Climate unit blower replacement

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
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
1997 - 2004 C70
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Sperry
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Joined: Fri Nov 10, 2006 6:57 am
Year and Model: 850 Turbo 1994
Location: Mid-Atlantic region

Re: Climate unit blower replacement

Postby Sperry » Mon Apr 06, 2009 10:41 pm

Thanks for the resistor photo, Lee. It makes more sense when the dash is opened up.

I got the blower out. Boy, what a mess the windings and blower cage have become.
Now I know why people like to use new components. Salvaged parts might have the same problem.

Still, I'm going to install a pulled part. If the blower resistor is faulty,
I'll fix it [one might be included with the blower].

This link to a schematic also shows the resister location.

Image
1994 850 Turbo Sedan. 202,000, and getting more experienced, not older. - sold

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Sperry
Posts: 236
Joined: Fri Nov 10, 2006 6:57 am
Year and Model: 850 Turbo 1994
Location: Mid-Atlantic region

Re: Climate unit blower replacement

Postby Sperry » Sat Apr 11, 2009 7:23 pm

The upshot on my blown blower fuse is that I swapped out the 30A fuse with the power antenna fuse, and have been enjoying audio books on CD without the antenna raising and lowering. I'm thinking about a dash-mount toggle [factory, of course] for the antenna.

Cleaning the blade connectors and a lube brought my blower back for a few days, but it is back to intermittent. Fortunately, the salvaged is here [$37, and looks good].

I couldn't find the blower resister on myswedishparts.com

Can anyone shed light on this?
1994 850 Turbo Sedan. 202,000, and getting more experienced, not older. - sold

Ozark Lee
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Re: Climate unit blower replacement

Postby Ozark Lee » Sun Apr 12, 2009 12:03 am

The part number I come up with is 9144354 for the power stage (ECC blower resistor) but they normally aren't intermittent. They either don't work at all or the blower runs constantly when the power stage fails.

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

charliefoxtrot
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Year and Model: '97 850
Location: Atlanta

Re: Climate unit blower replacement

Postby charliefoxtrot » Thu May 07, 2009 12:18 am

Again, very nice write up!
I removed the blower motor to remove debris that got into the plenum. After cleaning out the stuff, I reinstalled the unit and reconnected the electrical. The fan immediately began running at high speed. The ignition was switched off and the fan control was off.
Do I need to reset a relay or did I screw something up?

Ozark Lee
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Re: Climate unit blower replacement

Postby Ozark Lee » Fri May 08, 2009 10:55 am

The fan immediately began running at high speed. The ignition was switched off and the fan control was off.


When they run constantly it normally means that the power stage (blower resistor) has shorted out. For some reason the power to the blower is not switched with the key.

...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

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Sperry
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Joined: Fri Nov 10, 2006 6:57 am
Year and Model: 850 Turbo 1994
Location: Mid-Atlantic region

Re: Climate unit blower replacement

Postby Sperry » Fri May 08, 2009 11:28 am

My experience was odd.

Blower fuse failed, replaced fuse.
Fine for days, then intermittent function.
Replaced blower w/ salvage unit.
Fine for days, then intermittent function. Code 411, 418 [I think it was].
Replace power stage with new unit.
Fine for days, then intermittent function. One last failure.
Pulled ECC, unplugged and plugged in wires.
Everything fine since. Knock wood, but it's been weeks.

I can ship you my old power stage for a nominal fee; however, although it never fully failed as described by Lee, the resisters show evidence of "leaking and oozing", and intermittent function is strongly suspected.

Even though my car has 160K miles on it, if I was doing it again, I'd buy a new blower and new power stage from Darrell Waltrip. Just like I should have bought a new radiator fan last year, but put in a salvaged part, ad did the same last week [after enduring driving with the windows down and the heater on, and scrambling for a replacement fan].

If JRL's upcoming '97 850 T5 had appeared three weeks ago, I might have jumped.
However, at this point, I'm committed for another year or three.
1994 850 Turbo Sedan. 202,000, and getting more experienced, not older. - sold

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tailor
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Re: Climate unit blower replacement

Postby tailor » Sat May 23, 2009 10:19 pm

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.


If this is true and I believe it to be so, how then can an existing cage be attached to a new motor and the balance maintained or be determined?
1994 850 Auto Turbo wagon 306000km (Sold)
2004 XC90 AWD 188000km

"Life is like a reel to reel tape recorder,
the closer you get to the end,
the faster it spins."
Abe Gottschalk

MadeInJapan
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Re: Climate unit blower replacement

Postby MadeInJapan » Sat May 23, 2009 11:02 pm

As long as the blades aren't messed up or bent, the way the motor fits in the cage will automatically assure balancing. I've not changed the cage myself but have friends who have and it works fine- I just thought the trade off of savings just wasn't worth the hassle.
'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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tailor
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Re: Climate unit blower replacement

Postby tailor » Sun May 24, 2009 5:23 am

Thanks for the input MIJ

I was giving the balancing issue a little more thought, and came to the conclusion that it must be a similar type of thing to wheel balancing. Most wheel balancing is done with the wheel off the car.I guess a similar approach is for the cage. So the orientation of cage to shaft is of no consequence.
1994 850 Auto Turbo wagon 306000km (Sold)
2004 XC90 AWD 188000km

"Life is like a reel to reel tape recorder,
the closer you get to the end,
the faster it spins."
Abe Gottschalk

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Sperry
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Joined: Fri Nov 10, 2006 6:57 am
Year and Model: 850 Turbo 1994
Location: Mid-Atlantic region

Re: Climate unit blower replacement

Postby Sperry » Sun May 24, 2009 9:44 am

The cage uses a clip to add weight at a particular side.
1994 850 Turbo Sedan. 202,000, and getting more experienced, not older. - sold


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