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Nissan Primera P12 Fan Blower stuck on FULL
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ryteker View Drop Down
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    Posted: 10 Nov 2012 at 8:48am

Hello all, I have a Nissan Primera 2002 plate 2.2 Diesel estate ....

The Air Con had stopped working over a year ago, but being told by the dealership that it could cost up to £1400 to 'fix it' decided that it was not worth it, so didn't bother.

A couple of months ago, the Fan blower stopped working and again was told it would be around £45 for the part and £80 to 'fit it' etc. but the 'engineer' explained it was probably the control unit and it was easy to fit myself .... (but under his breath said ... check out CPOC for a solution .... wink, wink)

Already having registered with NPOC did a search and found the superb instructions on how to remove and repair the Fan Control Unit, got the parts and fixed it, and also replaced the pollen filter as suggested .... all worked well.

 

Then, yesterday, I took the car into an 'Air Con' specialist garage for them to check it out, they tested the Pump which appeared to be ok. but the 'gas' was very low, so they 'drained' it and did a vacuum check, which was also ok, they then re-gassed the system, re-checked it, and put some sort of 'dye' in the gas with instructions that if it failed, to get it into them and they may be able to use 'ultra violet' to identify the dye if there is gas leak etc. .... but the Air Con was working again (after about 18 months)

 

As I was driving home, with Air Con on and the Fan blower at 2 bars, suddenly after about 10 minutes, (as though when the engine temperature reached a certain value), the Fan Blower went to Full Blower Power, even though there were still only 2 bars indicated on the control display.

Since then, I have not been able to control the fan speed at all, it is permanently on Full, even from when I turn on the Ignition.

 

I suspect the Fan Control Unit's power transistor has 'blown' to a 'short circuit' causing full power to be given to the Fan.

 

Has anybody experienced this type of a fault, found a solution, or has a circuit diagram of the Fan Control Module ?

 

I will take the Fan Control Unit apart again and 'reverse engineer' the circuit if there is not one available, and test and try to fix it .... I suspect (and hope) it was just a coincidence that it happened a the same time as the Air Con was 'fixed'.

 

Any help or advice would be greatly appreciated.

 

Roy
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Stevie-Boy View Drop Down
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Points: 42534 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Stevie-Boy Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2012 at 10:09am
Hi Roy and a big welcome to NPOC
 
I have edited your thread title and made sure it starts with "Nissan Primera P12.. (with further description)" - Please keep on top of that (it is explained in our forum rules):
 
http://www.npoc.co.uk/forum/forum-guidelines-rules_topic2&FID=1&PR=3.html
 
Point 2)
 
Many thanks and take care,
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Points: 1368 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Electrolyte Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2012 at 10:34am
Chances are that the insulation at the fuse has broken down allowing it to short to the heat sink.
Believe this happened to one other person when they repaired theres.
There is very little to the module ,the transistor looks like an IGFET so won't read like a normal transistor but certainly should not read a dead short across any of it's legs.
Along with that you have a couple of resistors , a diode ( which again should not read short ) and some capacitors.
If in doubt give it a clout!
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ryteker View Drop Down
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Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ryteker Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2012 at 11:15am

Hi Stevie-Boy,

Many thanks for that, this was my fist time posting so wasn't totally sure if it was correct, I'll check it with my next post.

 

Electrolyte,

Thank you for such a fast response to my post.  As it was this high temperature fuse that had 'blown' that I 'fixed' last time, it is looking quite probable that the insulation has broken down and created a short circuit as you suggest, and  it is just a coincidence that it was when the Air Con was sorted, or maybe disturbing things caused it, anyway, I  will check it out, probably on Monday or Tuesday and post my findings, and thanks again.

Roy

 
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Keep us updated thanks Thumbs Up
If in doubt give it a clout!
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This may be of help
http://www.npoc.co.uk/forum/p12-fan-speed-control-module-diy-repair_topic12795.html
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SteveL51 View Drop Down
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveL51 Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2012 at 3:40pm
Is there a link to a diy fix for a '95 P10?  My heater blower only works on No.4.
 
I'll do it tomorrow
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imckay View Drop Down
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Originally posted by SteveL51 SteveL51 wrote:

Is there a link to a diy fix for a '95 P10?  My heater blower only works on No.4.
 


This is for the P11 and P11-144
The P10 has a different shape card but the principle is the same.

http://www.npoc.co.uk/forum/nissan-primera-p11-144-heater-ac-issue_topic58428_post751771.html#751771
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Originally posted by ryteker ryteker wrote:

Hi Stevie-Boy,

Many thanks for that, this was my fist time posting so wasn't totally sure if it was correct, I'll check it with my next post.

 
Many thanks Roy Thumbs Up
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveL51 Quote  Post ReplyReply Direct Link To This Post Posted: 10 Nov 2012 at 5:21pm
Originally posted by imckay imckay wrote:

Originally posted by SteveL51 SteveL51 wrote:

Is there a link to a diy fix for a '95 P10?  My heater blower only works on No.4.
 


This is for the P11 and P11-144
The P10 has a different shape card but the principle is the same.

http://www.npoc.co.uk/forum/nissan-primera-p11-144-heater-ac-issue_topic58428_post751771.html#751771

Thanks for the info., I'll have a look.
I'll do it tomorrow
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