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Door Locking Issues

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

thejrh
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Year and Model: 1999 v70
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thejrh

Door Locking Issues

Post by thejrh » Tue Apr 28, 2020 11:49 am

Hello,

I've had 1999 V70 XC for the past 7 years. When I bought the car the former owner let me know that the key wouldn't unlock the doors manually and only the fob would lock and unlock the doors. The only lock that the key works with is the hatchback.

Last summer when it was hot (I live in Charleston SC, so it gets nice and hot) the locks sporadically stopped unlocking, especially when it was in the direct sunlight. Once it cooled down the problem stopped.

Now that we are in spring and it's warming up the issue has started again and seems to be worse. If the car is in the sun or it's warmer the locks do not unlock.

All I really need is a key that will work on the door lock. Suggestions?

Appreciate it.
Rob

crlande
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crlande

Re: Door Locking Issues

Post by crlande » Tue Apr 28, 2020 2:39 pm

The thermo switch in lock actuator. Do the search on this site.
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thejrh

scot850
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Joined: Mon Apr 05, 2010 2:46 pm
Year and Model: 2000 V70 R
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scot850

Re: Door Locking Issues

Post by scot850 » Tue Apr 28, 2020 3:31 pm

Each door lock actuator has a thermal overload fuse in it. As they age they start to break down and will overload at a lower load level. When it gets hot outside, the overload switch will kick in under nearly no load.

I think there may be a tutorial on how to get a work around, or only other option is new door locks on the offending doors.

Are you sure someone has not replaced the door handle at some point and it has the wrong lock assembly in it?

The headlight washers also have a similar issue which can be fixed by disassembling the motors and replacing the resistor with a piece of wire, but the risk is if you get the wipers frozen in the winter you will blow the main fuse which takes out the windshield wipers as well. I think there was also a tutorial for that with an updated resistor soldered in. Otherwise solder in an in-line fuse for each wiper at a lower value than the main wiper fuse.

Good Luck. (that reminds me both my rear doors on my 'R' do that and won't open when hot).

Neil.
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thejrh
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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rspi
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rspi

Re: Door Locking Issues

Post by rspi » Thu Apr 30, 2020 9:04 am

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scot850
'95 855 T-5R M, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red 25/32 mpg
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos

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rspi
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rspi

Re: Door Locking Issues

Post by rspi » Thu Apr 30, 2020 9:05 am

'95 855 T-5R M, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red 25/32 mpg
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos

scot850
Posts: 6184
Joined: Mon Apr 05, 2010 2:46 pm
Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
Has thanked: 18 times
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scot850

Re: Door Locking Issues

Post by scot850 » Thu Apr 30, 2020 11:05 am

As always Robert your videos are great to have access to. 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
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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