Member Since: 06 May 2012
Location: Arizona
Posts: 48
Stepper Blender Motors: RHD vs LHD placement
I’m deep in it - I have multiple stepper - blender error codes and heating / ventilation system is barely working on my 2005 Disco3 / LR3.
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Based a good writeup I found here, I took the advice to replace all stepper / blender motors rather than the just specific problem ones. The theory is that after going through all the effort to access the parts (on a 14-yr-old vehicle), you might as well replace all the items.
My problem is that while the stepper blender motors have discrete Land Rover part numbers, 3 of them look exactly the same, and the original parts all have the same manufacturers part ID, so I can’t look at the ID on the old part and match with the new replacement. I imagine the same Denso motor is calibrated for different range of motion depending on the location. The only diagram I could find is for RHD (see photo at bottom).
Because the LR041272 motor has a different arm, I can match this with the one being replaced, and although the blower is on the opposite side, this stepper is on the same side.
My question is whether anybody can confirm that the stepper motors are oriented the same for RHD and LHD, even though the heater/AC unit has significant redesign for RHD/LHD. Here's the mapping I have parts and placement on RHD, and I'd like to add a mapping for LHD - just to avoid the scenario where I get it buttoned back up and find out that I should have mirrored placement of something.
LR041271-stepper-motor -> RHD location: RHS upper -> LHD location: ?
LR041272-stepper-motor -> RHD location: LHS upper -> LHD location: LHS upper
LR041273-stepper-motor -> RHD location: LHS lower -> LHD location: ?
LR041274-stepper-motor -> RHD location: RHS lower-> LHD location: ?
And a related question: I plan to replace the stepper motor for the recirc door (pn JNC500040). Has anybody succeeded in replacing this without taking the top dashboard off? I can access the bottom 2 screws but the top 2 would be totally by feel with very cramped access.
Here's the RHD diagram (from Advanced Factors site where I bought most of the parts):
27th Mar 2019 5:12 am
PedalToTheMetal
Member Since: 21 Jun 2018
Location: Novi
Posts: 5
Were you able to figure out the part numbers and would you mind sharing?
Our air blend motor on the passenger side died and the dealer sold me a LR041273, which turned out to rotate the wrong way. I guess this confirms that it is actually supposed to go on the driver's side.
At least this part of your list therefore also appears to be correct for the LHD variants:
LR041273-stepper-motor -> RHD location: LHS lower -> LHD location: ?
LR041274-stepper-motor -> RHD location: RHS lower-> LHD location: ?
Also, how did you manage to remove the lower side panels of the center dash?
Oliver
24th Nov 2019 4:44 am
J.Prezes
Member Since: 10 May 2015
Location: usually at my Indy's shop
Posts: 62
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