I have a 96 Ford Mustang GT 110,000 miles. I am the original owner.
I was in Atlanta yesterday and my car started running hot. The traffic was stop and go. I noticed a puff of smoke coming from the grill of the car. I turned the heater on and took the first exit. My temperature gauge was almost red lined. Turning on the heater and getting out of stopped traffic caused the temperature to come back down to around mid way of the gauge. I drove it to the restaurant and parked it and went in and ate. When I came out, I checked the radiator and it was full. I had checked the oil before I left the house and it was maybe a quarter quart low.
----------------------------------- Back in the summer the car had overheated and I took it in to the mechanic to have it checked out. He said that he didn't find anything wrong with it but he changed the radiator cap. I drove it for a week and it didn't overhead again, but I was never in stop and go traffic. I flushed out the radiator and filled it with half and half coolant.
A few weeks after having flushed the radiator the check engine light came on. I was very near the place where I buy tires for the car. I stopped in and they put it on the computer and it said the error code was "cylinder 3". They reset the computer and told me I probably needed a tune up. I later took it back to the mechanic. He said that could mean that I had a blown head gasket. He did a pressure check and said there was no leak. He also added some stop leak and I have driven it for several months and no overhead or no engine light.