a/c blower motor changing speed on it's own.

HavaTITAN · 08-19-2009, 04:56 PM

I have an '08.5 xe crew and when it's hot out the fan blower motor jumps from med to high by itself for a few seconds then goes back to med. It does this a few times, is this normal? My '04 did not do this.

mmtitan · 08-19-2009, 05:03 PM

My 05 does it

HavaTITAN · 08-19-2009, 05:20 PM

Is there a reason for this

. I would call my dealer service dep. but they couldn't find there asses with both hands.

vilim12 · 08-19-2009, 06:37 PM

My 08 doesnt do this, is your AC set on auto?

mmtitan · 08-19-2009, 06:44 PM

Mine doesn't have auto

**walleeme** · 08-19-2009, 06:51 PM

Mine does it too.
I read here somewhere that it has to do with some sort of a heat sink for the fan motor or something like that.
When it gets hot, the fan speeds up to cool it.
When the A/C is on, it stays cool all the time so the speed stays the same.

I tried to search out the thread with no luck yet.
I do know that the thread was posted back when there was a SoCal Titan meet at Huntington Beach last spring. I think it was the same day the event took place.

HavaTITAN · 08-19-2009, 08:06 PM

Quote:

Originally Posted by walleeme

Mine does it too.
I read here somewhere that it has to do with some sort of a heat sink for the fan motor or something like that.
When it gets hot, the fan speeds up to cool it.
When the A/C is on, it stays cool all the time so the speed stays the same.

I tried to search out the thread with no luck yet.
I do know that the thread was posted back when there was a SoCal Titan meet at Huntington Beach last spring. I think it was the same day the event took place.

Mine does it with the a/c on, I don't have an auto setting it's an xe.

LoveHammer · 08-20-2009, 10:32 AM

I have an 08.5 and mine would do this every once in a while but it has been happening more frequently so I took it in to the dealer. They looked at the truck and said that there is a "3 pin resistor that needs to be replaced with a 5 pin resistor" - exactly what the service manager told me, no more details. He said the 3 pin resistors have a tendency to overheat and cause the fan speed problem. They were able to duplicate the problem. The part was ordered and will be replaced on Monday. He said the repair will take less than an hour. Hope this helps.

Rolex · 08-20-2009, 11:11 AM

My 08' Pro 4X does it. As long as the a/c blows cold I'm good.

vilim12 · 08-20-2009, 12:20 PM

maybe i just havent noticed it then lol

54warrior · 08-20-2009, 12:57 PM

I would like to know why mine blows hot air through the vents even when everything is turned completely OFF.

LoveHammer · 08-20-2009, 02:58 PM

I just picked up my truck from the dealer. I misunderstood him on the phone, he must have said "fin" instead of "pin". I have the 3 fin heater switch resistor and there is an improved 5 fin replacement available.

I read on the invoice that there is apparently a tech. bulletin on this issue. NTB09-011 more info here: NTB09-011 - Nissanhelp.com

HavaTITAN · 08-20-2009, 04:34 PM

Cool, thanks for the info. I'm going in for an oil change tomorow, I will have them check it out.

**walleeme** · 08-20-2009, 05:09 PM

Quote:

Originally Posted by HavaTITAN

Cool, thanks for the info. I'm going in for an oil change tomorow, I will have them check it out.

Good luck with that.
Please report back and let us know what they find out.

**OneQuick06** · 08-20-2009, 05:41 PM

Quote:

Originally Posted by 54warrior

I would like to know why mine blows hot air through the vents even when everything is turned completely OFF.

Does it blow, or just flow through? I'm not sure, but I think the baffles don't shut after you turn the AC off. It seems that it allows fresh air to flow through the vents as you drive.