Question about Hummer H3

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2007 hummer h3,heater blower moter does not work at any speed,hi,low and medium,

Checked the fuse and relay-OK

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  • 54 Answers

Check underneath behind the glove box,there is a connector with a red input that might be burnt out.it happens with the h3

Posted on Aug 06, 2016

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Posted on Jan 02, 2017

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SOURCE: blower motor does not work

I had the same problem, replace, replace, replace. Check, check and recheck. What I found was the blower motor resistor, located in the blower squirrel cage area, two prongs and a curly wire, was bad. Took the new one back, (it ohmed out okay, continuity ok, all ok!) replaced it with another, and Bingo, problem solved. Frustrating to say the least. After two relays and a blower switch, and test, test and retest. It was a faulty resistor. Made in Mexico. And no guarentee, even though new, it works. Trial and error. Even the dealer parts are Honcho en Mexico. Thanks NAFTA. You gonna make us all welfare babies.

Posted on Sep 28, 2009

  • 12 Answers

SOURCE: I have high speed blower but no medium or low

It's likely a relay. I've often seen where the lower settings are ran through one relay and the higher setting ran through another because of the difference in amperage. I'd start there, the relays are often pretty cheap and a lot easier to replace than tearing the dash apart to change the switch.

Posted on Oct 09, 2009

swampthang90
  • 18 Answers

SOURCE: 2006 Hummer H3 a/c & heater fan/blower failed

Probably too late now, I am sure you have already fixed it, but mine did this and it was an electrical part that is mounted right beside the blower fan. The part was OK, but the plug into the part was arcing and burned out the connection. A Chevy mechanic told me this has been happening to MANY Chevy products. I had to buy a new part and plug assembly with new wires, about 100 dollars, and I spliced them together. It was an Easy fix, but I shouldn't have had to do it :(

Posted on Mar 07, 2010

  • 1 Answer

SOURCE: (06 Hummer H3) Blower not working, Clutch Keeps blowing fuse.

I assume you've fixed this already given that nearly a year has passer by, but if others experience this, it may help them. Under the dashboard on the passenger side there is a Fan Blower resistor attached to a red connector with 5-7 colored wires. Its held in by two simple screws. Disconnect the connector and inspect it for any burn marks(usually the last orange wire at the end). If this is discolored go to the nearest GM dealer and by about $70 worth of parts. The blower resistor, the red harness connector and the clips that go into the connector. Job takes under an hour and would be rated at novice-intermediate. Advice: set the passenger chair back as far as possible. Remove the harness clips carefully so as not to break them. For more workspace you can easily pull out the plastic facia on the right hand side, it easily slips out from under the foot rail, do not be intimidated there are no hidden screws. There is also a relay down there; a small black box held in by one screw, you might as well change this while you're down there. A dealer may charge as much as $400 for this simple fix!

Posted on Jul 19, 2010

SOURCE: winshield wiper works on high

This solution applies specifically to a 91 Ranger with delay wipers, but may apply to other years as well:

There is a "cold solder" joint on the wiper control module that should be investigated whenever intermittent wiper issues crop up. I dont have the ability to post a schematic, but it is one of the leads that come off of the main terminal, and is fairly large. The solder around the lead will look dull and will most likely show physical separation from the circuit board itself. Re-solder with a good hot iron and it may well cure what ails ya. Takes 30-45 minutes, depending on how adept you are at worming your way under the dash to retrieve the module. It's to the left of the ashtray about 6 inches.

Posted on Jun 08, 2012

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1 Answer

My power seat stop working I can't find a fuse box in a 2007 h3 Hummer


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You checked the fuse and relay, did you check to see if you had power at the resistor ?
American built vehicles control fan speed by the power circuit which goes thru the resistor. The high speed usually bypasses the resistor.
You may need a new blower motor or control switch.

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Blower motor will not blow fuse relay motor are ok


it could be that the motor itself is bad there is a relay inside the motor as well give these websites a try www.alldatadiy.com and www.autozone.com if it was me i would checkout one at a good salvage yard give this website a try to find one close to you give this website a try www.junkyarddog.com wish you the best of luck Michigan Man.

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SOUND LIKE BLOWER MOTOR GOING BAD.OR SHORT IN HEATER AND AC CONTROL SWITCH.

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There are two relays for the heater control fan,a low blower relay and a high blower relay.It sounds like the hi blower relay is bad.

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The airconditioner only works in my 2006 H3 when the car is physically moving over 25 mph. If it is going slow or idling there is no air coming from the blower/fan. When it does blow it is only on a low...


There is a HVAC relay and FUSE in the under hood fuse box, have you check both of these? If the blower works on any speed, the blower is good. You say it blows on lowest speed? The blower speed resistor is mounted on the blower housing. The HIGH SPEED BLOWER RELAY is mounted on the blower motor. You may have multiple problems but check fuses first, if all is OK, then a qualified repair shop will need to check further. You do NOT need the whole A/C system replaced. If it does blow cold, thats good, you just need the blower working.

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I have a 2007 H3 hummer, suddenly my fan does


It's the HVAC blower resistor in the air plenum under the glovebox. New resistor and wiring harness is about $70 at the Hummer Dealer.

Sep 10, 2009 | 2006 Hummer H3

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I HAVE AN 06 H3 HUMMER the heater was blowing fine when I shut the car off ok, when I got back in and started it the heaters blower stopped. I have checked all fuses and relays and they are fine I even...


check the blower speed control, it most likely burned out, also jump battery power direct to the blower and see if it runs, if it does the speed control is defective, if it doesn't the blower motor is toast.

Jan 16, 2009 | 2008 Hummer H3

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