Antifreeze leaking from overflow tank

I live in Tucson, Arizona and today after work I cranked my '97 Dodge
Grand Caravan and sat in the car with my wife for over an hour.
During this time I had the car running with the airconditioning on.
Someone walked by and told me that antifreeze was leaking from my car.
I checked the temperature and it was in normal range. I popped the
hood and could not find a leak, but saw that my overflow tank was
almost overflowing. It was above the maximum amount. I also saw that
there was some power steering fluid on top of the power steering fluid
reservoir. The engine seemed really hot, even the hood prop was too
hot to handle. Can anyone tell me what would cause this? After I let
the car cool down for a while, the antifreeze in the overflow tank
went back down to minimum. The van drove home fine without any
problems. I should say that I think the 02 sensor is bad and the car
seems to run lean. Any help would be great. Thanks!!!

 

Are you sure that it was antifreeze on the ground and not just ac
condensation which is normal?
Sounds like your steering fluid might be over filled. Instructions on
checking the level are in your owners manual.

 

Maybe not enough airflow around the engine compartment. When the car
moves all that surrounding sheet metal, hood fittings, latches, etc,
stay cooler. I believe any vehicle that sits in one place for a long
time with the AC on in hot weather is going to build up heat in the
front of the car....,
Bob

 

Yeah....I thought about the airflow, but I have a 2003 vehicle and it
has never done anything of that sort. The van runs fine (other than
the 02 sensor). I just found it odd because I thought antifreeze was
not supposed to expand and yet it rose out of the overflow tank.
Thanks for your guys' help. I will be doing some more investigation
and post my results later.

Gabe

 

If it wasn't supposed to expand, why is there an over flow tank!