Gas fumes 1995 ford windstar 3.8L smell like gas odor only the engine turned on and/or when heaters on its blow the warm air with gas fumes, white smoke from exhaust and yellow liquid dripping off from exhaust (the yellow liquid smell gas). After the the engine off, I could hear hissing sound at the back of engine, the hissing sound faded in a minute and then gone.

If the temp gauge is at normal, then what makes you think it is overheating? Are you experiencing water being forced out of the cooling under pressure? That is what makes some think the car is overheating. White smoke from the pipe can be normal, but only for a short time after start-up. If you smell the exhaust and can smell an anti-freeze odor in it, then you probably have a blown head gasket, cracked head, or cracked block. This can cause over-pressurization of the cooling system and coolant overflow. Usually, overheating accompanies this issue and is normally the original cause of it as well.

Smoke (blue or black) or steam (white)? White smoke is really steam that is caused by water leaking onto hot surface. Could be leaking from hose running to heater coil under dash, or something else. Check radiator water level to make sure water level is ok. Blue smoke is oil burning. This could be dangerous, caused by similar scenario of oil leaking on a hot surface (from a gasket leak, etc), or exhaust fumes. Black smoke means something is actually burning and could indicate fire. Black or blue some could fill vehicle cabin with toxic fumes, even if you don't smell anything bad.

burning very rich, is the check engine light lit?

bad news most likely its a head gasket , white smoke {moisture} black smoke [fuel or oil] - pull dipstick clean [ make sure engine is cool] look for over full on dipstick,look for moisture on dipstick, smell it to see if you smell gas odor

Valve seal leaks will cause an engine to smoke on start until the oil burns off. If a head gasket were leaking it would be smoking constantly.

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from my experience, that is the smell of gasoline poorly burning at start up. getting into the cab that badly means that the climate control is sucking in fumes from the engine area, incredible this being a 2010. there also may be a leak at the heater core that warms up the cabin, basically coolant fluid fumes . definatly a warranty claim, something is very wrong here. pursue this with ford. battery leakage is total nonesense.

if you are getting gas fumes it's on more then just on warm days.Turn on heater and see if it lightens up. Fan may be blowing exhaust away from intake if so. Exhaust leak at head

you need to change the valve cover gasket. try to tightin it up first, start in the middle and work your way around.

Try having the area that the hose was disconnected from steamed cleaned, or go to a car wash wash and spray the area. It might help, that is if you already haven't done so.

hello you are in need for a heater core what you are getting is antifreeze leaking into your heater box wich is very dangerous while your driving fumes can make you sick