I don't believe they had that option back in 1976.
Unless it is the Luxury edition, the seats do not fold down.
If the Impala is the same as my 2001 Monte Carlo with a 3.8 L engine, the resivoir is on the pass. side way down low in back of engine compartment. You need a bright light to see it and it is very hard to get at!
It should be right up front on the engine in back of the radiator down low towards the drivers side.
09 chevy impala rpm jumps up and down
down uner the glove box
Down same tube that holds trans dipstick.
I have never seen any of the Impala rear seats that fold down other than the stationwagon
behind the alternator near the firewall about 3" down
if it is a 3800 series 2 or 3 engine, look at back of engine near passenger side firewall...it is set down low just rear of the belt
To fold down the backseat in a 2011 Chevy Impala, locate the release levers on the top of the seatbacks. Pull the levers to unlock the seatbacks, then push them forward to fold them down. Ensure the front seats are moved forward if needed for clearance. Always check the owner’s manual for specific instructions and safety guidelines.
there are no drain plugs on gas tanks, you will have to siphon the gas out or take the tank down to get the gas out.
Turn the wipers off, pull the wiper arm off, and replace it in the correct down position.