white smoke after warming up

[Robotech]

I have a GSX i bought a year ago, and was looking at another GST yesterday and both have the same issue. When you start them up, they are fine. Engines run great, purrs like a kitten. However, after about 2 minutes or running, white smoke start to come out. Hit the gas and a big cloud of white smoke pours out.

Now my thinking is that this is antifreeze, but I'm trying to understand where it could be from. I am assuming that after running for a few minutes, the thermostat opens on the coolant and then the water pump is pumping coolant through the engine at that point, hence the time it takes to start. At least I assume this is correct?

As far as the GST I was looking at yesterday guy claims it had never done that before. But the car was in an accident where the rear quarter got hit and the rear tire was really messed up. Then the car sat for a year. The question is, could an accident involving the rear end have hurt the engine some how? car has 134k miles on it and I must say its one of the cleanest unmolested GSTs i've ever seen. Body is fantastic except where it got hit, and no engine mods at all.

I'm assuming its a head gasket most likely? Is there any way to test for that?

I seek thy wisdom oh great DSM gods

 

[TravisB]

Perform a compression test to see if there is a leak in the cylinders.

 

[Robotech]

Perform a compression test to see if there is a leak in the cylinders.

If it was a head gasket would all of the cyclinders show low compression or just one? Or it will it depend on how the head gasket was breached?

 

[Tiki2777]

If it was a head gasket would all of the cyclinders show low compression or just one? Or it will it depend on how the head gasket was breached?

Depends, some people get a tiny pinhole leak on one cylinder, and others have blown through all four cylinders and even hydrolocked.
Do the standard steps to test a head gasket, compression, gas tester tool for combustion in your coolant system, milky oil or mixing of either fluids.

 

[TravisB]

If it was a head gasket would all of the cyclinders show low compression or just one? Or it will it depend on how the head gasket was breached?

It will tell you which cylinder is breached based on how much pressure it pumps up.