Daewoo front crank seal leak

Crank seal could either be at the front or rear of the engine (there are two) Cam seal is at the front of the cylinder head. If the leaks are minor, a good product that may help is lucas conditioner and sealer. Larger leaks require an actual seal replacement. No sealer will work immediately. The reason most leak is because over time the seal hardens from heat. It takes a while to soften it up again.
If the leak is from the rear main seal, the transmission needs to be removed to get to it but neither seal is part of the transmission.

Replace the valve cover gasket. On mine, the valve cover was warped and I had to get a replacement from the salvage yard to stop the leak

Heater core lines to the inside of the car or a head gasket leak. Are you sure its coolant and not condensate from the A/C?

is the oil filter loose or just need replacing,as the rubber seal is leaking shouldnt be too hard to fix twist oilfilter to see if its tight,it only needs to be as tight as you can turn it no more,but definately not loose

timming marks on cams face each other 3 and 9 o clock crank mark at about 6 o clock mark in cover and sump auto adjuster arrow should be in v mark to set this requires turning water pump by loosening water pump bolts slightly be warned some times this causes pump o ring seal to leak if turning.

Front Main Crankshaft seal leaking ---most likely ---now if it has the inspection cover on it
it can be from crank shaft --head gaskets or cam shaft seal --running down the front behind the cover
and some covers have a special oil seal in front of the cam ---this is a general answer
not the Lesabre specific --if you have the power train under warranty --I'd advise a vist to the dealer and pay the say 50buckish co pay ---but first get a closer and better look --can you remove the top or front of any of the cover ---that is not SILICONED in place --GM loves their silicone !
and see exactly where it is coming from ---if it's the front main crankshaft seal --?
Do I want to replace the front and rear seals together ?
Do I want to do the head gaskets as well --to include the intake
Do I sell the car and buy a toyota --lol ---Made you smile I Bet
Don't panic ---Identify the exact source --weigh the pro's and cons
you could try an off the shelf sealant for the oil and or a metallic or ceramic antifreeze
sealant additive too ----it WILL still need fixed but may get you around for awile --
NOTE for a leaking radiator core -if you ever put BArr's leak in a radiator to stop a radiator leak ---you Should then replace the radiator ---even if it stops the leak ---as it clogs your system and can clog your heater as well ---
Put in drive home or to a close garage then flush out the Barr's leak , replace the radiator then refill
for any parts I recommend rockauto.com ---alot cheaper than an autoparts store FOR most stuff
longest wait to my door 2 days --100%satified thus far BTW I'm a client not their friend or associate
and for used try harry'supullit.com --Hazelton pa ---best junk yard I know of and cheap --
Good Luck
HAWK

be patient they will find it

head gasket could be leaking try pressure test on radiator

Probable head gasket is leaking coolant into the cylinders