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V70 Fan Intermittent

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

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Roger_850T
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V70 Fan Intermittent

Post by Roger_850T » Fri Aug 09, 2019 8:36 pm

I'm having trouble with the climate fan in my 2002 V70. It's intermittent. Sometimes it blows in pulses. wooh, wooh, wooh, maybe about 1-2 Hz. When the car is really hot, when it's been parked outside and baked in the sun, (interior well over 100F,) then it doesn't blow at all. (Most inconvenient, the blower fan dies when you need the AC the most!) The blower fan varies when the setpoint is manual, set to a constant speed. The fan doesn't make any noise, and seems to run quite properly when thing are cool.

Any suggestions on the problem? The motor seems fine. The controller (even when in manual, at a fixed setpoint) is ignored. Any suggestions on how to troubleshoot and confirm vs. just randomly replacing parts?

Thanks for the suggestions!

Roger


'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...

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oragex
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Re: V70 Fan Intermittent

Post by oragex » Fri Aug 09, 2019 8:41 pm

What do you mean by ignored controller ? The other thing to look at is the cabin temp sensor



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Roger_850T
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Re: V70 Fan Intermittent

Post by Roger_850T » Sat Aug 10, 2019 12:25 pm

oragex wrote:
Fri Aug 09, 2019 8:41 pm
What do you mean by ignored controller ?
By that I mean I can set the manual fan control somewhere (middle, max, off, anywhere in between) and the LED's around the knob light up in the corresponding position (middle, max, off, in-between), but the fan does not change at all.

When the fan chooses to run, it sounds great. (No grinding or ugly bearing noises - sounds like a properly running fan.) And when it's working properly, then adjusting the manual control knob makes the fan speed up and slow down accordingly. But when it's misbehaving, it blows in pulses, "wuh wuh wuh" or doesn't run at all. When it's pulsing, it still sounds good, (no other unusual noises then, either,) just gives erratic airflow.

Roger


'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...

User avatar
Roger_850T
MVS Moderator
Posts: 250
Joined: Tue Dec 31, 2013 11:55 am
Year and Model: 854T 1995
Location: Frederick MD
Has thanked: 0
Been thanked: 10 times
United States of America
Roger_850T

Re: V70 Fan Intermittent

Post by Roger_850T » Sat Aug 10, 2019 12:30 pm

Also, when the fan is not running, if I turn the manual knob, I see the green light for the A/C turn amber when the fan knob is at zero, then green when the fan is supposed to be turning. I have not been successful in inducing airflow by driving with the windows cracked open, so I don't even get any cooling at that point.

The worst is when the wife parks it in a sunny parking lot while she's shopping, then the A/C doesn't work when she gets back in the car. I really feel the heat on that one... ;)

Roger


'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...

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