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Author Topic: 12-volt fan motor (range hood)  (Read 5428 times)

scottydl

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12-volt fan motor (range hood)
« on: March 31, 2008, 09:26:35 AM »
My range hood exhaust fan (above the stove burners) has never worked, and I assume the motor itself is fried.  I removed it the other day and am wondering where to find a 12-volt replacement fan motor.  Anyone ever replaced one of these?  The fan and motor are not unlike a roof vent fan... it may be the same thing adapted for the range hood.  I couldn't find anything 12-volt at Menard's yesterday and plan on trying Ace Hardware today, but I figured I'd ask in case someone has experience replacing these.  See photo of what the small motor looks like -
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PancakeBill

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Re: 12-volt fan motor (range hood)
« Reply #1 on: March 31, 2008, 09:36:47 AM »
I don't remember the name of the place, but I found replacement motors.  Look at the motor, there is likely a small component on the side, it is a temp sensor that will act like a fuse.  If the motor overheats it cuts out.  You may have a harder time replacing it than replacing the motor.  Mine was bad, but I found one in the parts bin in our service deppt.

As a last resort, you can replace the whole assembly hood and all for not much more than the motor.

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Jim Godward

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Re: 12-volt fan motor (range hood)
« Reply #2 on: March 31, 2008, 09:42:35 AM »
Sccotty, contact the hood manufacturer or take the motor to Grainger's, McMasters or possibly an appliance repair shop if you are in or near a larger city.
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scottydl

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Re: 12-volt fan motor (range hood)
« Reply #3 on: March 31, 2008, 10:04:16 AM »
As a last resort, you can replace the whole assembly hood and all for not much more than the motor.

Yikes.  I kinda thought this would be a $5 part but the trick would be finding it (12 volt and all).  The motor is small, maybe 1.5" in diameter and 3" long.  The 12-volt nature made me think away from standard appliance repair places, but I'll give them a try.  This motor in particular is a Jensen (who usually makes cheap audio components) and has all the specs printed on a label.  Hopefully that will help me find the right replacement.
Scott, wife, 3 boys... and the dog
1994 Thor Residency 3500 owned 2007-2012
Now looking for the next perfect RV...

Karl

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Re: 12-volt fan motor (range hood)
« Reply #4 on: March 31, 2008, 10:26:52 AM »
Scotty,
Something is out of kilter. You said it's a Jensen part but show a Bosch motor. Which is it? What is the model number/part number?
Karl (Cheesehead) Kolbus   Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "...holy cow ...what a ride!"

King

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Re: 12-volt fan motor (range hood)
« Reply #5 on: March 31, 2008, 11:54:59 AM »
"has never worked"
If you havn't done so, Before getting a replacement, I would check the motor alone with 12 volts.
Art

scottydl

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Re: 12-volt fan motor (range hood)
« Reply #6 on: March 31, 2008, 12:33:42 PM »
"has never worked"
If you havn't done so, Before getting a replacement, I would check the motor alone with 12 volts.

Very good point... I just did so, and I get nothin' from the motor.  The wiring is pretty simple and all the other hood switches work (light, FW pump, tank monitor panel) so I had previously narrowed it down to the motor itself that way.

Scotty,
Something is out of kilter. You said it's a Jensen part but show a Bosch motor. Which is it? What is the model number/part number?

The Bosch photo is from Google Images, just a similar looking motor (not the one I have).  Sorry I didn't clarify.  ;)  Here are the specs on my Jensen fan motor:

Model No. HR475E3
Jensen No. 42-472-01
Voltage: 12 DC
Amperage: 1.3 amp
Date of Mfg: 7 Dec 93

Google turns up nothing useful on that "Model No." or "Jensen No."... I don't care at all if I get an exact brand/model replacement, I just want something that fits and works the same.
« Last Edit: March 31, 2008, 12:36:40 PM by scottydl »
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Gary RV Roamer

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Re: 12-volt fan motor (range hood)
« Reply #7 on: March 31, 2008, 01:42:14 PM »
A lot of electronic stuff uses 12v motors inside - computers, for example. There are lots of 12v fans on the market, so check around. Ought to be able to find something that  can be adapted to it. And an electronics cooling  fan will be a lot quieter than your original - they were notoriously loud and rather ineffective to boot.
Gary
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dhamblet

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Re: 12-volt fan motor (range hood)
« Reply #8 on: March 31, 2008, 01:42:38 PM »
Check with RV Parts Mall in Sarasota FL at 941 359-2581
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Karl

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Re: 12-volt fan motor (range hood)
« Reply #9 on: April 01, 2008, 05:05:24 AM »
If it looks exactly like the Bosch motor, try a foreign car dealer's parts department. Bosch motors are used extensively in them. I would guess that to be a windshield wiper motor, or for a gate lift or window lift. That be me, I'd take it apart and check the brushes and commutator for corrosion or a bad connection. Unlikely that the winding would burn out, and worn brushes can be replaced. It may just require lubrication. Did you check if it is drawing any current?
Karl (Cheesehead) Kolbus   Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "...holy cow ...what a ride!"

scottydl

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Re: 12-volt fan motor (range hood)
« Reply #10 on: April 01, 2008, 07:48:05 AM »
It's not exactly like the Bosch... I just posted that to illustrate what shape/style of motor it is.  Computer cooling fans are a dime a dozen (and pretty quiet as Gary mentioned), so if those are rated at the same voltage maybe I'll go that route.  How close does the amperage need to be to the original?  Exactly 1.3a, or can I give or take a few tenths?  Honestly I did not figure the original-style motor would be so hard to find.  I have a 12v clip-on fan in the RV that I never use, so I could try to raid the motor from that too.
Scott, wife, 3 boys... and the dog
1994 Thor Residency 3500 owned 2007-2012
Now looking for the next perfect RV...

Karl

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Re: 12-volt fan motor (range hood)
« Reply #11 on: April 01, 2008, 09:01:03 AM »
Computer fans don't have nearly the power or CFM's to do the job.
Karl (Cheesehead) Kolbus   Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "...holy cow ...what a ride!"

Lou Schneider

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Re: 12-volt fan motor (range hood)
« Reply #12 on: April 01, 2008, 11:25:37 PM »
I'll agree with you as far as the tiny 3" fans that are common in PC power supplies, Karl.  But I've had really good luck swapping out the original exhaust fan with a 4 3/4" 12 volt muffin fan like these.

Judging by the amount of steam removed from the stove, how hard they seem to blow against my hand, and how far the outside flap blew open with the muffin fan vs. the orignal, the 4 3/4" fan I used has airflow comparable to the original noisy fan it replaced.

Scottydl - don't sweat the amperage except - if you have several fans to choose from, the one with the higher amperage will usually move more air.  But almost any 4 3/4" fan will do a good job.
« Last Edit: April 01, 2008, 11:32:58 PM by Lou Schneider »

Karl

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Re: 12-volt fan motor (range hood)
« Reply #13 on: April 02, 2008, 05:48:04 AM »
Lou,
Maybe those fans are more powerful than the ones I bought in Quartzsite. Mine will move air well enough, but wouldn't have the oomph to open the vent flap.
Karl (Cheesehead) Kolbus   Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "...holy cow ...what a ride!"

scottydl

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Re: 12-volt fan motor (range hood)
« Reply #14 on: April 17, 2008, 12:03:02 AM »
Problem solved.  The previous owner of my rig had included a 12-volt clip on oscillating fan (like the one pictured below), which was horribly loud and I never used.  Until now.  I disassembled it to get to the motor, and what do you know... it was nearly identical to the range hood fan motor that never worked!  A little modification and I now have a working fan over my stove burners again.  Total cost = $0.  ;D
« Last Edit: April 17, 2008, 12:12:04 AM by scottydl »
Scott, wife, 3 boys... and the dog
1994 Thor Residency 3500 owned 2007-2012
Now looking for the next perfect RV...