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Rear Blower Resistor pack location

36K views 27 replies 14 participants last post by  BillGrissom 
#1 ·
Hi. I have a 01 GC. I've successfully changed the front blower resistor pack but need to do the rear blower as it only runs on high. Does anyone know where the resistor pack is located?
 
#2 ·
Have to remove the plastic panel, where the blower is, back right hand side. You can hear the blower, when working.
 
#5 ·
I think it is basically the same deal, you will know when you get the part.
 
#4 ·
BLOWER MOTOR RESISTOR
DESCRIPTION
A blower motor resistor is used on this model when
it is equipped with the manual heater-A/C control
. Models equipped with the optional Automatic
Temperature Control (ATC) use a blower power
module, instead of the blower motor resistor. The
blower motor resistor is installed in a mounting hole
on the back of the rear heater-A/C unit housing,
directly above the expansion valve. The resistor consists
of a molded plastic mounting plate with an integral
connector receptacle. Concealed behind the
mounting plate within the rear heater-A/C unit housing
are two coiled resistor wires contained within a
protective stamped steel cage. The resistor mounting
plate is secured with two screws to the rear heater-
A/C unit housing and is accessed for service by
removing the right quarter and D-pillar trim panels.
The blower motor resistor wires will get hot when
in use. Do not touch the resistor wires or the protective
cage if the blower motor has been running. The
blower motor resistor cannot be adjusted or repaired
and, if faulty or damaged, it must be replaced.
OPERATION
The blower motor resistor is connected to the vehicle
electrical system through a dedicated take out
and connector of the rear HVAC wire harness. The
blower motor resistor has two resistor wires, each of
which will reduce the current flow through the
blower motor to change the blower motor speed. The
blower motor switch in the manual heater-A/C control
directs the ground path for the blower motor
through the correct resistor wire to obtain the
selected speed. With the blower motor switch in the
lowest speed position, the ground path for the motor
is applied through both resistor wires. Each higher
speed selected with the blower motor switch applies
the blower motor ground path through fewer of the
resistor wires, increasing the blower motor speed.
When the blower motor switch is in the highest
speed position, the blower motor resistor wires are
bypassed and the blower motor receives a direct path
to ground through the blower motor switch. The
blower motor resistor may be diagnosed using conventional
diagnostic tools and methods.
 
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#13 ·
Here's n9mxq's write up from his link....
TREVOR


You'll need 2 tools...
A prybar and an 8mm socket

Remove the Trim at the top of the rear opening:

And the bottom:

Gently pull the trim cover with the vent to expose the Christmas tree fasteners (3)
Carefully pry them out with the prybar

As you can see, one of mine popped out of the trim..it reinstalled easily

You can now access the blower resistor and remove it's mounting screws with the 8mm socket

Slide the red safety lock to the left and depress the tab to remove the resistor assembly from the harness (mine was quite stuck)

Replace the resistor and reassemble your trim.
Be careful to reshingle the tabs if you pull your trim out too far!

Congrats..you just replaced your rear blower resistor...
 
#15 ·
The purpose of giving the writeup it's own page was so the photos would display correctly. If you view the page the photos will display in a more friendly manner.

Glad people are finding this helpful
 
#16 ·
OK I could have reduced the images size a little bit, but I still think they work. I guess I have a widescreen monitor so it isn't a problem, or if you have a better resolution monitor. If you have a 1024x768 monitor I would suggest going to the link above.

Good luck.

Thanks for the write-up again.
 
#19 ·
Not to drag up and old thread, but I noticed that the rear blower in my 03 only seems to work on the left & right most settings on the main panel on the dash. Same thing seems to happen when you turn the fan nob on the roof mounted module between the middle seats. I'm assuming it's the resistor module, and the link in this thread was very helpful in how to replace it.

While looking up parts, I see several listed. I've got dual zone in the front, and the rear panel. Can I just use the $15 part that any parts store carries? Or do I need to order the $70 - $90 part I see listed some places. Is this setup considered 'manual' or '
'automatic'?
 
#20 ·
You can use the cheaper resistor block if you have manual temp controls. If it' s got automatic temp control you'll need the more expensive control module. Check your manual.
 
#28 ·
In my 2002, it is the same place described. Popping the plastic panels off is actually fairly simple, like playing with Legos. Remove the rear and maybe middle seats. Pop the bottom and top ones first, which is obvious because they overlap the passenger side one. Unbolt the rear vent actuator. Now, I recall you can pop off the passenger side panel. I don't recall any screws, but look. Look for the cable going into a part bolted into the ductwork. That is the "resistor pack". If you have the digital display (ATC), yours is actually electronic (transistors) instead of simple resistors. It also costs much more. While in there, a good time to replace the AC expansion valve if doing something like a compressor replacement and flush. If you also pop off the fwd panel, you will see the heater hoses, which might need replacing by now. I replaced w/ silicone hose to last forever. Don't fear the crimped ferrules, as they are thin aluminum you can cut or snip off. Screw clamps work or Oeticker ear clamps (e-bay).

Re what do things look like and what are they called? Google Images and ebay are great, and sometimes youtube videos on the exact task.
 
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