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C70 convertible roof, how does it work?Views : 3773 Replies : 17Users Viewing This Thread : |
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Jun 2nd, 2023, 02:32 | #1 |
C70 and v70 owner
Last Online: Jun 10th, 2023 04:38
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Location: Leicester
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C70 convertible roof, how does it work?
I am currently touring the usa in a good looking 2004 C70. Except for 2 inches of duck tape filling the gap between the rear roof panel and the boot lid. On closing the roof the two rear tensioner got captured beneath the parcel shelf but didn't tension down the roof. Now if you press the roof up button it just jiggles about. If you press the roof down button it just jiggles about. Any suggestions how I get it out of this pickle? These are magic till they no longer function! Joined the forum because every volvo agent in west usa has a two month wait time. |
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Jun 2nd, 2023, 07:27 | #2 |
VOC Member
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Location: Northampton
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I suspect the microswitches that operate the rear cover have broken. However, your best bet is to get on Facebook and search for Volvo C70 mark one roof problems and fixes. Paul Mountain is the chap who can advise and will talk you through what the problem is and how to resolve. Although Paul is UK based, he helps folks worldwide.
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2001 V40 2.0lt Sport Lux - Daily Driver. 178k miles. 2003 C70 2.4 GT Convertible - Garage Queen. 67k miles. http://www.neptuno6benagil.com Last edited by ITSv40; Jun 2nd, 2023 at 07:54. |
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Jun 2nd, 2023, 08:56 | #3 |
Bungling Amateur
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Location: Beverley, East Yorks
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The roof is actually a very simple construction with 4 motors (rear latches, deck cover latch, main roof, front latches) and a similar number of microswitches and potentiometers (position sensors).
There is roof ECU which is a simple logic system, and there is a 7 (I think) step sequence to opening and closing the roof. In 99% of cases, the problem is a switch, broken wire, or potentiometer that has become dislodged or broken, and the system cannot tell if one of the steps has completed or doesn't get a consistent/expected state. Unfortunately, given the last of these cars were made 18 years ago, there are very few Volvo dealers with any mechanics that know anything about them, and although any fault codes from the roof ECU and sensor values can be read and cleared by VIDA, to test actuations and program new components in, VIDA's predecessor (VST2000) is required and they are near non-existent today. Hence they best way forward is to find an independent chap - and Paul Mountain is one such person - highly regarded on forums - but he does it as a hobby I think. Anyhow back to your roof - you can manually close it if you can find the manual roof tools - there should be a cranked allen/Torx key and a T-bar tool. - Open the boot and locate the two holes in the rear bulkhead to insert the tools, you need to lift up a flap of boot lining carpet to do that - Insert the T-bar tool (widest leg) into right hand hole and turn anti-clockwise* as far as you can - you will hear a few clicks and clunks - this operates a gearbox so you can manually operate the roof, disconnecting one of the motors. You then turn it back just one click. - Insert the torx end of the cranked handle into the left hand hole and turn clockwise whilst pushing down hard on the middle of the tension bow - this should draw the roof seal down onto the top of the deck and complete the closing cycle. You will need to experiment - by very gentle - *I may have got my clockwise/anti-clockwise directions mixed up as it has been a few months since I have done this. First task is finding the tools, usually they are in the pocket of the boot, spare wheel well or glovebox, sometimes in a tool wallet. EDIT: Just found this - it may help : https://volvoforums.com/forum/volvo-...en-roof-69965/
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2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1976 Massey Ferguson 135 Last edited by Tannaton; Jun 2nd, 2023 at 09:01. |
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Jun 11th, 2023, 15:09 | #4 |
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Last Online: May 21st, 2024 22:05
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Did you get it fixed? I have fixed three different problems on mine, and have amassed a lot of resources and experience in the process. I've got wiring diagrams, sequence diagrams etc if you need anything and any more advice.
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Current: MY24 Vapour Grey B5 XC90, 2004 C70 T5 Collection (manual), 1993 940 estate. Previously: 2006 S80 V8 Sport, 1998 V70 2.5 20v XLT, 2008 V50 T5 R-Design. |
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Jun 11th, 2023, 15:17 | #5 |
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I would quite like to import a reconditioned VST from the US and do some sort of shared ownership between UK C70 owners one here.
I've always managed to do what I've needed with just VIDA and a multimeter so far, but I hate the risk that some day I am going to need a VST and going to be stuck. Even if you can find a dealership that still has one they often seem to be broken or incomplete. A member on here sent me the complete set of K-line codes for everything VST does with the roof controller. So it would be a really interesting project to make something home brew that could replace VST for roof controller duties, using something like https://github.com/handmade0octopus/ds2
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Current: MY24 Vapour Grey B5 XC90, 2004 C70 T5 Collection (manual), 1993 940 estate. Previously: 2006 S80 V8 Sport, 1998 V70 2.5 20v XLT, 2008 V50 T5 R-Design. Last edited by NickP; Jun 11th, 2023 at 15:20. |
Jun 12th, 2023, 07:22 | #6 | |
Bungling Amateur
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Location: Beverley, East Yorks
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Quote:
Currently mine is not working again, I’m suspecting the rear latch microswitch(es) going to have a look later after having to spend the hottest weekend so far under cover :-(
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2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1976 Massey Ferguson 135 |
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Jun 12th, 2023, 13:51 | #7 |
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If you've not got VIDA, you're very welcome to bring it over some to mine in Sheffield. Funnily enough I had to fix one of my microswitches yesterday. It had physically sheared off I think when I was hurriedly manually operating the roof. Was able to glue it back together. It's so nice to have the top down again and no infernal dinging noise.
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Current: MY24 Vapour Grey B5 XC90, 2004 C70 T5 Collection (manual), 1993 940 estate. Previously: 2006 S80 V8 Sport, 1998 V70 2.5 20v XLT, 2008 V50 T5 R-Design. Last edited by NickP; Jun 12th, 2023 at 13:53. |
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Jun 12th, 2023, 16:49 | #8 |
The Brit Brick
Last Online: Aug 13th, 2023 09:39
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Forgive my ignorance team, what's a VST?
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2005 C70 2.4T Collection convertible. 40,000 mile sunny day toy. |
Jun 12th, 2023, 17:05 | #9 |
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It's an old dealership handheld diagnostic device from the 90s.
Its replacement VIDA (software) and DICE (the hardware interface VIDA works with) can do most things on a mk1 C70 including reading many of the values from the roof controller. However, there are some things that only VST can do. Below is VIDA and on the left are the values it can read from the roof controller: You can see all the additional mk1 C70 roof capabilities of VST here: https://www.volvoforums.org.uk/attac...9&d=1620575256
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Current: MY24 Vapour Grey B5 XC90, 2004 C70 T5 Collection (manual), 1993 940 estate. Previously: 2006 S80 V8 Sport, 1998 V70 2.5 20v XLT, 2008 V50 T5 R-Design. Last edited by NickP; Jun 12th, 2023 at 17:17. |
Jun 13th, 2023, 14:26 | #10 | |
Bungling Amateur
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Quote:
I'll keep this thread posted at to my diagnosis, I wasn't bothering as I didn't think too many people were interested but it's good to speak with someone "in the know"....
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2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1976 Massey Ferguson 135 |
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c70, convertible, repair, roof, stuck |
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