What could be wrong when a 1999 Monte Carlo overheats and loses coolant?

Asked by Mar 01, 2013 at 10:31 PM about the 1999 Chevrolet Monte Carlo

Question type: Maintenance & Repair

6 Answers


My first guess is the intake manifold gasket. The best bet is to pressure test the system and see where the leak is/.

1 of 1 people found this helpful.

so where's the coolant going? down and out the tailpipe? in a pool under the waterpump, towards the transmission? not visibly anywhere, but simply dissapears with use?

2 of 2 people found this helpful.

One common cause of overheating and coolant loss is a bad coolant bottle cap. If it doesn't seal, it takes a lower temperature to boil the coolant. Tightening too hard or too often can damage the gasket and/or warp the bottle. --- check it out before spending a lot of time and money on tests.

1 of 1 people found this helpful.

If your not seeing a pool or it leaking, as already mentioned its possibly the gasket or a cracked head (as already mentioned) or even a bad cylinder wall. My car had the same dilemma, it was actually a cracked block, decided not to bother fixing it and just sold it off as is.

1 of 1 people found this helpful.

and RandyS is where now?...busy thumbin' it-


If it's the 3.8L V6 it's most likely the upper plenum and lower intake gaskets. If it's the 3.1L its most likely the head gasket. HTH. -Jim

1 of 1 people found this helpful.

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