A container of dex-cool being stored in the truck has a loose cap or a hole in the container.
you got an antifreeze leak
no it could be clogged what type of vehicle is it? does it use dexcool?
The propane will leak out
Yes, a vacuum leak will be detrimental to fuel mileage.
maybe its automatic transmission fluid
been there done that, i had an 01 , 3.1 same situation, its the upper and lower intake gaskets, its a common problem with these gm models, its blamed on the dexcool antifreeze, u cant mix it with other antifreeze, there is a class action suiet going on now about the dexcool.. i replaced the gaskets but it had already been too hot...had to replace engine.....and used only dexcool, running excellent..
Sounds like a loose connection at the coolant temperature sender. Or, the truck is low on coolant and air bubbles are passing by the sensor. This, along with a gurgling heater core, is a classic symptom of coolant that is too low before the truck overheats. Paying attention to these clues allowed me to fill up a friend's truck with coolant as it was almost a gallon low, and he didn't even know it was leaking (Dexcool). If you are losing coolant, you may have an intake leak. It is a common problem around 65 to 80 thousand miles. I would have this checked, you most likely won't see a leak, unless you look from below by the back of the intake. It ususally drips out there.
If it is leaking under the truck it is not the heater core that is leaking. It would leak inside the vehicle on the passenger side. There is a drain tube for the A/C that is under the vehicle on the passenger side, and water from that with the A/C on is normal. If it is coolant, check the heater hose connections at the firewall. If you find that the heater core is actually leaking, replace it. No other repair is permanant.
she would get hot or leak or you would hear a funny noise in the front
no, but if its under the floor it may put a hole in it, we once had a truck with a hole in the floor and the floor mat caught fire! If the leak is large enough it can damage the exhast valves.
OK, why did you put that as a question?
plumber