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The PS fluid is ATF, so you do need to find the leak and monitor it. My 1998 V70 was weeping at the rack when I bought it, but I learned to not turn the steering wheel to the max and hold it there (lots of pressure at that point). I never had to add ATF to the PS.
To check crankcase pressure, warm up the engine and then with the engine off remove the filler cap and wrap a used latex glove over the hole. I used a rubber band to keep it in place. After starting the engine, if the glove does not inflate, you are golden. Remember to have the engine off if there is no glove or cap in place, the cam will sling oil everywhere!
All turbos have oil cooler lines on the passenger side and due to age, they will eventually leak at the metal to flex fittings. These hoses are not cheap and some folks get them repaired at local hydraulic shops for a lot less money, but that means being without the car for those days.
The top transmission cooler line that goes to the radiator (driver's side) is the exit end from the pump. If you do a flush, this is the line that comes off the radiator so you can direct the ATF to a gallon jug. Get a new clamp and O ring from the dealer (cheap).
Draining antifreeze is easy, but the petcock on the bottom of the radiator is plastic and does not like to be tightened very much so be careful it doesn't break. Always use quality antifreeze, not the junk that the red blocks can use.
Never get an aftermarket thermostat. The factory OEM type tend to fail in the open position, which is good. Many aftermarket designs fail in the closed position and the engine overheats, causing a disaster.
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My back feels better when I sit in a Volvo seat
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