coolant and cap issues

[Be2lose]

On Easter Sunday I was going up hill about 8 miles when I first got the "Low Coolant Level" alert. I looked and it had blowen out the cap. By the guage it never over heated. I went to the nearest Autozone and purchased a new cap, refilled it through the cross over cap and all was good for about 250 miles when it did it again (not uphill). I thought I just purchased a bad cap, so I bought another. replaced the cap, refilled it at the crossover tube and checked it after around 70 miles of hiway driving. All was good until today when it did it again. There is still pressure in the system, but it takes about 3/4 gallon to refill. It never heats up by the guage.

What could be causing this????

Semi sticky thermestat? and I'm just missing the temp or somthing else. I don't know.

 

[driller]

The Gen2 temp gauges are not linear like the Gen1s but I would think it should've showed any temperature increase if the temperature went up enough to cause the system to puke antifreeze.

Anytime I have experienced a sticky t-stat, the temp gauge went up. But it is a possibility.

It is possible the cooling fan is malfunctioning along with some fault in the temperature sending unit and/or gauge.

The other possibility is a head gasket leak. Depending on several factors, it could show in the exhaust, the coolant or the oil. You can also drain the oil and check for any antifreeze and check the exhaust for any signs. Any oil in the coolant reservoir? If the head gasket is suspected, you can have the coolant tested for hydrocarbons.

The last time I was at the track, one of the guys in our group would loose coolant after every run. Never on the track and never during driving on the street. He knew it was the head gasket pushing coolant at high boost.