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== == Could possibly be a heater core leak. Coolant is getting blown up through the vents when you have the heater on. May need to do a heater core check and replace. if you have the a A C on it means that your A C freon its leaking, also if you run the AC on with one window open it will create smoke fron the humidity coming in to the car if it's white somke it's dangerous "cause it will put you to sleep while you drive and you will not feel it..
What else can I help you with?
Where is the heater fan located in a 1993 Toyota Previa van?
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What is the freon capacity in the 1993 Toyota Previa?
4 pounds aproximatly
How do you prime the cooling system on a 1993 Toyota Previa?
By using water
How do you change a heater core in a 1993 Toyota Previa?
Follow the link below to the Previa user group.http://autos.groups.yahoo.com/group/previa/message/32333
How much oil for a 1993 Toyota Previa 4 cylinder?
approx 6.1lt
Does the 1993 Toyota Previa 2.4 petrol have a cambelt or a timing chain?
chain chain
Where is the electrical system of 1993 Toyota Previa?
above heater controls center of dash
Where to find replacement for front windshield wipers for Toyota Previa le 1993?
Most auto parts retailers can help you.
Where is the fuse box for a 1993 Toyota Previa?
push the a/c buttom in and lift the lock gently and take the cover off
I replaced my battery in my 1993 Toyota Previa and don't remember my radio code Is there an override code?
Call Toyota and give then the radio model # they Ill give you the code
Why does a Toyota 1993 Camry smoke?
The valve seals most likely.
Where is the fuel filter located on a 1993 Toyota Previa?
Driver side 1/2 way back under the along the edge.
