Pretty much any time you're not doing any hard cornering of back country roads
Keep the button for the overdrive engaged at all times and the vehicle will decide when it is needed. But if you prefer to determine when to use it yourself then its best to use it when your cruising the interstate. Its basically just a 4th gear that's designed to give you better gas mileage. If your "arrow" light is lit on the dash that means that your overdrive is off. If the light is off...your overdrive is on.
There isn't one. you have to use a key.
No! The M47 is a 5 speed! The M46 a 4 speed with overdrive. It looks like you might be able to do it but their parts are in no way interchangeable. The M46 is a stronger transmission and generally outlast the rest of the car. The m47 requires attention or you might have problems at say 200K. Keep rolling!
4L60E automatic with overdrive.
Actually ALL Volvo cars were 134a starting in 1993 After 1995 all car start to use R-134
The 240 Series Volvos use standard type power steering fluid. This type fluid is available at most any auto supply store.
Dexon IID, IIE, or III. Any Dexon III is fine, and it's what I use. -Bob, 1986 Volvo 240DL wagon
Most of the Volvo 240's FM 1983 -1991 use .028.....but just call any auto parts store and they will be glad to help.........
use a drill or use the grommet that is already there.
Use the exact weight your owners manual recommends. Any major brand will work just fine.
The speedometer became electronic in model year 1986.
It's built into a fuel sending unit inside the tank, access through the floor in cargo area under the carpet. Will need a special IPD tool $24, o-ring and locking ring, old will be to corroded to use.