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#31
05-16-2013, 01:10 AM
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__________________
 Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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#32
05-16-2013, 01:12 AM
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Jeremy5848
Registered Biodiesel User Join Date: Mar 2006 Location: Sonoma Wine Country Posts: 7,426 View Photos By: Jeremy5848 Fixed! I am pleased to report that with a used-but-good Klima relay (part 001 545 74 05) from SoCal Mercedes Parts and about 4 hours of work, I have been able to take the final step in returning my 85's climate control system to factory condition. A PO had dealt with the Klima relay failure by wiring around it -- a simple relay that turned on the compressor whenever the climate control system was on and calling for cold air. I had to remove the extra relay and reverse all of the wiring changes that were made. One of the things I discovered was that the "abandoned" cable I found some months ago -- someone here theorized it might have been for an alarm system hood switch -- turned out to be the original wiring to the compressor solenoid. In the beginning, the hard part was not knowing how the system was wired originally (hence my whine that started this thread). The answer, which I have uploaded here, lies in the wiring diagram and notes that the factory published in a manual entitled "Model Year 1985/Passenger Cars/USA Version/Introduction into service." This information, which is apparently unique to the 1985 model year W123 300D/CD/TD, does not appear in any other FSM of which I am aware, not even the climate control manual. According to the manual, the Klima relay has three functions: (1) when the engine is started, the relay keeps the compressor solenoid off until 10 seconds after the engine speed has reached 600 RPM. This "improves engine speed stabilization after startup." (2) with engine speed less than 1050 RPM, when the accelerator is floored, the compressor solenoid is released until the engine reaches 2150 RPM or the accelerator is released. This function is controlled by a microswitch on the valve cover (I thought that microswitch was the kickdown switch -- it is not). (3) if freon pressure is lost, a pressure switch tells Klima to turn off the compressor solenoid, saving the compressor from damage. None of these functions work if you have a work-around relay in your system. The Klima relay is connected to the EGR controller (that's how it gets the RPM information, I suppose) which is hidden behind the passenger's righthand kick panel. This probably means that the relay will not work if the EGR controller has failed; a clue might be loss of tachometer function. It also means that, when removing EGR parts "for testing," you want to leave the EGR controller in place and connected. Jeremy
__________________
Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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#33
05-16-2013, 01:43 AM
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Quote:
The suction side sucks, so should have some, right? I.I.R.C. was about 0P.S.I. and went to 20 P.S.I. with on 15OZ of R134a. The auxiliary fan, sorry. It NEVER comes on even when I over heated the engine... Es ist kaput? Clutch huh? That is interesting, as bypassed the Klima and it did nothing.
__________________
Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
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#34
05-16-2013, 02:01 AM
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__________________
Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
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#35
05-16-2013, 02:05 AM
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Quote:
__________________
Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
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#36
05-16-2013, 10:00 AM
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Adriel,
My suggestion: Disconnect compressor clutch coil plug and jump the coil directly with a homemade harness consisting of (2) spade terminals to which you can supply the clutch with power and ground externally. You can verify the ground side with your DVOM. Engage compressor, set blower controls to A/C/High and allow the system to stabilize. Watch your sightglass AND gauges. Report back to us with your pressures and let us know if the vents are delivering cold air. Once we know the clutch works 100% with external voltage AND the pressures are within specification, then we can go from there with diagnostics....
__________________
Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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#38
06-08-2013, 11:44 PM
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The Peach finally let me log on...
Somewhere I read how to by pass the relay. I did this and changed nothing until... well, background first. I did this and later went to the airport parking garage and left for the late May trip. Came back, and the A/C worked!  All I can figure is there was two 5 M.P.H. speed bumps labeled 15 M.P.H. that really shook the Mercedes going in and out of the garage. In the past, going over a REALLY large bump could make it work. Leaving it for now as it works. However, some point like to figure out the why. Any thoughts?Vent temperature got below freezing so something is working. Now like to get the high side pressure down by getting the auxiliary fan to come on. I can't find a wiring diagram for a 1985 wagen. I know the relay plus the block and dryer sensor(s)/switch(es) are good. So either the the resistor or the fan is bad. Just stuck on proceeding. Anyone install the two fan set up from a W124? Just thinking is all!  
__________________
Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
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