1. Check by intake manifold for coolant leaks.
2. Pull oil filler cap and check for brown foamy residue.
My BFF (Buick Friend Forever) says the plastic plenum melts eventually so he replaces it on every Lesabre, a cheap repair. Also the plastic intake gasket fails at around 80,000 miles so that is why to check for coolant leakage, a $700 +/- fix. Now I am finding some of the dashes fail and separate/buckle by the windshield in front of the driver. I found a nice Lesabre with a dash problem and I'm checking on how this can be fixed. Some say the dealership will do it for around $1200, yikes. But even a reasonable price of 10 hours fooling around with the dash will run $400 plus parts. This dash thing is not a happy situation. But if you can get the car cheaply enough, it may work out.
Looking at a 2001 Lesabre Limited with 103,000
4500 base
500 dash replacement
200 balance and rotate
500 two rear windows fix
200 plenum ?
500 intake gasket ?
6400
