Smoke is coming out of my vents - 1988 Ford F 150

White smoke is usually indicative of a blown head gasket. Usually if you have blue smoke it's oil......If you have white smoke and possibly a "sweet" smell to it, that's normally coolant.
If it's coming out of your vents then I'd say you need new gaskets now. What's happened is the gasket blew out so bad that the smoke made it's way through the vent system, it's also coming from under your hood I bet giving my past experience with this.
Definitely new head gaskets to fix this though.


More Information for VICTOR REINZ 5940

Is it smoke or fog ?

You have a blown heater core,

The most likely cause is a leaking heater core

If it is a kind of sweet smell then your heater core needs to be replaced. It's leaking and you should keep an eye on your coolant level until you get it fixed. The smoke is coolant. Hope this helps.

check coolant level.sounds like a leaking heater core.

Are you sure it's smoke? Probably not smoke, the coils are freezing up and the air is so cold it condenses and looks like smoke coming out.

if it smells like sweet antifreeze, it is
the heater core is not he A/C evaporator core.

the core fails due to not replacing the antifreeze coolant before it goes acidic ... (not doing service here)

are you getting leakage under the dash near heater box, blower area?

depending on how bad, and how long the orginal core leaked, it might just be residue in heater box, and if it got up into the vents, it will take awhile for it to dry out.

antifreeze i think,heater matrix leak ,try putting a rad leak stopper in