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  #61  
Old 06-17-2018, 01:38 PM
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The NTC thermistor increases resistance as temperature falls. If it is open circuit, the PBU thinks the evaporator is at an extremely low temp.
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  #62  
Old 06-20-2018, 03:18 PM
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Quote:
Originally Posted by Diseasel300 View Post
The NTC thermistor increases resistance as temperature falls. If it is open circuit, the PBU thinks the evaporator is at an extremely low temp.
My sensor was about 14.00 ohms. I got another one - new style W201 that is has the metal casing and ohms at just under 7. I tested them both at the same time, same outside temperature.
Still no compressor kicking on.
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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
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  #63  
Old 06-20-2018, 10:42 PM
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You have a PBU problem from the sound of it. You already know that grounding the pin at the PBU turns on the clutch, you know the Evap sensor is good, the PBU is all that's really left at this point.
__________________
'11 Honda Accord EX - "The Daily" 60K
'83 500SL Euro - "The Money Pit" 116K
'86 300SDL - "The Diseasel" 184K
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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  #64  
Old 06-21-2018, 09:56 PM
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Quote:
Originally Posted by Diseasel300 View Post
You have a PBU problem from the sound of it. You already know that grounding the pin at the PBU turns on the clutch, you know the Evap sensor is good, the PBU is all that's really left at this point.
I got the PBU already sent out via UPS. Stay tuned for the installment!
__________________
---------------------------------
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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  #65  
Old 07-07-2018, 03:21 PM
bentrod's Avatar
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This has become a nightmare.....
Okay so the first set of replacement PBU arrived in a box that was driven over, the tire print looks like a forklift tread, not joking. Contents smashed. ( Never use the USPS for anything of value! )
Next replacement send via UPS. Box looks good. Strike 1 - all the airflow buttons are depressed?! Strike 2 - there is a rattle inside if you shake it. Not like its something completely loose and rolling to one side to another but as if its contained in a small area, like a a baby toy rattle.
What a heck lets try it. I push around the buttons some and they spring back out.
Plug it in.........................Strike 3 - Still. No. Compressor.
Helppppppppppppppppppppppppppppppppppppppppppppppppp!
__________________
---------------------------------
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
Reply With Quote
  #66  
Old 07-09-2018, 07:00 PM
bentrod's Avatar
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Join Date: Jan 2016
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Is there any other way to test the PBU and or the ground as to where it grounds the A/C compressor clutch?
__________________
---------------------------------
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
Reply With Quote
  #67  
Old 07-09-2018, 07:58 PM
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Join Date: May 2016
Location: Texas Hill Country
Posts: 3,598
You already tested all the wiring up to the PBU and it'll engage the compressor when grounded. That rules out everything up to the PBU. There's something in the PBU that's preventing engagement, that's as far as I'm useful in helping on this matter since I'm not familiar with the operating conditions of the W201 PBU.
__________________
'11 Honda Accord EX - "The Daily" 60K
'83 500SL Euro - "The Money Pit" 116K
'86 300SDL - "The Diseasel" 184K
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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  #68  
Old 07-09-2018, 08:15 PM
bentrod's Avatar
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Join Date: Jan 2016
Posts: 125
How about where does the PBU get its ground from?
__________________
---------------------------------
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
Reply With Quote
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