Having problems with your 1994 Ford Taurus ?
Smoke coming out vents when defrost is on and temp gauge goes up and down in 1994 Taurus
The fluctuation in the temp gage indicates a low coolant situation. The smoke you see from the defroster vent is actually antifreeze that is leaking from the heater core somewhere and as the antifreeze evaporates from the heat it causes a vapor to produce. You should smell a very sweet smell when you see the vapor. If so it is definitely antifreeze. Find the leak and fix it. Then refill your coolant system to specs and you should be good to go.
Repair Help & Product Troubleshooting for 1994 Ford Taurus
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