My Z24 has developed a coolant leak. It has the 2.4 liter engine in it and sat outside not being used for 2 years until a couple months ago. My daughter has started driving it on a daily basis now. I checked the oil and it is clear. When driving sometimes the heat will stop working and then start working again. It also starts making a gurgling sound from the coolant bottle on the radiator after driving it at highway speeds. It also runs a little warm @ high speeds, slow down to 55 and cools down to what it is supposed to run at. Has anyone seen a problem like this or have any ideas?

The intermittant heat is due to the coolant leak. Have the vehicle pressure tested to find out where the antifreeze is going.