DAILY DRIVERS: '84 300DT 298k (Aubrey's) '99.5 Jetta TDI IV 251k (Julie's) '97 Jetta TDI 127k (Amber's) '97 Jetta TDI 186k (Matt's) '96 Passat TDI 237k (Don's '84 300D 211k Mint (Arne- Undergoing Greasecar Conversion) SOLD: '82 240D 229k (Matt's - Converted-300DT w/ 4 speed |
#8
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Ok:
1. The hose was shot and had a 'golf ball' size hole in it. Fell apart in my hands: a. Can I just splice a rubber hose there or does it need to be breathable? 2. By 'little blower' do you mean the blower on the low setting? If not, you lost me? Thanks Don
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DAILY DRIVERS: '84 300DT 298k (Aubrey's) '99.5 Jetta TDI IV 251k (Julie's) '97 Jetta TDI 127k (Amber's) '97 Jetta TDI 186k (Matt's) '96 Passat TDI 237k (Don's '84 300D 211k Mint (Arne- Undergoing Greasecar Conversion) SOLD: '82 240D 229k (Matt's - Converted-300DT w/ 4 speed |
#9
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Well, I installed a piece of pipe insulation but it didn't affect the way the unit is malfunctioning....bummer.
I'll have to move on to more sophisticated stuff. I do have another ACC unit out back that I can swap into it, but the way it appears now is that: 1. each time the unit is turned on to full blow it works for about one minute. 2. then it fades until it functions at either 'no blow' or 'low blow'. I'll take any other ideas. Thanks Don
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DAILY DRIVERS: '84 300DT 298k (Aubrey's) '99.5 Jetta TDI IV 251k (Julie's) '97 Jetta TDI 127k (Amber's) '97 Jetta TDI 186k (Matt's) '96 Passat TDI 237k (Don's '84 300D 211k Mint (Arne- Undergoing Greasecar Conversion) SOLD: '82 240D 229k (Matt's - Converted-300DT w/ 4 speed |
#10
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Don,
The answer to '1a' is that the foam line needs to be replaced by foam pipe insulation to keep the air in the line at the temp of the cabin not the hot underdash area. Not sure about '2'. as I didn't understand that either. Looks like we posted at about the same time.
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1961 190Db retired 1968 220D/8 325,000 1983 300D 164,150 |
#11
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The "little blower" is the one to the right-side of the glove box (compartment removed) that the garden size hose is attached to. It is clipped to a holder and can be easily removed. Once in hand, you can observe if the motor/fan is turning. Additionally, with the hose off you can see if it generates reasonable suction (holds a small piece of paper while spinning). When working correctly, the sensor grid (ceiling area where the interior light switch is) should also hold a small piece of tissue. These above were all passed on to me and others from LB and others here on the forum. Good luck and keep us updated.
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Steve '87 300TD - 132K - Soon 4-Sale '84 300D Turbo - 122K - Driving '77 VW Type II - 77K - Restored '08 250EX Ninja English Bulldog (Brier) - My best friend. Passed away 12/02/04 while in my arms. |
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