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I think we should get some facts straight here:
1, No Volvo has ever been fitted from factory with vacuum operated central locking. Anyone who says they have is wrong. Vacuum operated central locking does not work and was only tried on a few cheap cars. I know Saab never used them and I very much doubt Mercedes did.
2, In order for a remote central locking system to work, you do not need your lock barrels to work. It is in fact common in Sweden to remove them all together and just have a remote central locking setup. However, I would not recoomend this as what do you do if the remote system brakes down? Because it will!
3, On the 700 series, Volvo used four motors and one actuator, on the 900 series they used five motors, the driver door one having a built in actuator. Thus, if you have a 700 series and you wish to install a remote central locking system, you need to add a motor to the driver door. To use a Volvo motor is a good idea as it will fit better but it can be from a 700 or a 900 series. This motor will lock and unlock the driver door via the locking rod in the door and thus causing the actuator to lock and unlock the other doors.
If you need any help or further information, e-mail me, I have done this many times on both Saabs and Volvos.
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George Holmer, Belgium, Europe, 1987 745 GLE Turbo Diesel Intercooler (D24TIC/M46) 200k; 1988 745 Turbo Intercooler (B230FT/M46) 290k; 1988 745 GL (B200E/M47) 190k
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