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#31
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There is a thread by Dmorrison about cleaning the inside of the evap where the fins are...and others have done it... but on your car I don't know which route to suggest is easier.. The other questions are not about type one AC .. only type one is simple enough for me to deal with it... that dash unit I think you are talking about... the diagnostics alone run 80 pages in the paper MB AC FSM...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#32
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This one?
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on the 1983 240D & 1982 300TD (W123) by dmorrison 6/17/06 http://www.peachparts.com/Wikka/W123Evaporator |
#33
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Thanks Roy.
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#34
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Thanks Leathermang - Thanks Roy ;)
Wow, what a great photo-essay - now THATS an involved process - one I don't think my patience will allow at this point, but a great way to understand the layout of the heating/cooling system.
Does make me wonder, though, if my evaporator looks similar, or worse; causing the lower than one would expect airflow... esp since by design, the regular use of the AC system would keep the evaporator washed clean (theoretically), but when the system has been dysfunctional for many years, lord knows. Dang, too bad the fins don't face to allow one to drop the fan, and hit 'er with a garden hose and squirter (tongue in cheek - but farm-boy thinking...) 'course, it does have a drain out the bottom, yes/no? |
#35
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yes, has drain and you had better make sure it stays open..or a terrible fish smell can overtake your car.... I have thought about examining to see if there is some way to stick a garden hose down the center vent.... to avoid that nightmare procedure doing it correctly....
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#36
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Quote:
Quote:
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#37
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That was not a theory... it was magical wish fullfillment pain avoidance thinking...
I think the book flat rate manual is 17 hours for taking the dash off.. and we had one college student in Florida that did it twice in a row... shudder....
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#38
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Give that student an A!
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#39
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I gave him an OCD.
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#40
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LOL - Thanks - I needed that!
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#41
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Did a full re-solder and sanded-polished relay contacts in the CCU today. Wow, it does things I never knew it would do - seems to work great. The 2 buttons next to off didn't run the fan - now they do...
PLUS - the fan seems to run faster than before - but that's an un-scientific opinion. Back to the AC: I'll order up a new expansion valve, as mine is confirmed to have a small leak. It also still has this issue: the clutch doesn't seem to want to engage - at least positively, unless I jumper around the low pressure switch on the dryer. Should I, perhaps, just order up a new switch, so as to eliminate that as a potential problem? It wouldn't run mid-week, so during diagnostics, I jumpered around the switch, and it ran (clutch) every time. The tech hooked his gauges up, and the 'relaxed' pressure was around 60 lbs - shouldn't that be enough to let the clutch engage? (confusion is the tech says the switch is fine:| ) Last edited by Goldenvoice; 06-28-2011 at 12:43 AM. |
#42
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Quote:
Quote:
10 psi should be enough to close the switch. |
#43
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The expansion valve: sniffer picked it right up, but also, there was dye - enough to show it had actually formed a drip. We cleaned off the dye, and after the 20 mile trip to town and back, there was the dye around the cap threads again...
But yes - great, I'll keep in mind a good sniffer 'may' detect even on the new valve ! Back to the idea of cleaning the evaporator... Last edited by Goldenvoice; 06-28-2011 at 07:50 PM. |
#44
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Question: the new expansion valve did not come with O rings. Will 'standard' NAPA stocked O rings do the job, or should I order something specific?
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#45
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Answer
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Available at any major chain auto parts store. |
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