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.
that the seal around the pan is comprimised or the transmission seal is comprimised and either one has to be replaced
Aeration.
The transmission fluid on a Volvo 850 is added to the filler tube. This is accessed by removing the dipstick and inserting a funnel.
It's a sealed transmission. You'll have to take it to a Volvo dealership.
Volvo says that their automatic transmission has a lifetime fluid that does not need to be changed. On the other hand, most experts recommend replacing the transmission fluid every 30,000 miles to extend transmission life and prevent premature transmission failure.
Volvo tries to charge and arm and a leg and a pinky for their Volvo Transmission Fluid. The fluid is the same as Mobile 3309 transmission fluid. You can also use Toyota's T4 fluid as well. Both cost a FRACTION of the cost of what Volvo charges. And on top of this, I spoke with a transmission place, and they told me that a standard $80 fluid change is all that's needed and that you don't even need any "special" transmission fluid. This latter point is on you to decide. Speak with a transmission specialist and also research with Google about the Mobile 3309, you'll see.
The transmission fluid is inside of your transmission if you are looking for the dip stick in Volvo its underthe hood hiding next to the block twords the back of the vehicles
What is generally the least expensive but acceptable transmission fluid(gear box) for a 2001Volvo s40T3
To add automatic transmission fluid to a 1997 Volvo v70, one must simply find the reservoir for transmission fluid and pour the fluid in the top. To locate the reservoir, one can consult the owners' manual.
The transmission on the s60 has no serviceable filter. What is recommended is to flush the transmission fluid using a good grade synthetic fluid such as Castrol Syngard.
It's the fluid inside the transmission that lubricates the gears and allows the transmission to function properly. It should be replaced with Diamond SPT III transmission fluid.