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#46
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Quote:
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#47
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On the 190D its right next to the Klima, behind the battery and the battery cover semi under the windshield.
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--------------------------------- 87 300SDL 87 190D 2.5NA 5sp 90 300GD with 606 turbo! 08 GL320 CDI 12 ML350 Bluetec --------------------------------- Past rides: 82 300SD - the one that started it all! 81 240D 87 300SDL - the first one. 92 300D 2.5 Turbo 99 E300 Turbodiesel 07 E320 Bluetec 12 S350 Bluetec |
#48
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I have no pin 4 so what would be the alternative place for me? I could care less about any protection crap - engine overheating, compressor seizing - let the damn thing burn - as long as I have my A/C working!
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--------------------------------- 87 300SDL 87 190D 2.5NA 5sp 90 300GD with 606 turbo! 08 GL320 CDI 12 ML350 Bluetec --------------------------------- Past rides: 82 300SD - the one that started it all! 81 240D 87 300SDL - the first one. 92 300D 2.5 Turbo 99 E300 Turbodiesel 07 E320 Bluetec 12 S350 Bluetec |
#49
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Exactly wrong. If the EDS ISN"T working correctly, you can use the relays to bypass protection. If the EDS was working correctly, you probably wouldn't be doing this. Why are you doing this, by the way? You have no pin 4, so all you need to connect is Pin 12, that's the only sense lead. Here's the relevant diagram. After this, I start charging for engineering: |
#50
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Quote:
Replaced: Heater core and Evaporator. All vacuum elements ( except for the defrost one - out of stock worldwide- and still works ) Feedback potentiometer New style switching valve. Pushbuttons Klima relay Receiver dryer with both switches. To the best of my ability I did all the tests to this system by the Tempmatic book. Tried second pushbuttons and klima relay. Grounding one wire of the low pressure switch does kick on the A/C compressor. Same with jumping pins 5 & 7. "Help me Obi Wan Kenobi you're my only hope"
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--------------------------------- 87 300SDL 87 190D 2.5NA 5sp 90 300GD with 606 turbo! 08 GL320 CDI 12 ML350 Bluetec --------------------------------- Past rides: 82 300SD - the one that started it all! 81 240D 87 300SDL - the first one. 92 300D 2.5 Turbo 99 E300 Turbodiesel 07 E320 Bluetec 12 S350 Bluetec Last edited by bentrod; 06-13-2018 at 04:35 PM. |
#51
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Damn...... nothing, no effect. Did not work
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--------------------------------- 87 300SDL 87 190D 2.5NA 5sp 90 300GD with 606 turbo! 08 GL320 CDI 12 ML350 Bluetec --------------------------------- Past rides: 82 300SD - the one that started it all! 81 240D 87 300SDL - the first one. 92 300D 2.5 Turbo 99 E300 Turbodiesel 07 E320 Bluetec 12 S350 Bluetec |
#52
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Test for basics first, make sure there is refrigerant in the system and you have adequate standing pressure. If you do, test for continuity through the pressure switch. If those things are good, you have a problem further downstream. It isn't the Klima.
__________________
Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#53
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Please expand on " further downstream" Would it be where the wiring goes in and out of the Electrical center/fuel box, continuity tests or yet another push buttons. I'm all ears. And a MAJOR THANK YOU ALL for your input on this!
__________________
--------------------------------- 87 300SDL 87 190D 2.5NA 5sp 90 300GD with 606 turbo! 08 GL320 CDI 12 ML350 Bluetec --------------------------------- Past rides: 82 300SD - the one that started it all! 81 240D 87 300SDL - the first one. 92 300D 2.5 Turbo 99 E300 Turbodiesel 07 E320 Bluetec 12 S350 Bluetec |
#54
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Study the diagram in Post 49. Pay attention to where the wiring goes beyond the pressure switch. The diagram shows wire colors and connector pin numbers. You need to follow it all the way back to the Pushbutton Unit. You should be able to test the whole system by grounding Pin 6 (blue/green) on the X1 connector on the PBU. If the clutch engages, the PBU is the problem. If it doesn't, somewhere between the pressure switch and the PBU you have an open connection.
I have no idea what the "F1 Electrical Center" is, but if it's anything like other electronic "modules" of the era, I'd be willing to be you have broken/cracked solder joints. The PBU grounds Pin 10 of the Klima relay through the pressure switch to engage the compressor clutch. Since you can ground the circuit manually at the pressure switch, you've ruled out the Klima relay and the wiring up to the pressure switch. Now you need to prove the circuit the rest of the way back to the PBU.
__________________
Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#55
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Quote:
__________________
--------------------------------- 87 300SDL 87 190D 2.5NA 5sp 90 300GD with 606 turbo! 08 GL320 CDI 12 ML350 Bluetec --------------------------------- Past rides: 82 300SD - the one that started it all! 81 240D 87 300SDL - the first one. 92 300D 2.5 Turbo 99 E300 Turbodiesel 07 E320 Bluetec 12 S350 Bluetec |
#56
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I carefully opened the harness connector, removed the wire and grounded it to a good ground under the dash via jumper wire. Bingo! A/C clutch finally came on! Nice and cold but I did not let it run for long as it seems to not cycle the compressor. Question: Is there anything that can cause or fool the PBU not to signal / ground the circuit of the A/C clutch? Or is this -- finally -- a clear cut case of a bad PBU , again. This one is only a month old rebuild from Programa ( I know - anything can fail! ) I just don't want to ship it back, they test and and say " no fault found! "
__________________
--------------------------------- 87 300SDL 87 190D 2.5NA 5sp 90 300GD with 606 turbo! 08 GL320 CDI 12 ML350 Bluetec --------------------------------- Past rides: 82 300SD - the one that started it all! 81 240D 87 300SDL - the first one. 92 300D 2.5 Turbo 99 E300 Turbodiesel 07 E320 Bluetec 12 S350 Bluetec |
#57
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Evaporator temp sensor?
Sixto 98 E320s sedan and wagon 02 C320 wagon |
#58
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But I've been wrong before.
__________________
--------------------------------- 87 300SDL 87 190D 2.5NA 5sp 90 300GD with 606 turbo! 08 GL320 CDI 12 ML350 Bluetec --------------------------------- Past rides: 82 300SD - the one that started it all! 81 240D 87 300SDL - the first one. 92 300D 2.5 Turbo 99 E300 Turbodiesel 07 E320 Bluetec 12 S350 Bluetec |
#59
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The evap temp sensor is an NTC thermistor. If it is open-circuit, it will be infinite resistance and the PBU will think you're at -100000 degrees (maybe a bit exaggerated, but you get the jist).
The good news is that you've now proven the wiring all the way back to the PBU. "cycling" of the compressor is done based on the temperature of the evaporator. If the evap temperature sensor is screwed up or open-circuit, it can cause it, otherwise the PBU is probably toast.
__________________
Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#60
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In my case its not turning on the compressor. Besides the sensor being open any other test or value I can check it for? Plus - just took a quick look and can't find the part # to a new sensor.
__________________
--------------------------------- 87 300SDL 87 190D 2.5NA 5sp 90 300GD with 606 turbo! 08 GL320 CDI 12 ML350 Bluetec --------------------------------- Past rides: 82 300SD - the one that started it all! 81 240D 87 300SDL - the first one. 92 300D 2.5 Turbo 99 E300 Turbodiesel 07 E320 Bluetec 12 S350 Bluetec |
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