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Started by Big_Richard, 12 December 2009, 04:21 AM

Big_Richard

i was tempted to construct my own hotwire cutter, but really couldnt be bothered putting one together - I didnt fancy sacrificing my all important toaster either ;)

The airbox refoaming is now 100% complete, including the intricate little front wintow defrost flaps - there will be 99.9% of airflow cut off to those vents now when the lever is closed ;)


Big_Richard

The next time i work on this airbox, it will be going back together ready for reinstallation ;)


WGB

I would hate to be the warm beer at the barbie but is it not possible to remove most of this gear without removing the dash board.

I went back to my HVAC printed manual and removal of the heater box makes no mention of dashboard removal and specifically shows how to achieve it with the dash in position.

I then realised that the procedure is probably here in the workshop manual and it is - if anything the pictures are a little better than in my reprinted manual - Heater Box Removal

It is probably more awkward and I am not sure that all the upper flaps come with the heater box but I would prefer to do it this way than risk damaging the dash corners on my pristine dash.

Bill

TJ 450

That makes sense, Bill, as it should just slide back and out from under the dash. Trying to remove the A/C fittings would be a pain though.

MT removed his dash specifically for restoration and the heater box was an afterthought, but I'm sure it would make removal easier. It's a pity about the damage.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

Big_Richard

no doubt the airbox could be removed with the dash installed, but i'm pretty sure the difficulty factor would multiply by say, a million.

I'm affraid my swear word vocabulary wouldnt be extensive enough to even consider such a task ;)


koan

Quote from: WGB on 24 December 2009, 09:06 PM
I would hate to be the warm beer at the barbie but is it not possible to remove most of this gear without removing the dash board.

I went back to my HVAC printed manual and removal of the heater box makes no mention of dashboard removal and specifically shows how to achieve it with the dash in position.

I understand "Heater Box" to mean just that, heater without A/C, I think the 83-100 jobs refer to heater only, 83-500 jobs are two knob HVAC, 83-600 and 700 are climate control.

koan
Boogity, Boogity, Boogity, Amen!

WGB

Quote from: koan on 25 December 2009, 01:32 AM
Quote from: WGB on 24 December 2009, 09:06 PM
I would hate to be the warm beer at the barbie but is it not possible to remove most of this gear without removing the dash board.

I went back to my HVAC printed manual and removal of the heater box makes no mention of dashboard removal and specifically shows how to achieve it with the dash in position.

I understand "Heater Box" to mean just that, heater without A/C, I think the 83-100 jobs refer to heater only, 83-500 jobs are two knob HVAC, 83-600 and 700 are climate control.

koan

I have the printed US manual of the same PDF's and it is divided into "section 1 -  HVAC" and "section 2 - Automatic Air conditiooning".

Jobs 83-100 and 83-500 are all part of the HVAC section and refer to the A/C evaporator and it's housing being joined to the top of the heater box.

I am not talking with any knowledge but

1) They make no mention of any US model with a heater only - only HVAC system up to and including 1975
2) Is it possible that the heater box can be removed leaving the A-C evaporator and housing in situ.

Those that have done it may have some knowledge.

Bill

TJ 450

Quote from: WGB on 25 December 2009, 03:23 AM
2) Is it possible that the heater box can be removed leaving the A-C evaporator and housing in situ...

I can't imagine that is possible, due to the integrated design of the unit.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

WGB

No worries - thanks.

Just exploring the art of the possible.

Bill

TJ 450

No worries Bill, I should have made that sound a little less serious. 8)

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

Big_Richard

its all he says she says bullsh%t untill someone actually does it and can tell us all what's involved ;)

period.

TJ 450

Well, I can say for certain that to separate the box, clips need to be removed from the firewall side.

However, I'm with your statement MT for the rest of it. 8)

There is also the issue of the heater pipes that are rather long and require the box to be moved directly rearwards. I can't see that happening, but I'm happy to be proven wrong. ;)

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

koan

Not sure about this WGB.

I too have the printed copy of "Service Manual Heating, Air conditioning Automatic Climate Control Mode116".

Job 100 mentions disconnecting heater hoses, draining some coolant and removing heater box, no mention of A/C plumbing or HVAC box

job 538 "Removal of and installation of Evaporator.

I've read these jobs as referring to two different units, not part and full removal of the two knob unit.

Quote
I am not talking with any knowledge but
Me neither!

Didn't we have a post in the last 6 months from someone with a pov spec 116 that had heater but no A/C?

When I took the HVAC box out of my partner's car (not MB) I read the Haynes manual and thought this is going to be easy, no need to remove dash to get heater box out but then realised heater box was exactly that, not HVAC that requires dash removal.

koan
Boogity, Boogity, Boogity, Amen!

another sad 280s

i have personally removed the box with the dash in situ. only took a couple of weeks. it is a very tight fit requiring some of the dash bolts to be removed anyway and rather of a few hours spent in positions known only to acrobats. look for another quasi reason to pull out the dash and then do the heater box while you're at it.
on another point even if you could remove just the heater component acces would be pretty useless in terms of refoaming and certainly attaining pb's level, impossible.
having said all this it's a job well worth doing, albeit only once.

koan

Boogity, Boogity, Boogity, Amen!