Intake manifold gasket
Either a blown head gasket or a cracked block possibly
The head gasket on a 1999 Chevy Malibu is replaced by removing the coolant, intake manifold, and retaining bolts. The cylinder head can then be removed, the gasket replaced, and everything reassembled.
Find the source and repair it.
if you have a leaking water pump gasket i thing bay a new one is better
take it to a pro
They only Head Gasket I had to replace was on a Chevy Malibu 1999. Cost me about $1400
If you are sure that it did not freeze and crack the block, Then the intake manifold gasket is leaking. That is a common problem with the vortec Chevy engines. You need to replace the gasket with a factory Chevy gasket from the dealer.
You either need a head gasket or intake gasket.
NO NO, That would be a intake gasket leaking, not a head gasket. You also should check where the heater hose hooks up on the intake, it may be leaking.
Drain the oil from your 2003 Chevy Malibu oil pan. Remove the oil pan retaining bolts. Remove the oil pan gasket. Put a new gasket on the new oil pan and reverse the process.
bad head gasket
Sounds like head gasket is leaking