HVAC Blower quit working.

H3 Specific Information

HVAC Blower quit working.

Postby 08H3 » Sat Jan 02, 2010 9:14 pm

Need some quick help. Today the heater blower stopped working. The first time it happened there was about a two second delay between the time I started the truck and the fan kicked on. Knew it wasn't right but thought nothing of it. Everything seemed fine. Couple hours later went back and there was no fan at all until about 10 minutes into the trip. At that point it came on, worked fine for 10 minutes or so. To "test" it I turned it off and it has not come back on since. Checked all the fuses that I thought pertained to the fan. All checked out fine. Pulled the blower resistor and although I admittedly have no idea what to check, it visually looks fine. Netiher the resistor or plug show any heat damage.

Any ideas? I was to leave on a vacation early Thursday, but I can't drive in this weather with no heat and I'm not sure the dealer can get me in before then.

Thanks in advance.
User avatar
08H3
Trail Rider
Trail Rider
 
Posts: 216
Joined: Wed Feb 25, 2009 6:49 pm

Re: HVAC Blower quit working.

Postby Flash » Sat Jan 02, 2010 10:41 pm

1. That sucks.
2. One of the best things I like about my Hummer is the heater. By far - the best ever!!! Unbelievable how fast it heats up the cab. 6 minutes into a run and I have to turn down the heat.
3. My Reatta ( at 18 years old) needed an occasional squirt of either WD40 or Electrical contact cleaner to keep dash lights working (via contacts on the push buttton switches).
4. If you pulled contacts, try a squirt of WD40 or (CRC) electrical contact cleaner. I am just guessing - but based on my experience with the Reatta, I would try it.
'06 H3 - OEM UCP, OEM rocker rails, Hunner skids, customized antenna, Line-X'd custom fabbed roofrack, DuraTrac 285's, Fox reserve resevoir shocks, GM performance air intake and a little bit of chrome...
User avatar
Flash
Trail Rider
Trail Rider
 
Posts: 146
Joined: Mon Jul 14, 2008 3:44 pm
Vehicle: '06 H3

Re: HVAC Blower quit working.

Postby Seth » Sat Jan 02, 2010 10:51 pm

08H3 wrote:Any ideas? I was to leave on a vacation early Thursday, but I can't drive in this weather with no heat and I'm not sure the dealer can get me in before then.

I have no idea about how to solve your problem, but that would be pretty sad if your dealer couldn't fix you up by Tuesday. I usually get same day service without an appointment. Only thing that usually holds up the completion date is if they have to order a part.
Keep your wits sharp, your heart open, and your gun loaded.
User avatar
Seth
Chapter President - SoCal
Chapter President - SoCal
 
Posts: 9621
Joined: Wed Jun 13, 2007 3:51 pm
Location: San Diego
Vehicle: JK Rubicon Unlimited

Re: HVAC Blower quit working.

Postby 08H3 » Sun Jan 03, 2010 10:14 am

Seth wrote:I have no idea about how to solve your problem, but that would be pretty sad if your dealer couldn't fix you up by Tuesday. I usually get same day service without an appointment. Only thing that usually holds up the completion date is if they have to order a part.


Only basing that on my own doom and gloom attitude and the possibility of having to order parts. Don't hold anything against the dealer...yet.
User avatar
08H3
Trail Rider
Trail Rider
 
Posts: 216
Joined: Wed Feb 25, 2009 6:49 pm

Re: HVAC Blower quit working.

Postby f5fstop » Sun Jan 03, 2010 10:31 am

Is it not working on ALL speeds? (In the HI position, the blower motor ground circuit bypasses the blower motor resistor pack. So, if it works on HI, most likely it is the resistor pack.)

Did you check all of the fuses?
HVAC BLWR 30A Fuse 82
HVAC CNTRL HD 10A Fuse 59
RDO Fuse 10A Fuse 13 (If this one is blown the radio will not work either.)

Another suggestion, switch out the HVAC Relay (number 87) with another identical relay in the fuse panel (I believe the A/C Clutch Relay (number 76) is the same type of relay. The HVAC relay supplies the main power to the blower motor through fuse 82. To switch out a relay, just pull it straight out. MAKE SURE when swapping out relays to compare the relay part number, which is in plain sight on the top of the relay. IN ADDITION, MAKE sure you note how they go into the slots. Usually, not possible to insert incorrectly, but we all know Murphy’s Law.

You can always, disconnect the blower motor’s two pin connectors and run some jumper wires; 1 from the battery (BROWN WIRE, Terminal 2), one from ground control circuit (ORANGE, Terminal 1). This will simulate the BLOWER motor on the HI speed circuit (no resistors in the control circuit). If the blower motor now works, it is a wiring problem in either the blower motor power or ground control circuit, or a defective blower motor control module.
Thank you, USVibrant.
User avatar
f5fstop
Trail Expert
Trail Expert
 
Posts: 1776
Joined: Fri Oct 06, 2006 6:36 pm
Location: Moab, UT
Vehicle: 2008 H3 / 2013 Silverado

Re: HVAC Blower quit working.

Postby 08H3 » Sun Jan 03, 2010 11:54 am

f5fstop wrote:Is it not working on ALL speeds? (In the HI position, the blower motor ground circuit bypasses the blower motor resistor pack. So, if it works on HI, most likely it is the resistor pack.)

Did you check all of the fuses?
HVAC BLWR 30A Fuse 82
HVAC CNTRL HD 10A Fuse 59
RDO Fuse 10A Fuse 13 (If this one is blown the radio will not work either.)

Another suggestion, switch out the HVAC Relay (number 87) with another identical relay in the fuse panel (I believe the A/C Clutch Relay (number 76) is the same type of relay. The HVAC relay supplies the main power to the blower motor through fuse 82. To switch out a relay, just pull it straight out. MAKE SURE when swapping out relays to compare the relay part number, which is in plain sight on the top of the relay. IN ADDITION, MAKE sure you note how they go into the slots. Usually, not possible to insert incorrectly, but we all know Murphy’s Law.

You can always, disconnect the blower motor’s two pin connectors and run some jumper wires; 1 from the battery (BROWN WIRE, Terminal 2), one from ground control circuit (ORANGE, Terminal 1). This will simulate the BLOWER motor on the HI speed circuit (no resistors in the control circuit). If the blower motor now works, it is a wiring problem in either the blower motor power or ground control circuit, or a defective blower motor control module.


Thanks for the help. I did swap relays, but that did not solve the problem. I did check both 82 and 59 but not 13. Radio does work though, so I guess that can be ruled out. If it warms up, I may try jumping directly to the motor, but as cold as it is I may likely end up calling the dealer first thing tomorrow and hoping for the best.
User avatar
08H3
Trail Rider
Trail Rider
 
Posts: 216
Joined: Wed Feb 25, 2009 6:49 pm

Re: HVAC Blower quit working.

Postby Ryan Graham » Sun Jan 03, 2010 1:32 pm

It's probably the blower resistor. I've done a couple on Colorado's and on the other chev trucks. Sometimes the connector to the resistor is melted so you will have to replace the resistor and pigtail (your dealer will have them in stock). I agree with F5 in that the "HIGH" setting should bypass the resistor, but I have done more than one that the blower was entirely inop due to the resistor. Let us know
Ryan Graham
Trail Novice
Trail Novice
 
Posts: 44
Joined: Sun Apr 06, 2008 2:26 pm
Vehicle: 06 Hummer H3

Re: HVAC Blower quit working.

Postby f5fstop » Sun Jan 03, 2010 3:30 pm

Then to prove out the resistor is just supply a ground from the blower motor to a good ground point. If the blower now works it is the resistor. Easy to do...but if under warranty, let the dealer screw with it.
Thank you, USVibrant.
User avatar
f5fstop
Trail Expert
Trail Expert
 
Posts: 1776
Joined: Fri Oct 06, 2006 6:36 pm
Location: Moab, UT
Vehicle: 2008 H3 / 2013 Silverado

Re: HVAC Blower quit working.

Postby 08H3 » Sun Jan 03, 2010 5:43 pm

f5fstop wrote:...but if under warranty, let the dealer screw with it.


And that's what I decided. I'll post the findings.
User avatar
08H3
Trail Rider
Trail Rider
 
Posts: 216
Joined: Wed Feb 25, 2009 6:49 pm

Re: HVAC Blower quit working.

Postby Lyn-X » Sun Jan 03, 2010 7:03 pm

Mine did the same thing awhile back: viewtopic.php?f=25&t=11011
'06 H3 Adventure-Brush Guard-PCM-Roof Rack-285 Falken Wild Peak A/T-minimal bling.
User avatar
Lyn-X
Trail Rider
Trail Rider
 
Posts: 127
Joined: Fri Jul 17, 2009 1:11 pm
Location: Western, N.C.
Vehicle: H3 Adventure

Re: HVAC Blower quit working.

Postby 08H3 » Mon Jan 04, 2010 6:17 pm

Just for anyone curious, it was the resistor. Looked fine to me, but apparently it was bad. Back to being nice and toasty now, but the 70 mile drive to the dealer with no heat and 15 outside temp was not pleasant. Have to give credit to good service when I come across it. Kelley Auto Group in Ft. Wayne got me in without an appointment and back on the road. Even washed the truck for me. It's cleaner than it has been in months.
User avatar
08H3
Trail Rider
Trail Rider
 
Posts: 216
Joined: Wed Feb 25, 2009 6:49 pm

Re: HVAC Blower quit working.

Postby stjames151 » Mon Jan 04, 2010 8:22 pm

At least its fixable. Most of the H1's I've been in must've used the same 24v blower motor as the HMMWV and it sucks under all circumstances.
I finally know my calling in life! I'm an a asshole!
I feel sorry for all the soldiers and intelligence officers who over the last century have worked hard to defeat communism, only to have it elected by "choice".
User avatar
stjames151
Club Member
Club Member
 
Posts: 1843
Joined: Wed Sep 26, 2007 11:43 am
Location: Here...."Amusing" the Retards
Vehicle: El Peo Chiquito

Re: HVAC Blower quit working.

Postby CBphoto » Wed Jan 06, 2010 8:17 pm

Glad they got it, that was actually a simple one...mine went out before, just lower the glovebox & unscrew the resistor from the airpassage, it's usually VERY obvious when it goes bad...only takes 5 minutes to fix.
'10 H3T Alpha, 35" Cooper STT's, 4:1 t-case, cranked, Hunner Xtreme Skids, AirDoc, Highmount Winchmount, Warn xd9000i, Lots-O-Line-X, X-Tang bed cover, UCP, what'd I miss?
'06 Green H3 Adv., now retired (to my 16 yr old), he'll wreck it soon, I imagine...but he'll live, I pray.

Hummer X Club Michigan Chapter
michigan@hummerxclub.com
User avatar
CBphoto
Chapter President - Michigan
Chapter President - Michigan
 
Posts: 824
Joined: Tue Nov 14, 2006 1:07 pm
Location: SE Michigan


Return to H3 Tech

Who is online

Users browsing this forum: MSNbot Media and 4 guests