txcl, my 79 has done me justice, but I have had it garaged always.

I'd check the axle shaft covers for cracks/leaks.

It may not start because it does not have correct valve clearance adjustment.

The loop type glow plugs' relay costs about $250 new.

might be time for new injectors anyway... mine needed replacement around that milage (135K to 150K).

plugged up fuel filters? algae in tank?

Hope the ignition tumbler and associated steering lock is smooth.

make sure trans is OK. (mine OE went out at around 125K miles)

other than that, the klima thing ought to be bypassed. Don't waste money on it, although that might disable your A/C.

The window sounds like a dirty window switch or loose glass from metal frame.(glue it back on or replace window).

right on about checking for mice if the car has been parked outdoor forever !

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD