I would like to make it clear that I do have a good sized collection of knowledge on Mustangs. So in answer to two of the posts, I would like to say that back in the muscle era of cars, it was quite common to run without a radiator cap. In fact, in both the owners manual, and the shop manual, it is reccommended to fill the coolant system and then run the car withOUT the cap on, this way easily allowing the air out. Also, as long as the water is being circulated by the pump, their is no need for the cap to be on, it used to be that you could leave the cap off and put a thermometer in the coolant, and it was possible to tell when the thermostat opened due to the temperature change. Further, I did mention that the engine did not overheat(the coolant that gushes out is room temperature or less), and as was already pointed out, the cap has been replaced.
To the other user who posted: I just replaced the water pump with a new one, and the problems are stilll there. The only thing left to do is pull the heads, and see if something is amiss beneath them.
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