Puff of smoke from crack between heater vent and dash
I had my defrosters on and a puff of thick, white smoke came out of the crack between the heater vent and the dash. The heater vent was the arched one (on the right) above the radio area. It smelled like melted wax. I immediately turned off the defrosters and fan. I drove the car home and there was no more smoke or smell.
The puff of smoke was about 4" high and went straight up. It didn't come out of the heater vent.
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Sorry but white smoke is a sign of water getting into 1 or more cylinders.I would pull the oil dipstick and see if it looks like a creamy color.If it does then you may have a blown head gasket or a crack in the engine block somewhere.
If you see a wispy, lingering white smoke that has a bittersweet smell, this is an indication that your car's engine coolant is leaking into the combustion chambers. This may be due to a leaky head gasket, or in a worst case scenario, a cracked cylinder head.
Make sure to take your car to the shop right away to get it fixed.
Thick white smoke---
If your vehicle is belching white smoke upon start-up, it is a sign that transmission fluid is entering the combustion chambers, possibly though a vacuum tube that connects the engine to the transmission. This type of smoke can be confused with the normal puff of steam during start-up. If you are not sure, have your car inspected at the shop.
Blue/White Smoke-- A blue/white smoke is an indication that oil is being sucked into the combustion chambers through the valve guides. A quick fix for this problem is by replacing the valve seals. Valve seals are small, umbrella shaped pieces of rubber.
white smoke is water blue smoke is oil. nest time try and smell the white smoke see if it smells sweet? if it does its antifreeze. and also black smoke is fuel (like a leaky injector ) hope this helps paul