Smoking under the hood and smells like ani-freeze. What could it be?

Could be a leak in one of your hoses under the hood, a water pump gasket, thermostat leak or bad heater core. Check under the hood for any signs of leaks. If antifreeze drip onto a hot engine block, you’ll smell it coming in through the vents. If you don’t find any leaks, I’d consider the heater core having an issue possibly.

The fact that you can smell it and the truck is smoking it means the anti-freeze is getting into the oil and burning. This means you have a blown head gasket

Are you sure that it is not steam?

A leak of some fluid, probably oil, dripping onto the exhaust. This smells terrible, and it only needs a drop or two.

smoke from exhaust could be cracked head or blown head gasket but normally when one of these two things happen it runs crappy if it runs at all smoke from under the hood you may have a pin hole in your radiator or hose or even heater core put some stop leak in it watch for puddle of anti-freeze under the hood and on the ground keep a close eye on your tempature gage and a close eye on you anti-freeze levels and dont add fluid when the motor is hot this will crack your heads good luck.

First you have to identify the source of the leak. Check the valve cover gaskets if leaking excessively they can leak on to the exhaust where the oil would burn and cause it to smoke and smell. It can also coat the O2 sensor and cause the check engine light to come on.

red positive black neg.

Well, the fluid from the radiator could be evaporating. Is the upper hose solid when you shut it off?

If you 'smell' antifreeze there 'is' a leak.

Is the fluid 50/50 strength antifreeze to water?

Usually, if there is a leak, it will drip to the ground or come out of the tailpipe (in the case of a bad head gasket).

It is not unusual to have a car with 108,000 mi. to have a leak somewhere.

Keep looking and topping off the fluid.

Smoking from where? Under hood it may be the valve covers leaking on the exhaust manifolds