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Climate control fan problem, intermittent air flow

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40

ripfan
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Year and Model: 2001 V40
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ripfan

Climate control fan problem, intermittent air flow

Post by ripfan » Wed Nov 02, 2016 3:09 pm

2001 V40 1.9T, automatic

Sometime, too often, the climate control fan runs fine, then has a burst at max before completely stopping airflow into the cabin. Some of the lights on the dash also don't light-up, although I'm not sure if that's a related issue. Either way, this doesn't seem like a unique problem. From what I have read, the cheapest first possible cause to tackle is the climate control transistor.

http://canada.newark.com/multicomp/2n30 ... dp/35C0700

Is my diagnosis feasible, and is that what I should order? Thanks for helping out.

wahiddd
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Year and Model: 2001 S40 2.0T
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wahiddd

Re: Climate control fan problem, intermittent air flow

Post by wahiddd » Sun Jan 01, 2017 4:28 am

You can try replace your blower variable resistor/trim pot in your climate control module
Inside the faulty trim pot, resistor skid is worn out due to slider movement

I already did mine2 years ago. cant remember exact part no.
Piher brand PT-15 POTS with "N" rotors, 5K resistance, Horizontal Mount - Vertical Adjust

The parts is cheap. But here, quite difficult to find PT15 trim pot with "N" rotors.
Ended up dismantle new and faulty trim pot, than using old rotor with new PT15 carbon resistive.
Attachments
Piher PT15.jpg
Piher PT15.jpg (15.02 KiB) Viewed 763 times

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alschnertz
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alschnertz

Re: Climate control fan problem, intermittent air flow

Post by alschnertz » Sun Jan 01, 2017 10:24 am

I changed the transistor in my '01 S40 hoping to cure the surging blower fan. I had a post about it but can't find it.
It didn't make any difference. It's pretty annoying.

I'd be willing to try the rheostat that wahiddd recommends next.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

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