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97 850 NA - Regular soft knocks/clicks -- repeated pattern of movement

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

xHeart
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Year and Model: 1997 854 NA
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Re: 97 850 NA - Regular soft knocks/clicks -- repeated pattern of movement

Post by xHeart » Tue May 14, 2019 2:05 pm

The intermediate arm was replaced, BUT was it installed correctly?

In preparation for summer and air conditioning, the REC switch for air recirculation is causing strange behavior. Key in POS II, REC ON (light ON) it has motor rotation and thump of vent door -- it cycles. REC OFF (light OFF) it clicks and thumps repeatedly.

The climate control is without ECC.

Install orientation is same as in this diagram #18:
Image


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Golden Retriever | 2014D VIDA DiCE | 2013A XC90 +140mi/225km | 2001 V70XC 1st Owner +190mi/ +305km | 1997 Volvo 850 NA 1st Owner +180mi/ +289km
Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

xHeart
Posts: 2424
Joined: Sat Dec 03, 2011 8:05 am
Year and Model: 1997 854 NA
Location: Great Lakes - USA
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Re: 97 850 NA - Regular soft knocks/clicks -- repeated pattern of movement

Post by xHeart » Thu May 16, 2019 11:25 am

Removing the six 25T screwed and pulling out the glovebox gives access.

I couldn't understand the motor's rotation for the REC switch ON/OFF -- it cycles with ON, and clicks with OFF. So, I decided to take off intermediate lever/arm from the motor. It disengaged the vent door opening/closing function. Left the REC switch is ON (light ON) to avoid the clicks of OFF position.

Is the vent closed when REC is ON (light ON) -- #6 flap in closed position -- recirculating cabin air? How does cabin air flows with REC switch at ON/OFF?


--
Golden Retriever | 2014D VIDA DiCE | 2013A XC90 +140mi/225km | 2001 V70XC 1st Owner +190mi/ +305km | 1997 Volvo 850 NA 1st Owner +180mi/ +289km
Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

xHeart
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Year and Model: 1997 854 NA
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Re: 97 850 NA - Regular soft knocks/clicks -- repeated pattern of movement

Post by xHeart » Tue Jun 25, 2019 9:12 am

Removed the cowl to check the flap position under the cabin filter assembly. The blower fan being visible and flap down means the ambient air is entering the cabin -- which is preferred/standard.

I'll leave the arm/lever disconnected to keep the outside air flow in to the cabin for now, but later look for ways to repair before the winter weather. ALSO keeping RECIRC switch to ON position so motor can stay quiet -- motor clicks when switch is OFF.

Why would motor turn and make clicking noise if the RECIRC switch is at OFF position?


--
Golden Retriever | 2014D VIDA DiCE | 2013A XC90 +140mi/225km | 2001 V70XC 1st Owner +190mi/ +305km | 1997 Volvo 850 NA 1st Owner +180mi/ +289km
Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

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abscate
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Re: 97 850 NA - Regular soft knocks/clicks -- repeated pattern of movement

Post by abscate » Tue Jun 25, 2019 9:35 am

OFF doesn't mean motor off, it means it is trying to return the flap to the ambient air position. I think the motor is encoded on both ECC (Electronic climate control) and MCC (Manual climate control) so if the encoder doesn't report the right position it keeps trying to position it.

Does that make sense ?


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xHeart
Posts: 2424
Joined: Sat Dec 03, 2011 8:05 am
Year and Model: 1997 854 NA
Location: Great Lakes - USA
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Re: 97 850 NA - Regular soft knocks/clicks -- repeated pattern of movement

Post by xHeart » Tue Jun 25, 2019 10:24 am

abscate wrote:
Tue Jun 25, 2019 9:35 am
OFF doesn't mean motor off, it means it is trying to return the flap to the ambient air position. I think the motor is encoded on both ECC (Electronic climate control) and MCC (Manual climate control) so if the encoder doesn't report the right position it keeps trying to position it.

Does that make sense ?
It does!
I'm able to pull the link arm #21 to move the flap to recirc position, releasing link arm returns flap to ambient air position.

It would then make sense to connect link arm #21 to lever #18 AND then hang it at motor with switch at OFF and engine OFF. BUT the square male connector at motor doesn't sync with female connector at lever -- where to reconcile.


--
Golden Retriever | 2014D VIDA DiCE | 2013A XC90 +140mi/225km | 2001 V70XC 1st Owner +190mi/ +305km | 1997 Volvo 850 NA 1st Owner +180mi/ +289km
Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

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abscate
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abscate

Re: 97 850 NA - Regular soft knocks/clicks -- repeated pattern of movement

Post by abscate » Tue Jun 25, 2019 3:17 pm

It would then make sense to connect link arm #21 to lever #18 AND then hang it at motor with switch at OFF and engine OFF. BUT the square male connector at motor doesn't sync with female connector at lever -- where to reconcile.
You have to drive it to the OFF position with engine on and make sure the motor reaches the recirc damper is OPEN


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

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