My 'stang is leaking antifreeze from under the cap of the reservoir tank. I took it to a dealership and they replaced the cap, but it has recently started to leak again. When I say leak, it bubbles out from under the cap, until the reservoir is empty. I have an appt. Monday morning, but wondered if anyone had suggestions as to what the problem is.

 

Sounds similar to what I had a week ago. I got to the office and the coolant was blowing out from the cap, no overheating noted on the gauges.

Turned out I had blown the head gaskets somehow - didn't warp the heads, just blew coolant all over the place.

 

Have them check the coolant for Carbon Monoxide .. that will tell you if it's a head gasket ...

 

I had an old cadillac with the same problem.. they replaced the cap but it keptbubbling overso it turned out to be the head gasket which was kinda pricey if I remember right