I just had my intake gasket changed on my 99 Monte Carlo for the same thing. My cousin is a mechanic and has changed the same gasket on several cars with the 3.1 engine. The gasket is about $60 - $75 plus labor.
video to learn how to replace the engine gasket..upper & lower gasket for 1999 Monte Carlo.
I am have the same problem with my 06 Monte Carlo LT. Took to the dealer. Its a head gasket leak.
You need to replace your intake manifold gasket. Chevy had a bad problem with these gaskets.
How to replace head gasket on 05 3.4 monte carlo
has the red coolant in a 2005 monte carlo been changed since reports on it deteriorating the head gasket?
more than likely a blown intake gasket or head gasket, check your oil to see if it looks milky colored.
One can purchase replacement parts for a Chevrolet Monte Carlo car at 1A Auto. This site offers a parts type list for one to find the replacement part needed.
Yes, there is virtually no difference in the dimensions and installation hardware of body parts between 1995-1999 Chevy Monte Carlos.
If you have it done it will be at least $1,000.
around $25.00 canadian for the part
figure on at least $1,000.