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zelch x Profile
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Date Registered: 10-2009
Location: Canberra, ACT
TOTAL POSTS: 7
Heater unit or blower motor??? Help please


Hi everyone,

I have been reading through the forum about the topic but can't diagnose with my limited electrics knowledge.

One day my fan kept going at full speed even though I turned the unit off. No adjusting of the speed does anything, however, adjusting the mode works.

I even pulled the unit out to have a look and after totally being disconnected from the dash the fans were still running at full speed. The only time they turn off is if I take out the fuses.

How can I best check where the problem lies without spending money for a mechanic or electrician to check? If it's just the heater unit is there an easy way to fix without buying a new unit which I got quoted over $600???

Thanks Zel

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2003 Nissan X Trail T30 Ti
16/Oct/2009, 7:12 pm Link to this post Send Email PM   Send Private Message
 
zelch x Profile
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Date Registered: 10-2009
Location: Canberra, ACT
TOTAL POSTS: 7
Re: Heater unit or blower motor??? Help please


By the way, I left out the important bit which might make all the difference. It's a automatic airconditioning unit out of the 2003 Ti. Digital display, climate control etc. Am I screwed? haha

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2003 Nissan X Trail T30 Ti
16/Oct/2009, 7:36 pm Link to this post Send Email PM   Send Private Message
 
basshead Profile
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Date Registered: 02-2004
Location: Panania, Sydney
TOTAL POSTS: 2852
Re: Heater unit or blower motor??? Help please


I was going to point you in the direction of existing thread(s) but then you mentioned it's the climate control version.


At the end of the day, it's still likely to be resistor switching failure - even though the climate control might be "elecronic", there would still be resistors and mechanical switching of those resistors like the "povo pack" ST version.



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Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_YokoGeoA/T-S_TBS_bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory.
16/Oct/2009, 8:06 pm Link to this post Send Email PM   Send Private Message MSN Yahoo Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
Re: Heater unit or blower motor??? Help please


Hi Zel,

It's a blown fan resistor, the part number for the Ti resistor which has climate control is mentioned HERE

You're looking at around $165.00 for it from the dealer and you can change it yourself too and save some $$$

Last edited by jalalski, 16/Oct/2009, 9:13 pm


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16/Oct/2009, 9:12 pm Link to this post Send Private Message MSN Blog
 
zelch x Profile
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Date Registered: 10-2009
Location: Canberra, ACT
TOTAL POSTS: 7
Re: Heater unit or blower motor??? Help please


Thanks guys! I will look into it. I'm just glad that I don't have to buy a new unit to fix the problem.

I guess I was mainly worried that because the fans were still going when the whole unit was disconnected the problem lay somewhere else, but that's probably because of my lack of electrics knowledge with how these systems work.

Any tips on best place to order this part from, phone number por web address?

Thanks again, Zel

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17/Oct/2009, 9:48 am Link to this post Send Email PM   Send Private Message
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
Re: Heater unit or blower motor??? Help please


quote:

zelch x wrote:
I guess I was mainly worried that because the fans were still going when the whole unit was disconnected the problem lay somewhere else, but that's probably because of my lack of electrics knowledge with how these systems work.



Hi Zel,

Can you explain this part a little more for me please.
When you say "the fans were still going when the whole unit was disconnected" I presume all the wires were disconnected so it is difficult to understand how the fan would still be running without power.

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Kev X450(c) T30 Guru
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17/Oct/2009, 10:29 am Link to this post Send Email PM   Send Private Message Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
Re: Heater unit or blower motor??? Help please


Kev,

I think Zel was referring to the radiator fans.

Zel, call your nearest Nissan dealer, give them the part number mentioned and get a price for it. You can't find that resistor after-market.

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17/Oct/2009, 12:06 pm Link to this post Send Private Message MSN Blog
 
zelch x Profile
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Date Registered: 10-2009
Location: Canberra, ACT
TOTAL POSTS: 7
Re: Heater unit or blower motor??? Help please


Unfortunately it is not the radiator fans. I have disconnected the climate control unit via the two plugs behind it and pulled the whole thing out of the car to inspect the circuit board. Unless I pull out the fuses the blower motor behind the glove box keeps running on full... ???? I'm stumped, I would have thought that dosconnecting the unit would turn it off. Is this then possibly something to do with the blower motor and not the unit at all? The radiator fans aren't running, the car ignition is on (on 3).

Thanks again

Zel

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2003 Nissan X Trail T30 Ti
17/Oct/2009, 2:50 pm Link to this post Send Email PM   Send Private Message
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
Re: Heater unit or blower motor??? Help please


If it is the blower fan that is constantly running, then you probably have a short circuit. It would still pay off to check the blower fan resistor. You can visually check it by removing the glovebox.

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17/Oct/2009, 3:00 pm Link to this post Send Private Message MSN Blog
 
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Date Registered: 06-2008
Location: Blue Mountains, NSW
TOTAL POSTS: 5966
Re: Heater unit or blower motor??? Help please


This sounds too wierd for me.
I would just take it to an auto electrician and he might tell you something totaly different.
It might even cost you nothing for him to just check it out.
Peace of mind knowing from the start.

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Tony X-891c

HERE is my D22 Navara
HERE is my old 2008 T31, ST Series1

17/Oct/2009, 3:29 pm Link to this post Send Private Message
 



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