Everyone rebuilding their A/C system should clean out their HVAC assembly box! - Page 3 - PeachParts Mercedes-Benz Forum

daw_two · #31 05-28-2013, 03:46 PM

Quote:

Originally Posted by compu_85

I originally had the cheeky idea to just cut a hole in the HVAC box to access the "fresh" air side of the evaporator for cleaning... too bad that's the side that's against the firewall

-J

So. If the engine weren't in the way, permament installation of a firewall door with further access to the evaporator would have been a good option. Tongue in cheek.

Of course, my motivating was not to clean the evaporator, but to get rid of all of the vacuum pods and the ACC. Manual airbox all the way!!!!

SD Blue · #32 05-28-2013, 08:35 PM

Yikes! From scrolling through the wiki about Dave's removal, it might be easier to pull the engine and cut a hole for access. He definitely did the right thing by taking a lot of pictures. I've done heater and evaporator changes on cars in the past but none of them appeared as painstaking as the W123. I wonder if the W126 series is any easier.

daw_two · #33 05-28-2013, 09:46 PM

Quote:

Originally Posted by SD Blue

Yikes! From scrolling through the wiki about Dave's removal, it might be easier to pull the engine and cut a hole for access. He definitely did the right thing by taking a lot of pictures. I've done heater and evaperator changes on cars in the past but none of them appeared as painstaking as the W123. I wonder if the W126 series is any easier.

I used Dave Morrison's thread to guide me. In addition, I had removed a manual airbox from a 240D in the junkyard. Here's the pics I took in taking the manual airbox apart:
How To Disassemble A W123 Manual Airbox Photos by daw_two | Photobucket

Re-assembly is the reverse, right? Yeah, right!

Here's what the 240D donor car for the manual airbox looked like when I left it.

Whiskeydan · #34 05-29-2013, 12:32 AM

The W126 evaporator can be accessed with the blower removed. It's tight but I have done it many times. Water hose and a wet vac does wonders after brushing and vacuuming the fuzz off.

DeliveryValve · #35 05-29-2013, 12:47 AM

Quote:

Originally Posted by daw_two

....
Here's what the 240D donor car for the manual airbox looked like when I left it.

On a side note, did that car have that awful sound insulation on the firewall in which there is a outer layer of plastic, then foam glued on the sheet metal?

Mine has that crap, I ripped it all out!
Damn you Mercedes Engineers! You should of known you would build a 30 year plus service life car and that all the foam underneath the plastic shielding is rotting away and contributing to my increasing hearing loss! More pain in the arse!
$@##!! @%%&*! >$"^^!!!

.

DeliveryValve · #36 05-29-2013, 12:49 AM

Quote:

Originally Posted by Whiskeydan

The W126 evaporator can be accessed with the blower removed. It's tight but I have done it many times. Water hose and a wet vac does wonders after brushing and vacuuming the fuzz off.

That's good to know. Will have to do that on my next w126.

.

daw_two · #37 05-29-2013, 08:35 AM

Quote:

Originally Posted by DeliveryValve

That's good to know. Will have to do that on my next w126.

.

87 Champagne with an almost virgin engine and transmission would make the trip to CA.

compu_85 · #38 05-29-2013, 09:20 AM

Quote:

Originally Posted by Whiskeydan

The W126 evaporator can be accessed with the blower removed. It's tight but I have done it many times. Water hose and a wet vac does wonders after brushing and vacuuming the fuzz off.

I did do that (I made a long nozzle using a piece of copper tubing), not sure I got it all clean though

-J

vstech · #39 05-30-2013, 11:04 AM

Quote:

Originally Posted by DeliveryValve

On a side note, did that car have that awful sound insulation on the firewall in which there is a outer layer of plastic, then foam glued on the sheet metal?

Mine has that crap, I ripped it all out!
Damn you Mercedes Engineers! You should of known you would build a 30 year plus service life car and that all the foam underneath the plastic shielding is rotting away and contributing to my increasing hearing loss! More pain in the arse!
$@##!! @%%&*! >$"^^!!!

.

um... that's not foam... it's asphalt.

vstech · #40 05-30-2013, 11:08 AM

Quote:

Originally Posted by jay_bob

From someone who spends 100+ nights a year in hotels now I am totally disgusted.

Almost every Hampton Inn in the country has that stupid through the wall buzz box system.

yup... hotels swap out the wall units when they no longer cool/heat... and the "maintenance man" crew gets to "repair" or "renew" them...
I get called in when that no longer works... and I get to see the NASTYNESS that guests toss in there, and what gets past the filter...

Zulfiqar · #41 05-30-2013, 11:14 AM

yep, if its peeling off then refinish with heavy butyl sheet and ensolite foam.

daw_two · #42 05-30-2013, 11:19 AM

Quote:

Originally Posted by DeliveryValve

On a side note, did that car have that awful sound insulation on the firewall in which there is a outer layer of plastic, then foam glued on the sheet metal?

Mine has that crap, I ripped it all out!
Damn you Mercedes Engineers! You should of known you would build a 30 year plus service life car and that all the foam underneath the plastic shielding is rotting away and contributing to my increasing hearing loss! More pain in the arse!
$@##!! @%%&*! >$"^^!!!

.

I dont' think that is foam. I had one little piece tear off on the passenger side of the transmission tunnel --- I need to update my car thread with lots of pics. I need to put something over it, because it is still gooey before re-installing the carpet panels. That's probably months away...anyhow, so I'm not too concerned right now.

charmalu · #43 05-30-2013, 12:20 PM

Quote:

Originally Posted by Zulfiqar

yep, if its peeling off then refinish with heavy butyl sheet and ensolite foam.

There are a lot of sound suppressing products available for automotive use. this is the first I had heard of Ensolite Foam, so had to go search.

Ensolite IUO --- 1 yard (14 sq ft), Glue On version ( I recommend the PS version for most installs as far easier to work) - RAAMaudio Inc.

Mat and Foam Products - RAAMaudio Inc.

Ensolite is the blue pads that Back Packers use and have rolled up in their back packs. Read this on a Camping Forum in my search.

Here is another source.

Foammart

Zilfigar, the Butyl sheet, is this like the stick on tar pad that Lowes and Home Depot sell in a roll? It has been mentioned in other Threads.

Almost every car in PNP that I have removed the front carpet, Dash and AC/Heater box, the acoustical tar pad stuff MB used 30 yrs ago is old hard and crumbles with slight finger pressure. It lost is original purpose long ago.

Charlie

strelnik · #44 07-16-2014, 10:52 AM

Quote:

Originally Posted by DeliveryValve

I'm planning to use the limited space in the cowling to add in a cabin filter for the outside air intake. I am also going to put a cabin filter for the inside air intake.

So far this is for the outside air intake.

This is the cowling opened up with the windshield wiper assembly removed. Not shown, but part of the wiper motor sits on top of the HVAC intake. It would of been easier to add in a filter if this was not the case.

Another shot.

Hopefully the filters I choose will be sufficient because they are on the small side. They are for the 1999 - 2002 Chevrolet Silverado. They come in a pack of two and Measures 5 1/4" x 9 1/8". Originally suppose to be installed side by side in the Silverado HVAC box. But I will use one for the outside air side and one for the inside air side.

I chose this filter because of the space limitations in the cowling. This is where I plan to place the filter. I am going to make some ducting from fiberglass to snake around the windshield wiper motor and connecting rods.

Any thoughts?

.

EXCELLENT IDEA! Especially true since few people clean their cars yearly with ammonia to kill germs, or de-ionize them.