I'm driving this S70 2.0 T5 FWD for 7 years in Malaysia.
This final version of S70, a Lot of engine parts is same as S80.

I experience that gear box problem now, when driving at 2000rpm 50km/h on that time automaticaly shift up the gear it like a knock by big hammer shock and N to R when entre to reverse gear.　This problem started at radiator leakage. That time change radiator and automatic gear oil etc..
How to solve this problem, someone said change gearbox, others said transmission control unit having problem, when I sent to Volvo dealer they said US$6500 to change new gearbox. (Oh my god!)
Some mechanic said overhaul will do.
What can I do ?

2ND
This car has an auto cruising control system but my one doesn’t work!
I ask dealer service to check EDB then they said can't find out software.
Re-installation for software US$600. Again (Oh my god!)
How do I get 3rd party software?

Definately check the engine and transmission mounts. When they break, they cause symptoms exactly as you describe. The engine/transmission will move when you place the car into gear, causing a loud clunk noise.
If the tranmission shifts fine otherwise, it is not a transmission problem.

The cruise control problem could have many faults. Two to have someone look for:
A vacuum leak from a line under the battery shelf, or close to the radiator (which could have been caused when the radiator was replaced).
Or, the switch above the gas pedal is getting worn and needs to be replaced.

Nothing on your car is worth $6000US !!!

Klaus
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Please answer your responses. We need to know if the advice is good or bad. The 164 has a new home, all I am left with are 2 turbos :)

may be worth checking the hydraulic engine mtns, they can cause similar problems , and scan system for any fault codes hope this helps