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2001 v70 cabin fan blows constant

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R

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SandCastle
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Year and Model: 2001 v70 t5
Location: SW Middle TN

2001 v70 cabin fan blows constant

Post by SandCastle »

2001 v70 a/c climate fan blows continuously - drained the battery.
From other postings, I thought it was the climate control unit gone bad. I bought one used (same 9452369 part number) and put it in today.
Applied battery power and the fan came right on again. Took it for a 15-minute test drive, no difference.
Removed the negative cable and pulled the climate control unit.
Then I had the idea of putting the negative cable back on and, much to my chagrin, the fan is blowing again. :oops:
With a large hole in the dash where the climate control unit should be. Needless to say, the negative cable is disconnected now.
What the hello is going on with this? Worse, what is it going to take to fix it?
I need to keep the car on the road; any suggestions are greatly appreciated!
Donald

jimmy57
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Post by jimmy57 »

The power unit for fan, it is the transistor that the CCM regulates fan with, is mounted with the blower motor and is the usual cause. Since it does it without CCM installed then it pretty much assures it. The fan is fed 12V+ direct so all it takes is that circuit fusing and the fan runs. Not always, but with some regularity, the fan is drawing too much current and it is the cause of the failure. Original fan and 200K mile range means it would not be any waste to replace it anyway.

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Post by oragex »

As above, it may the the resistor on the blower unit, the metal piece with many pins on it. Comes separately but getting the whole blower used is about the same price. This unit has little rust on the center rod, so it should be in good condition.

Again, just a supposition, not a sure fix because when the resistor goes bad it's rather acts like it won't work at all or only at one speed.

http://www.ebay.com/itm/2006-Volvo-S60- ... U9&vxp=mtr

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Post by jimmy57 »

On p2's it is not a resistor like on 850's w/o auto climate. Manual or auto climate P2 both use the transistor circuit. Transistor circuit doesn't have 3 paths plus direct with a thermal fuse. What I meant by "fusing" in my reply is that the transistor internally melts and becomes conductive without a triggering signal from CCM. The afterblow functionality on P2 models could cause a full time fan run but the test for that is to unplug CCM and see if fan runs. That has been done here if I read the post correctly.

SandCastle
Posts: 11
Joined: Wed Apr 27, 2016 7:36 pm
Year and Model: 2001 v70 t5
Location: SW Middle TN

Post by SandCastle »

Hey @jimmy57 - thanks. For the transistor circuit - is that replaceable by itself? Or this the "thermistor" referenced in other posts?
I ask because I did purchase a used Climate Control Unit and that unit did not improve the issue; maybe made it worse.
You are correct - the CCU is not in the car, and the fan is continuously blowing. Which part am I looking to replace?
Thanks again, Donald.

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Post by precopster »

It is directly attached to the fan and is crescent shaped with multi pinned heatsink made of aluminium.
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SandCastle
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Joined: Wed Apr 27, 2016 7:36 pm
Year and Model: 2001 v70 t5
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Post by SandCastle »

Thanks @jimmy57 and @precopster I ordered both the fan unit and regulator - replaced these and it looks like we are back on the road! Previous posts about removing the fan - the back-right screw being impossible to get out are correct; I ended up breaking the tab off the old fan housing.
Thanks again for your suggestions.

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Post by abscate »

You can get to that hidden torx screw with a flexible driver, but sometimes the field repair manual calls for other techniques

Its fine with 4 screws.
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