View Full Version : Heater Motor Resistor Question(s)


skyeglen
02-15-2009, 11:31 AM
I have an '06 LT with over 81,000 miles and the heater motor just quit working on the lower speeds. I used the search and found 17 pages of posts on heater problems and it appears to be a blown resistor causing the heater to only run on the hi speed.

Because I'm waaaay out of warranty I would rather not take it to the dealer like most of the ones with this problem have done. Does anyone know where the resistor is located and/or have any info on the type, size or part number for this resistor? :confused:

Thanks,

Dan

TomsHHR
02-15-2009, 12:19 PM
when it goes out you have hi and off. The resistor is close to the heater on the firewall/floor area

skyeglen
02-15-2009, 01:17 PM
Thanks Tom, I'll poke around that area and see if I can locate it.

ChevyMgr
02-15-2009, 01:33 PM
Usually a water leak is the cause of the resistor blowing. Here is a thread that can help you with both.

http://chevyhhr.net/forums/showthread.php?t=14263

Lucky
02-15-2009, 04:09 PM
Here you go :thumb:

skyeglen
02-15-2009, 07:25 PM
Thanks Guys. Didn't find any water on the carpet or floor mat and couldn't feel any on top of the carpet thingy that covers the bottom of the blower motor. It didn't get much above 20 degrees today so I didn't spend too much time outside looking into it.

Tomorrow I'll get down to that rubber cover and get the resistor pulled out. Is there any way to check the resistor with some type of meter to see it it is bad?

Chevy Mgr, thanks for that link, I must have missed it in the 17 pages of threads I read after doing a search.

Lucky
02-15-2009, 08:18 PM
you can check it with a dvom. here is the wirring diag. but I'm sure that if you replace the resistor your blower problem will be corrected. :smile:

skyeglen
02-16-2009, 09:36 AM
Thanks Lucky. I pulled the cabin filter out and it was dry as a bone with no evidence of any water spotting or moisture. There was no evidence of any moisture around the resistor area, fan moror area, firewall or carpet.


I was able to pull the resistor with one hand thru the glove box opening holding the retaining clip open and one hand from underneath pulling the resistor down. Local Chev dealer had 1 in stock for $50.15, Part # 158189-10. Much closer Napa dealer did not have 1 in stock was was only $36 plus $6 shipping from Va. Would have been 2 days but Post Office is closed today so will probably be 3 days. It's cold enough here to run the heater on high anyway so I'll wait for NAPA.

The cabin filter was slightly gray and had 3 pine needles trapped after 26,000 miles and 1 year. I had a new one on the shelf and put that in, but did notice that they are now "Made in USA". The last one from NAPA was made in Poland.

ZTony8
02-16-2009, 09:43 AM
Skyeglen,your local Chevy dealer is boning you.Regular list on #15818910 is $40.97(plus tax).

skyeglen
02-16-2009, 09:51 AM
Oh yeah. Sometimes he's the only game in town... like the $30.32 rear wiper blade insert, all 10 1/4 inches of it. That was b/4 any of the parts stores carried that item. Definitely pays to check around.

Radssmith
02-16-2009, 02:01 PM
My 2006 LT had the same problem until last week when the blower just stopped working at all.....it was a Cooooold ride in this morning.
I found the motor and resistor at Autopart Giant (AC Delco) for 157.00 with free shipping. I am going to attempt to change mine when they arrive. There is alot of info on the change out in these forums and feel confident the swap should go fairly easy.
The problem is with water coming in the cowl area, got to fix that before I put in the new one. You may want to look into that before changing your blower or resistor.

skyeglen
02-16-2009, 04:05 PM
Thanks for the info on AutoGiant. Seems like a good price with resistor alone being $40 to $50, depending where ya go. I'll pull that cover on the cowl and reseal the rubber with RTV at the first sign of any water getting in or in the spring when it gets warmer.... whichever comes first. :thumb:

Radssmith
02-16-2009, 05:53 PM
I have the same weather issue..........too cold and too old to be laying on the ground to get at the passenger side !!
:thumb:

skyeglen
02-18-2009, 04:30 PM
Cold & Old.... that would be me;)..

Resistor from NAPA, via Va., arrived this afternoon. Having previous "practice" at putting it in and pulling the old one out it took about a minute to swap the non working one for the new one. Works perfectly. No idea why it quit but there is no evidence anywhere of any water leaking in as I stated previously.

Just something to keep in mind that they can malfunction w/o any water present. However I will still pull the cowl cover piece off in the spring and check or reseal the rubber cover to prevent any future leaks.

Thanks agan to all for the advise and suggestions. :thumb:

shaginwgn
02-22-2009, 04:21 PM
Resistor from NAPA, via Va., arrived this afternoon. Having previous "practice" at putting it in and pulling the old one out it took about a minute to swap the non working one for the new one. Works perfectly.

I work at a NAPA store and we get a good amount of customers with blown blower motor resistors usually 05-06 chevy trucks. It seems to me it is design flaw with them and tried to reinvent the wheel with the resistors in the first place.

skyeglen
02-22-2009, 08:11 PM
Local NAPA dealer said he's only had a couple calls for resistors.. But, he's only been open a little less than a year. He will try to keep 1 in stock if he gets a couple more requests.

After 13 months and over 30,000 miles the resistor was the first $$$ I've spent on the HHR that was not my choice so I'm sure not complaining.... (Not counting oil, filters & regular maintenance items.) :thumb:

shaginwgn
02-22-2009, 08:31 PM
Local NAPA dealer said he's only had a couple calls for resistors.. But, he's only been open a little less than a year. He will try to keep 1 in stock if he gets a couple more requests.

Make sure it is the right one such as connector plug-in and mounts are the same and located on same spot before installing because most stores have policy on electrical parts if installed no returns/refunds. Sometimes they don't match haven't checked the listing on HHR to see if they match or not just a heads up.

Radssmith
03-03-2009, 06:56 PM
Just finished mine tonite, new blower motor & resistor......fixed the collasped cowl heater box seal. What a lousy piece of design that is......the cowl seal had fallen into the cabin filter, there is a water level line on the resistor, the blower motor cover and motor are covered in moss or mold......Everything was soaked and it hasn't snowed in a week. Now, with everything changed and dried out..........the frickin fan still doesn't work at any speed.
I did take a piece of sheet stock aluminium and put it on my brake, making two light "X" patterns on the sheet for support. Then using the old patch as a template, I trimmed the aluminium about 1/4 larger than the patch, this piece covering the patch and sealed with RTV will keep the seal from falling in from snow or rain.
I gave up at dark at the fuse box, there must be a relay or fuse that is blown from the water damage to the motor & resistor. I can't understand why I have no power at the blower motor........but, that is an awful design...Chevy should fix everyone with the collapsed cowl heater box seal for free.

ZTony8
03-04-2009, 08:39 AM
Blower resistor failure is quite common now across the GM line.

solman98
03-04-2009, 08:52 AM
Just finished mine tonite, new blower motor & resistor......fixed the collasped cowl heater box seal. What a lousy piece of design that is......the cowl seal had fallen into the cabin filter, there is a water level line on the resistor, the blower motor cover and motor are covered in moss or mold......Everything was soaked and it hasn't snowed in a week. Now, with everything changed and dried out..........the frickin fan still doesn't work at any speed.
I did take a piece of sheet stock aluminium and put it on my brake, making two light "X" patterns on the sheet for support. Then using the old patch as a template, I trimmed the aluminium about 1/4 larger than the patch, this piece covering the patch and sealed with RTV will keep the seal from falling in from snow or rain.
I gave up at dark at the fuse box, there must be a relay or fuse that is blown from the water damage to the motor & resistor. I can't understand why I have no power at the blower motor........but, that is an awful design...Chevy should fix everyone with the collapsed cowl heater box seal for free.
And shame on Shaheen Chevy in Lansing for wanting $469.00 last week when I spoke to them about replacing my blower motor from water damage and never telling me about the TSB on this. This board is full of great information, took me 20 minutes to find out how and why it was leaking and the TSB.
My wife wants an HHR, Shaheen Chevrolet will not be where it is purchased. Angry letter to them to follow.............

This past December, my fan quit working on any speed. It ended up being a fuse in the at the BCM. Dealership swapped it out when I took it in. Sorry can't tell you which fuse it was. If I had of know it was only a fuse, I would have just did it myself. But took it in since I still have a warranty.

This past Monday, they had to swap out the blower. It was starting to squeel...... Wonder if that is why the fuse blew the first time.......

Radssmith
03-05-2009, 04:44 PM
:( Made a phone call to Shaheen Chevy, kinda ticked off........okay, very P.O'ed. And whoa and behold my HHR is in their shop and I have a loaner. They are disassembling the HVAC system and cleaning it and doing any and all repairs caused by water intrusion. Plus paying me back for the AC Delco parts (always buy the Good stuff)..Gratis.
The knowledge gained on this forum was the key......incredible. If your HHR is leaking or your fan speed is acting up, contact your Chevy dealer. I don't care how many miles are on it. Make them fix it, the seal will fail in any heavy rain or snow unless they do.
Shaheen is trying their best to make sure I am happy, and by God if your in your HHR.....you should be happy !:smile:

Dave C
03-09-2009, 05:45 PM
Local NAPA dealer said he's only had a couple calls for resistors.. But, he's only been open a little less than a year. He will try to keep 1 in stock if he gets a couple more requests.

After 13 months and over 30,000 miles the resistor was the first $$$ I've spent on the HHR that was not my choice so I'm sure not complaining.... (Not counting oil, filters & regular maintenance items.) :thumb:
What's the NAPA part number for the heater resistor ? ?
Thanks, Dave

zephyrHHR
02-20-2010, 06:09 PM
Righteous! Resistor fixed the fan problem. :bow: now gotta fix that leak!

Doug

DaveB
12-07-2010, 07:29 AM
I just ordered my new resistor from ebay, GM part for 23.95 and free ship. I too fixed the crappy cowl patch. I cleaned cowl area and patch with starter fluid (Ether) first and sealed with a tube of clear silicone and it's "Dry as a Bone" so far???

Waldo
01-04-2011, 11:30 AM
My daughter takes the HHR away to college. While she's home for Christmas break, I was planning on taking it on a trip to Columbus, Ohio - 600 miles each way - the day after Christmas. Christmas day, the whole family piles into it for the family get together, and I notice the heater fan is only blowing on high. I ask her about it, and get the, "Oh. I forgot. It's been doing that for a while." response. Not having time to look it over, I take my pickup on the trip (spending a bit more on gas...). When I get back, I did a search here and found out about the resistor. A call to NAPA and they tell me they'll have one the next morning. Having already pulled out the insulator, I replaced it right in the parking lot.

All speeds working!

Thanks everyone!

skyeglen
01-04-2011, 08:38 PM
Waldo, the usual culprit for a fried resistor is water leaking in thru the cowl area. The water usually ruins the heater fan motor also.

Didn't see what year your HHR is but the leaking cowl happens on the '06 and early '07's. I belive they changed the design mid '07 and there were no leak problems after that.

There is a good how to for the repair in the how to section if you have one of the years affected.

Alvis
09-28-2013, 04:47 PM
Would someone please tell me the resistance specs for the 4 pins of the blower resistor for a 2007 HHR? I want to confirm that mine is shot before I buy a new one.

firemangeorge
09-28-2013, 05:39 PM
Alvis. Alvis. Alvis. So. You didn't believe me and donbrew? :lol:

All kidding aside. Most folks just replace the resistor. 99.9% of the time that's what it is if the blower only works on high.
Sorry, I don't have the specs on the that resistor. It's just considered a disposable part.

Alvis
09-28-2013, 07:34 PM
lol. I'd rather not walk out of the parts store with a $25-50 disposable part and later learn that I didn't need to buy it.

I'll guess that a good resistor will measure under 100 ohms per circuit, and a bad resistor will measure over 1,000 ohms on the bad circuits.

843de
09-28-2013, 08:23 PM
Even after poking around in the FSM and Mitchell, the exact resistance specs of that part remain elusive, it's a disposable piece with a well defined failure mode.

All that being said, here's a link to ASE's training guide for diagnosing a bad blower motor resistor using a VOM.

http://www.freeasestudyguides.com/blower-motor-resistor.html

whopper
09-28-2013, 08:56 PM
Alvis. Alvis. Alvis. So. You didn't believe me and donbrew? :lol:

All kidding aside. Most folks just replace the resistor. 99.9% of the time that's what it is if the blower only works on high.
Sorry, I don't have the specs on the that resistor. It's just considered a disposable part.

X2 - it's not rocket science.

843de
09-28-2013, 08:59 PM
Well.........

http://www.ponweb.com/wp-content/uploads/2010/11/34851.jpg

whopper
09-28-2013, 09:11 PM
LOL - that's one of my favorites, next to the rubber chicken ranch one.

Alvis
09-30-2013, 08:14 PM
To 843de and whopper:
No, it’s not rocket science, but science it is! I'm sure the electrical engineers would agree. Good comic!

To 843de:
Thanks for the diagnosis info. I measured the resistance between the four pins of my old HVAC blower motor resistor, and got either 0 ohms or infinite ohms (open circuit). That was sufficient evidence for me to run down to my local NAPA Auto Parts store and buy a resistor for $42.29 (part number BR367). Maybe I could have bought it online from the GM Parts Department web site for less, but I didn’t want to wait for it, and I did want to keep my local store in business.

The new resistor measured 0 ohms between all four pins. This was surprising to me, as I expected to find measurements of 2-10 ohms. I don’t get it (how a resistor can have 0 resistance), but I'll try to not lose sleep over it.

I had a tough time getting the resistor out of the HVAC housing. It is retained by two tabs that keep the resistor from falling straight down (no screws of the kind MrCatPC described on post "Water leak front passenger floor"). One tab is forward of the resistor to the driver’s side, and the other is rearward of the resistor to the passenger side. The location of the resistor makes it awkward to reach, and I didn’t even see the black tabs of the black housing in marginal lighting conditions. This is a bifocal-wearer’s nightmare! I was attempting to release the electrical connector from the resistor by unclipping the third tab, which is rearward of the resistor and on center, when I inadvertently dislodged the resistor from the HVAC housing. Fortunately, I didn’t break anything in the process.

Bottom line: if you measure infinite resistance (open circuit) between any of the four resistor pins, then it’s time for a new resistor.

firemangeorge and donbrew ("Water leak front passenger floor") GUESSED correctly!

843de
09-30-2013, 09:28 PM
:twothumbs: Glad you got it diagnosed Alvis, and for not taking that cartoon the wrong way, sometimes a little levity gets mixed in with the technical stuff here.