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P80 wiper motor protection - How?

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.

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scot850
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Re: P80 wiper motor protection - How?

Post by scot850 »

Those look interesting. I think even I could wire one of those up!

Thanks,

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
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abscate
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Re: P80 wiper motor protection - How?

Post by abscate »

Pretty cool inside
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taxi
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Re: P80 wiper motor protection - How?

Post by taxi »

Does anybody happen to have a picture of the thermo protective thingy? My motors move a little at a time, despite freeing the big nylon wheel inside, and I suspect these resistors may have something to do with it.

And thanks to this thread I can now put separate smaller fuses on the motors, I would never have had this idea! (I disconnected both motors when one started the "one step at a time thing")

Thank you!
scot850
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Re: P80 wiper motor protection - How?

Post by scot850 »

If you look at the last photo abscate posted, just under the motor, there are 2 parallel copper strips. Pushed between the 2 strips is a square piece of shiny metal which is pushed in at a 45 degree angle. This is the thermo-resistor. This is usually what fails. But sometimes if you are lucky, stripping the whole unit down, cleaning all the old grease out and re-greasing with high temp. grease can help. Most importantly, remove the shaft for the wiper arm and clean the hole out thoroughly and use some light oil on the shaft when refitting. Make sure the shaft moves easily.

The motor brushes can also get dirty with age. There is a SAAB 9000 website that does a full how-to on this re-build, including opening the motor up and cleaning and lubing it.

I have not found a source of replacement resistors, although some have found other resistors that work the same way and have soldered them between the 2 copper contacts. If you are not concerned about breaking the motors, then you can use a piece of copper wire forced between the 2 contacts. This was the reason for this thread originally.

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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