creekrat

Sounds to me like matt is on the right track! If you are getting "air pressure" in your cooling system it more than likely a head gasket or cracked head letting exhaust gas into it. Does the coolant look discolored? Does the temp rise and fall to extremes erraticly?

militarymustang88gt

nothing more than slowly climbing while idleing and when i am on the interstate it will drop to like 150

mattdel

again, replace the thermo.

then post some results.

militarymustang88gt

put a 180 in and it isnt doing any good gonna look at my heater core hoses just thought about that as i am sitting here

skielk

I'll bet its a head gasket sounds just like what my car did... it never over heated but it would force most of the coolent out of the sytem when the exhaust gas entered the system. The coolent may not discolor mine didn't but my leak wasn't that bad either. Get the 351 done or change the head gaskets before they really let go.

militarymustang88gt

yeah just need to get some money for some good heads for the 351 and then i will get it done