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It's a sealed transmission. You'll have to take it to a Volvo dealership.
I found that a mechanic that used non Volvo transmission fluid caused this problem in my 2002. Once it was replaced with genuine Volvo transmission fluid it stopped surging.
its in the bottom hose
its in the bottom hose
Approx 5 quarts
7 quarts if just a fluid change.
I believe this car has a sealed transmission and so the fluid cannot be changed.
The 2002 Volvo S80 has a 4-speed automatic.
The 2002 Volvo C70 has a 5-speed manual.
The 2002 Volvo S60 has a 5-speed manual.
There is NO drain plug! To change fluid you have to remove the transmission pan.
I do it at about 50K miles.