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Climate unit blower replacement

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1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
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Ozark Lee
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Climate unit blower replacement

Postby Ozark Lee » Sat Mar 14, 2009 10:03 pm

Problems with the cabin blower seem to be frequent and I am amongst those who had a screeching blower motor. If the blower isn't repaired or replaced it will ultimately take the blower resistor out on a MCC unit or the power stage on an ECC unit. The blower resistors and the power stage units are nearly as expensive as the blower so preventative maintenance can save some money in the long run.

To replace the blower you first need to remove the lower dash panel on the passenger's side of the car. It is held in place with three T-25 Torx head screws. Once the lower dash panel is removed you will be greeted with the knee bolster which has an SRS sticker on it.

DSC02572.JPG


Fear not, the knee bolster has nothing to do with the SRS and you can remove it without worry of setting of an air bag. The knee bolster is held on with three nuts. Use a deep 13mm socket and an extension to remove the nuts. You can fight it out now or you can wait until after you remove the glove box.

DSC02573.JPG


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The next step is to remove the glove box. You first need to release the retainer arms with a small screwdriver. Next to the glove box door side of each of the arms there is a small hole. Slide the screwdriver into the hole and it will release the arm.

DSC02576.JPG


After the arms are released you need to remove the 6 T-25 Torx head screws that hold the glove box into the dashboard. Once the screws are removed pull the glove box forward and then press it down on the top so that it can clear the latch brace.

If you have not yet removed the knee bolster that is the next step. It comes off easier with the glove box out since you can smack it from behind to release it from the studs.

At this point you can see the blower and its four T-25 Torx screws that hold it in place.

DSC02577.JPG


There are two screws on the left (high and low) and two screws on the right that are much nearer the center. Before removing the screws you need to remove some of the wiring harness that is anchored on the blower housing. Near the bottom there is a connector that is held in place by the blower itself. That connector needs to be removed from the blower but it doesn't need to be disconnected. There are a couple of release tabs that need to be pulled back to get it off. I am pointing to it in this picture.

DSC02579.JPG


The wiring harness that mates into the blower from above also needs to be released. It simply pulls out away from the blower. And finally the power connector for the blower itself need to be removed. On the ECC it is the connector with the blue wire and the red wire.

DSC02580.JPG


After removing the 4 mounting screws the blower slides out for removal. It will take a bit of playing with it to get around the wring harness but once clear it comes right out.

DSC02581.JPG


If you are replacing the entire assembly the replacement would simply slide back in place and - as they say - installation is the opposite of the removal. In my case I tore the blower apart and lubricated it hoping to at least postpone the inevitable replacement for a while.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC - RIP - Wrecked Parts Car.
'99 V70XC - Nautic Blue
Previous:
'96 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

Marco
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Re: Climate unit blower replacement

Postby Marco » Sat Mar 14, 2009 11:49 pm

Excellent write up Lee, thanks for taking the time to do this!
-- Marco

    Volvo wagon
    Chevy pickup

MadeInJapan
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Re: Climate unit blower replacement

Postby MadeInJapan » Sun Mar 15, 2009 12:33 am

I have a spare fan sitting in my garage (from a pick and pull for the inevitable). They all seem to go sometime.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo

opelrick
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Re: Climate unit blower replacement

Postby opelrick » Sun Mar 15, 2009 5:01 am

Lee, any pointers on taking the blower apart for lubing?

Ozark Lee
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Re: Climate unit blower replacement

Postby Ozark Lee » Sun Mar 15, 2009 11:59 am

Lee, any pointers on taking the blower apart for lubing?


You need to remove the blower motor from the mounting. It is held on with a T-15 or T-20 (off the top of my head I can't remember) Torx through a rubber grommet. After you remove the screw you need to remove the grommet and then remove the power connector. At that point the blower motor will slide out of the mounting. The rear bearing is a piece of cake, just oil it. The front bearing is a bearcat unless you remove the squirrel cage blower. I just drowned the front bearing with WD-40 and left the squirrel cage on mopping up the excess oil when I was done. I plugged the fan back in and ran it forward and backwards a few times by flipping the polarity on the power connector until the oil made its way into the bearing. I had to re-oil it a couple of times along the way and repeat the process. So far it is working but we shall see how it does in the long run.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC - RIP - Wrecked Parts Car.
'99 V70XC - Nautic Blue
Previous:
'96 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

MadeInJapan
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Year and Model: '98 S70 T5 '07S40T5
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Re: Climate unit blower replacement

Postby MadeInJapan » Sun Mar 15, 2009 12:15 pm

Just wondering if WD40 is the best oil for this? I have heard differing opinions. I know that places like Harbor Freight actually sell a electrical motor lube which I think would last longer than the WD40. Anyway, I suppose I would just use what I had sitting around.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo

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Sperry
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Year and Model: 850 Turbo 1994
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Re: Climate unit blower replacement

Postby Sperry » Thu Apr 02, 2009 9:52 pm

How about if the blower appears to blow the fuse?
Blower stops working, no flashing lights, replace fuse,
blower works, days later, blower again fails.

Is your best guess a bad blower motor shorting out?
[Yes, it was stirring up a modest racket.]
Summer is practically here. AC required!
1994 850 Turbo Sedan. 202,000, and getting more experienced, not older. - sold

Ozark Lee
MVS Moderator
Posts: 14259
Joined: Thu Sep 07, 2006 2:24 pm
Year and Model: Many Volvos
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Re: Climate unit blower replacement

Postby Ozark Lee » Thu Apr 02, 2009 10:03 pm

If it is blowing fuses my guess is that it is done.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC - RIP - Wrecked Parts Car.
'99 V70XC - Nautic Blue
Previous:
'96 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

SnookWhaler
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Joined: Fri Apr 20, 2007 1:31 pm
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Location: Treasure Coast, FL

Re: Climate unit blower replacement

Postby SnookWhaler » Fri Apr 03, 2009 1:21 am

Good write up Lee. This is becoming a more common problem as these cars age. I just did this service on my old Mercedes 300D (basically the same setup and fan). These motors will go a long time if lubed every few years.

It is easy to remove the fan from the motor assembly. Mark the top of the fan and motor shaft with paint (it is a balanced assembly). Place the bottom of the fan on a couple blocks of wood on each side. With a drift, lightly tap the shaft through the fan assy.

Lube the front bearing and blow all the dust off the windings. Assemble the fan back onto the shaft noting the previous paint marks.

Models that have the MCC... The blower resistor can be repaired for only a few bucks if you have soldering equipment. When the bearings on the fan lose there lubrication, the increased resistance in the windings and wiring will blow the "thermal fuse" on the MCC "Blower Resistor". A replacement resistor can be found at any electronics shop for a about $2 to $3. A little silver solder and you are back in business.


AJ
1994 Volvo 850 sedan 165K

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Sperry
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Year and Model: 850 Turbo 1994
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Re: Climate unit blower replacement

Postby Sperry » Fri Apr 03, 2009 10:56 am

And the location of this resister is on the blower assembly?

I'm going to open up the dash this Monday, and see if lube will bring some life back into the blower.
1994 850 Turbo Sedan. 202,000, and getting more experienced, not older. - sold


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