View Full Version : Rear Heater Switch Options

02-09-2013, 11:43 PM
I've spent considerable time this evening trying to search switch options. The only factory switch that I've been able to find is the is the single position unit. MB Part No : 005-545-01-07 I've sourced a rear heater unit from a VW that is a three speed unit. It's very compact. I don't necessarily need three speeds but two would be nice. I'd prefer the look of an OE switch but would most definitely consider alternatives that fit into the factory slots.


02-09-2013, 11:59 PM
Try this link:http://sprinter-source.com/forum/showthread.php?t=6206&highlight=switches

Pick one that you like.


02-10-2013, 12:32 PM
Some interesting options there. It seems the rear blower factory switch is only a single throw. Does that not seem strange? I realize that I could use any other double switch but call me vain I'd like it to look factory correct. It would also be nice to see the switch illuminated at night.

02-10-2013, 02:43 PM
The factory rear fan switch is illuminated. It's a two position rocker switch - for speed 1 and 2. The location isn't that ideal and is slightly hidden by the steering wheel.


02-10-2013, 03:09 PM
the rear blower factory switch
Switch 107 in the above drawing is the rear heater fan switch

Here it is from the Owner's Manual:
as bc339 says, it gives two speeds... and the center is "off"
(so it's really a 3 position switch)
The service manual's schematics for the 2003-2006 do not show that switch's wiring, so i can't off-hand comment if it's SPDT or DPDT.
(since it may also be tasked with running an extra circulation pump)

A couple of years ago there was a thread about a resistor module that's in the rear cabin heater core's area.. finding that thread may find more info on the switch

Here are photos of the switch. The first shows where it is on the dash, the other three show the three latched positions (top pressed, center off, bottom pressed).
Excuse the dust, but at least it shows the relative switch positions.



02-10-2013, 03:50 PM
Thanks for the words guys. Maybe I'm splitting hairs but isn't switch 87 for the optional rear ceiling ventilation fan? Looking in my owners manual shows the switch in position number three - just right of the steering wheel. The manual is calling the switch Auxiliary heat exchanger and it appears to be a dual speed unit but they dont' offer a part number. From past experience it pays to be armed with PNs going into the dealership.

In the time I was writing my response you edited and added the pic. YES, that's the switch I'm looking for.

02-10-2013, 03:58 PM
Does the little number in the bottom of the photo in the manual mean anything?

N54-25-2076-20 is in the photo of the aux. heater blower switch.

02-10-2013, 04:45 PM
I think the part you wish is may be "Switch, Rear Blower" ... Dodge part number 05103853AA
(added: MB part number A0055451007 )

I pulled that from this 5-page extract of the parts catalog: 50294
(it's item "4")

...that said, i do not trust my reading of the parts catalog, since i don't like (a) the fuzzy drawings (doesn't look two-way), nor (b) the position they place the switch.

There's another much older thread that has much more switch data detail. Time to hit the search function (while i dig into my on-disk saved pages)

Watch this space for further updates....
p.s. i'm pretty sure the "N54-25-2076-20" is just a drawing designator, but i'll try looking for it as part-number related
added: searching the parts list for "54252" does not find any hits that include that sub-string

02-10-2013, 05:24 PM
Our Sprinter is equipped with the rear heat option and is on the left side of the floor. The correct name is Additional Heat Exchanger, Rear.
I pulled the part numbers from MB EPC for my vehicles build. EPC will list the p/n's based on VIN's, so these are the p/n's used with mine.

The p/n for the switch is Dodge p/n 05120436AA, MB p/n is A 005 545 02 07.

You will also need the connector and terminals.

Connector, Dodge p/n 05120633AA, MB p/n A 013 545 40 26

Terminals, Dodge p/n 05103882AA, MB p/n A 011 545 81 26

N54-25-2076-20 is the illustration number used in the manual. It's a reference number used by the manual writers.


02-10-2013, 06:37 PM
Dick and Bruce, Thanks so much for the help. Very much appreciated. I'll be paying the dealership a visit tomorrow. Hopefully they can get these items overnighted. I'm headed on a trip this week with our van and it would be nice to have a functional rear heater.

02-10-2013, 06:57 PM
For other switches, chase down the links that are presented in this thread: http://sprinter-source.com/forum/showthread.php?p=48886

Unfortunately, "Dodge p/n 05120436AA, MB p/n is A 005 545 02 07" isn't covered there.

Since the little triangles probably light up appropriately to the switch position, the internal wiring of the switch may match this one (the rear air conditioner fan switch):
(page 8w-42-12 in the 2006 service manual, available here: http://aie-services-2.net/Sprinter/ )


...The triangle LEDs depend upon the switch wiper (moving part) encountering +12v
So if you wired that switch in "typical" fashion (wiper fed by 12v, gives it to the connected-to-motor contacts), the triangles would always be On.
Instead, they connect the contacts to the 12v feed (contacts 3 and 8 are wired to "splice S256", which is fed by "fuse 9"), and then the lights come on when the switch it flipped to touch that "hot" contact.

But the in-floor fan switch's guts may be completely different ...


02-11-2013, 04:44 PM
Thanks Dick.

I ordered all the necessary bits this morning. Switch, connector block and connectors. Going to do the Espar switch at the same time. May as well as I'll have everything apart anyhow.