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  #16  
Old 12-17-2008, 11:49 PM
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For the money spent on the servo and other installation and diag, you could have bought the digital servo and been done with it and have a working system.
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  #17  
Old 12-18-2008, 01:20 AM
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You just had to rub it in, didn't you.
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  #18  
Old 12-18-2008, 06:46 AM
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Quote:
Originally Posted by JimmyL View Post
That servo amp is very likely your problem. I've never pulled one out of a car at the yards that wasn't fried. Most of them you can see the burned area!!
I hope your mechanic fused your aux water pump. If not you need to do that or have it done.
I need to start pulling these things......*daw makes notes*
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  #19  
Old 12-18-2008, 09:21 AM
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... I have a 78 D and an 80 TD... parts cars if you're needing something...
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  #20  
Old 12-18-2008, 09:47 AM
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Okay, so I got the part number, and it turns out it's the evaporator temp switch, also known as the "de-ice switch" because it kicks the compressor off if the evaporator is froze/too cold to prevent the compressor from killing itself.

I'm actually leaving for Indy in a little bit, but once I get back I'm going to pull the amplifier and see if that also might need replacing, otherwise it's the evap. temp switch that I'm looking for. Fastlane has it, but here is the part number anyways: 003-820-24-10.

Thanks guys!
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  #21  
Old 12-18-2008, 11:19 AM
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Quote:
Originally Posted by derburger View Post
George Murphy sells rebuilt servos and amplifiers, and vacuum diaphragms. IIRC, a rebuilt amp from him is around $100.

Used working ones are $30 shipped on ebay. Search "Mercedes climate amplifier" to find them.



They look like this.

I had to deal with fixing the servo climate control system, and it completely works (it's nice!) so if you need help feel free to ask me. There is a learning curve on ACC work, particularly the older version.
Do you know if a failed amplifier will cause the blower to stop blowing? The blower is not blowing on my 116 right now and I'm trying to diagnose it. I haven't been able to get good enough access to check the voltage at the blower motor yet, and the amplifier is far more accessible. Do you know if I can check at the amplifier for voltage to the blower?
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  #22  
Old 06-05-2009, 01:08 PM
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Okay, sorry to bring up a dead thread but I am bored and want to try something. How do I "jump" the compressor to see if I can get it to come on? I just want to try it to see if it works, I have a CCU on the way but if it's not too invasive of a process I'd like to give it a try.

Any tips/how-to's on what to do? It's getting hot here!
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  #23  
Old 06-06-2009, 12:07 AM
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Applying 12 volts to the compressor clutch will make it come on But, without having a temp switch on the evaporator to shut it off at 32* it will turn into a block of ice.

-Jason
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  #24  
Old 06-06-2009, 01:06 AM
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^I'm trying a new CCU, then the temp switch. I tried to jump the low pressure switch on the evaporator today to no avail, so I just wanted to make sure my compressor came on at all. I guess I will just wait so I don't have a ton of extra wires everywhere from the jump to the compressor. I was going to do it more as a test anyway.

One place I took it to seems to think it's the CCU, the other the temp switch. If neither of those work then I'll try relays. If that fails, then poop.
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  #25  
Old 06-06-2009, 04:14 PM
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Okay, I got the compressor to come on today. I jumped the evap temp switch, and sure enough it switched on. I still think the CCU is bad though, because it will still only blow out warmish air, which is what an indy here told me might be the problem. However, I will also need to recharge the system as well so that might do some good in terms of cooling things down!

Hopefully that'll do it! I'm pretty happy I got it working today!
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  #26  
Old 06-06-2009, 09:52 PM
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You sure what you jumpered was a temp switch? If the charge level is too low there's a pressure switch that will keep the AC from coming on.

-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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  #27  
Old 06-06-2009, 10:56 PM
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Unless something happened over the past few months , the ac Should have a charge. My guess is it's trying to cool hot air.
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  #28  
Old 06-06-2009, 11:19 PM
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Quote:
Originally Posted by TylerH860 View Post
... My guess is it's trying to cool hot air.
That's what my AC does.

but anyways I dont have any experience with these servo thingys, so good luck..........



( maybe a heater valve out of an older vehicle and a choke cable mod to control coolant flow- that would be my fix if I was faced with a $1K plus repair bill on one of those units. )
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  #29  
Old 06-07-2009, 01:09 AM
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^Well the servo is brand new (well, rebuilt) so right now I'm going to rule that out as a problem. I've replaced the amplifier,and I have a CCU and a new evap. temp. switch on the way.

I have noticed that my center vents don't work but are hooked up to the vacuum pod, and the vacuum pod that closes the blower "door" doesn't close it (it tries though) and the passenger vent is less powerful then the driver vent. Could there be a vacuum leak somewhere causing all of this?? Does ANY of this sound familiar?

I'm just happy I got my compressor kicked on!
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  #30  
Old 06-08-2009, 11:12 PM
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Okay, today I went out and bought a recharge kit from Wal-Mart which included three cans of 134, a little trigger dispenser hose thingy with a gauge, and some 134 conversion stuff (but I didn't need that).

Anyway, I hook it up to take a pressure measurement like it says to do, and it shows a whopping zero. So okay, I plug in a can and empty it in to the system. Once again, nothing. I gave trusty Tyler a call, and then dumped in one more can. The gauge would jump a little, then go back to zero.

This is with the compressor on and the dial all the way in the coldest setting. Very interesting, I'm guessing I have a leak somewhere but I couldn't see anything coming out anywhere.

And to add insult to injury, I crushed my phone in the hood today. Killed it instantly. Arghhhh.
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