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A 355nation HOW TO presented by Canyon08Z71 & Ssgjurista
with additional information contributed by philmiami and jlong
Project Name How To: HVAC Fan Motor Resistor & Connector Replacement, Fan Motor Ground Reconditioning & Repair
Project Description HVAC Fan Motor: Resistor & Connector replacement.
Skill Level Moderate
Project Vehicle Make: GMC
Model: Canyon
Year: 2004
Engine: 3.5L
Power windows: Yes
Sun Roof: No
Tools
Wire cutter/stripper/crimper
10mm 1/4" drive socket
Sandpaper or flat file or dremel tool with a sanding disc
Optional: 7mm socket, 1/4" drive extension, and 1/4" drive ratchet OR 7mm wrench
Soldering iron and solder
Pliers or vice grips
M6 X 1.50 tap
Stainless steel M6 X 25mm bolt
Parts needed
Touchup paint or RTV silicone
Shakeproof ('Star') washers to fit M6 bolt
Optional: Crimp type or solder type ring terminals for 10-12 guage wire
GM Parts List:
Note:
The resistor needs to be purchased to complete the repair. You can either decide to splice in a replacement connector or replace the entire wiring harness.
Another option is to buy the resistor, connector and harness as a package. See photos below.
Please refer to the first schematic at the end of this 'How To'.
There is battery voltage at all times to the 'IGN 3 HVAC Relay 59' in the fuseblock. With the ignition switch in the 'ACC' or 'ON' positions, the Body Control Module (BCM) provides a ground on the Orange wire. The relay energizes and voltage flows through the Blower Fuse 41 (30A) and leaves the fuseblock on the Brown wire and travels to the Blower Motor. It passes through the Blower Motor and follows the Orange wire until it reaches the splice S202. With the fan speed set to #4 (High), the voltage goes to the HVAC Module (HVAC controls below the radio) on the Orange wire, through the Blower Motor Switch on the High circuit and then exits the HVAC Module on the Black wire and ends up at Location 'F' on the Splice Pack (SP 106). The Blower Motor runs at High speed.
Let's go back to Splice S202 again and this time the fan speed is set to #3 (M2). Voltage now travels the opposite Orange wire to the Blower Motor Resistor Assembly.
After passing through a resistor, a reduced voltage follows the Light Blue wire to the HVAC Module, goes through the Switch on the M2 circuit, and exits on the Black wire to SP 106. The Blower Motor runs at a lower speed.
For fan speeds #2 (M1) and #1 (Low) the voltage still goes to the Resistor Assembly but passes through resistors in series and exits on the Tan and Yellow wires, respectively, before going to the HVAC Module and Blower Motor Switch and then to SP 106.
Please refer to the Ground Distribution Part 5 & 6 Schematics.
Splice Pack 106 consists of a small black plastic box where several ground wires meet. Inside the box, the wires are attached to a metal ground strap. The strap is bolted to a sheet metal ground and is known as Ground 106 (G106). On the previous schematic, the Black ground wire from the HVAC Module entered SP 106 at Location 'F'. On these schematics it shows two Locations: 'F' and 'G'. 'F' is for the Blower Motor and 'G' is for the Logic circuit within the module. SP 106 and G106 are located on the inside of the right front fender behind the air cleaner. The first pic shows the lid removed from the air cleaner. The next two pics show the air cleaner removed for clarity.
HVAC Fan Motor Legend:
--------------------------
1 - Resistor
2 - Blower Motor Cooling Tube
3 - Blower Motor
4 - Blower Motor Electrical Connector
5 - HVAC system
Legend:
--------
1 - Blower motor resistor electrical connector
2 - Blower motor resistor
3 - Blower motor
1) Evaporator Temperature Sensor (C60)
(2) C203 (I/P Harness to the HVAC Harness)
(3) Recirculation Actuator (C60)
(4) Blower Motor
(5) S202
(6) Blower Motor Resistor Assembly
Location: Passenger side part of the dash (underneath glove box).
Canyon08Z71's Repair
Symptoms: When starting my truck for the first time on cold Winter days, the fan motor didn't work on setting #1, #2, or #3. Only setting #4 (High) worked to turn on the fan. Once the truck warmed up, the HVAC fan motor settings #1 through #4 worked fine.
Problem found: Burnt up terminals for the resistor and connector. Plastic housing for resistor and connector melted.
philmiami's Repair
My fan control quit working on setting number 3. The problem began after I had a dealership replace the blower motor because of the whining noise it made when it was still under the 3 year/36K mile warranty. Sometimes I would have to reach under the dash and push up the connector because the fan would quit working, most of the time while driving. It was very annoying. I went and looked and the blue wire was changing to a burnt looking color. I knew it was the resistor going bad and it really melted the connector. I went to rockauto.com to find the parts; their catalog is superb for finding parts for most vehicles.
I ordered the parts; a new connector (which cost 3 times the price of the resistor) and resistor and had them shipped 2 day Fedex. The connector comes with gray wires so don't mix up the colors when you cut and splice to the original harness. It comes with 4 butt connectors so this was a easy fix.
jlong's Repair (using replacement harness):
Note:
jlong dropped the glovebox and access panel from the side of the dash to make it easier to install the new harness. To take the glovebox out, do the following.
Support the glovebox with one hand and remove the three screws along the bottom edge of the glovebox. Open the glovebox to the full open position while continuing to support it. Now squeeze the sides of the glovebox toward each other so they clear the dash and pull the glovebox free. Reach up inside the dash and push the side panel out.
When finished with repairs, reverse the steps above to reinstall.
Ground Reconditioning & Repair
The Splice Pack (SP 106) and the Ground (G106) are suspected to be the primary cause for the resistor, connector, and harness overheating, arcing, and getting burned.
This what 'hrkart66' posted on CFans in December 2008: Quote: Hello every one. Im new here but I do have some tips. I am the fleet manager for a Miller dist.
1. If you havent already, replace the connector to the blower motor resistor.
2. If the blower has stopped working all together.
A. Pull the connector out of the blower motor and check the orange wire for continuity to ground with the a/c control set to any fan speed.
B. If there is no ground present go under the hood and looking over the passenger fender between the air box and the inner fender you will see a small
black box with at least 4 wires coming out of it and it will be bolted to the fender with a 10mm bolt. This a ground distribution point and it SUCKS. It
will be about an 1.5 inchs by .5 in thick. I have found the first time that scuffing the area around where the bolt goes to bare metal will work but now
I just cut them all as close to the dist. block as possible and use 2 ring terminals big enough for 2 wires and bolt it back on.
Also they dont tell you this but the burnt resistor connector is caused by the intermittant grounding issue and we also have found that the trucks that we did this to before doing the brake switch recall havent had that problem. If you notice that with the wires cut from the dist. block or if you take the top part of it off and break the connections and turn on the key you will get all sorts of messages from the inst. cluster like brake and abs fault. End quote
Method 1
Can be done without removing the air cleaner.
1. Remove the bolt holding the splice pack and ground from the inside of the fender. The bolt will stay with the strap.
2. Using sandpaper, or a flat file, or a dremel tool, remove the coating on both sides of the ground strap until you can see brass showing.
3. Remove the paint around the hole where the strap rests against the fender.
4. Place a 'star' washer on the bolt and slide it against the strap.
5. Reinstall the bolt, splice pack, and ground to the fender and tighten.
6. Apply several light coats of touch up paint or a bead of RTV to seal the connection.
Method 2
This is the method I used and requires removing the air cleaner.
1. Remove the bolt holding the splice pack and ground from the inside of the fender. The bolt will stay with the strap.
2. Work the bolt out of the strap; this requires a bit of patience, and discard the bolt.
3. Using sandpaper, or a flat file, or a dremel tool, remove the coating on both sides of the ground strap until you can see brass showing.
4. Remove the paint around the hole where the strap rests against the fender.
5. Run an M6 X 1.50 tap through the threads of the hole in the fender.
6. Place a star washer on a stainless steel M6 X 25mm bolt.
7. Put the bolt through the strap and place another star washer on the bolt.
8. Reinstall the bolt, splice pack, and ground to the fender and tighten.
9. Apply several light coats of touch up paint or a bead of RTV to seal the connection.
Method 3
1. Remove the bolt holding the splice pack and ground from the inside of the fender. The bolt will stay with the strap.
2. Work the bolt out of the strap; this requires a bit of patience, and save the bolt.
3. Using sandpaper, or a flat file, or a dremel tool, remove the coating on both sides of the ground strap until you can see brass showing.
4. Carefully break open the plastic box on the splice pack.
5. Cut off the wires where they connect inside and discard the plastic box and strap.
6. Strip off about 1/2"-3/4" of the insulation from each wire.
7. Divide the wires into two groups.
8. Place one group of wires into a ring terminal and crimp the terminal onto the wires.
9. Repeat Step 8 for the second group of wires.
10. Place a 'star' washer on the bolt and put it through the ring terminals.
11. Place another star washer on the bolt.
12. Install the bolt, washers, and terminals to the fender and tighten.
13. Apply several light coats of touch up paint or a bead of RTV to seal the connection.
If you desire, instead of using the crimp type terminals, you can use the non insulated type and solder them to the wires.
Re: How-To: HVAC Fan Motor Resistor & Connector Replacement
yeah Im havin trouble with mine it will work only when set to speed 4 or I can hit the damn fan motor with a blunt object :hulk: , then 1,2 and 4will work but speed 3 never works piece of :lance2: , you guys think its the same problem or its somethin else? hate to start rippin wires out and its somthing completly different.
yeah Im havin trouble with mine it will work only when set to speed 4 or I can hit the damn fan motor with a blunt object :hulk: , then 1,2 and 4will work but speed 3 never works piece of :lance2: , you guys think its the same problem or its somethin else? hate to start rippin wires out and its somthing completly different.
Re: How-To: HVAC Fan Motor Resistor & Connector Replacement
Ok guys I just did this over the weekend and its easy to do.
*Note I bought my parts from the stealership; the prices were about the same once you figure in the shipping. Also, my dealer had them on hand, so no waiting.
I talked with the part department and they said that GM re-engineered the resistor and harness. If you buy them from the dealer there is a damn good chance you not have to redo this. NOW if you buy them from any place other then the dealer there is a chance you might be buy the non reengineered resistor/harness.
I still find it rather funny its cheaper to buy a whole harness then just the connector. Well for the ease and time of the install, I got the whole harness. It took me a total of 15 minutes to complete the job. Timing was right on the money too, the northeast is having the coldest temps so far this season.
Ok guys I just did this over the weekend and its easy to do.
*Note I bought my parts from the stealership; the prices were about the same once you figure in the shipping. Also, my dealer had them on hand, so no waiting.
I talked with the part department and they said that GM re-engineered the resistor and harness. If you buy them from the dealer there is a damn good chance you not have to redo this. NOW if you buy them from any place other then the dealer there is a chance you might be buy the non reengineered resistor/harness.
I still find it rather funny its cheaper to buy a whole harness then just the connector. Well for the ease and time of the install, I got the whole harness. It took me a total of 15 minutes to complete the job. Timing was right on the money too, the northeast is having the coldest temps so far this season.
I had to do this repair on my 2004 Canyon.. The 2008 is good so far, no problems. Hopefully your dealership is correct in stating that GM redesigned the parts.
Trust me, its not hard at all. Just pop out the golve box to have access to everything and its plug and play from there. If you good. it should take you 15 mins max.
Re: How-To: HVAC Fan Motor Resistor & Connector Replacement
Looks easy enough. Now I just gotta get the money to buy the parts, if that's what's wrong. Of course it happens after I dump almost $500 on my truck...
Re: How-To: HVAC Fan Motor Resistor & Connector Replacement
For the people that have had to do this so far.... How much of a pain in the ass is this to do? Is it worth doing it myself as appose to taking it to a shop?
For the people that have had to do this so far.... How much of a pain in the ass is this to do? Is it worth doing it myself as appose to taking it to a shop?
Very easy, 1hr or less (depending on proficiency)...
What are you replacing (resistor & harness? resistor & connector?)
Take the resistor connection apart and see what damage you are dealing with. That will let you know what parts you need to order for the repair... Take pictures and we can help you out identify what is bad (if needed). :high5:
I would recommend doing this yourself and saving the 1-2 hr labor charge the shop will hit ya with.......:thumbup:
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