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Testing cabin temp sensor fan motor

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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jreed
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Re: Testing cabin temp sensor fan motor

Post by jreed »

I'm not sure if this will apply in your situation, but on my Ohmmeter, when the range setting is lower than the value of the resistance I'm trying to measure, the meter also shows "1" for overload. To get a reading, I increase the range setting (for example, from 200 Ohm range to 1k Ohm or 10k Ohm or higher) until I get a reading. If you're getting "1" on all range settings, then the component may be an open. You have probably already done this, but if not you can verify the meter is OK by touching the probes together to make sure it shows close to zero, and by measuring a known resistance.
1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94
scot850
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Re: Testing cabin temp sensor fan motor

Post by scot850 »

Thanks, I'll try that and post back.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold
scot850
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Re: Testing cabin temp sensor fan motor

Post by scot850 »

Rookie mistake. I thought I had tested resistance on all settings but had to set it to 200k setting to get readings. Then couldn't initially figure out why the readings were all over the place. Then had the 'D'oh' moment, when it finally dawned on me I had brought the sensors in from the (colder) garage to the house, so strangely the sensors were re-calibrating to the higher temp. I've left then for now to acclimatise to the house temp and then test again for consistency of resistance at the same temp to find a working range (hopefully). Then I can try testing at different temps to possibly help an 'in-field' base to test at a junkyard with a basic electrical meter.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold
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abscate
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Re: Testing cabin temp sensor fan motor

Post by abscate »

This is for the bastard 1999 - cabin temp sensor in dash.
Screen Shot 2017-10-23 at 11.45.04 AM.png
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scot850
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Re: Testing cabin temp sensor fan motor

Post by scot850 »

Thanks abscate.

At 23C (approx. 73F) All of the cabin temp sensors read between 10.4 and 10.5K ohms, so allowing for inaccuracies of my room thermometers and the cheap meter I'd say they all tested out fine. Not bad, all 9 are in spec and have working fans with similar resistances. So we now have a basic method for field testing and need a simple thermometer to get an ambient temperature.

I'll write up a simple test method later.

Now need to finish testing the remaining 4 fan motors and 2 ECC units.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold
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abscate
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Re: Testing cabin temp sensor fan motor

Post by abscate »

We expect to see that -40F data from you shortly...Brrrrrrrr
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
scot850
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Re: Testing cabin temp sensor fan motor

Post by scot850 »

Funnily enough I CAN wait for that temperature hitting us!

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold
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BEJinFbk
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Re: Testing cabin temp sensor fan motor

Post by BEJinFbk »

I really hope I don't beat you to it...
'98 V70 R - Well Equipped for Life Up North... ;)
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