I would advise you to check out the Previa site on Yahoo. It is an excellent site.
Check this site it out http://tarago.blogspot.com/ , it helped a lot.
Get a Haynes manual - there's a lot of stuff to take off
The cover surrounding the stereo just clips on, give it a good pull toward you and it will pop off, the stereo will be right there...
On the panel I think it says radio
Remove the plastic panel, remove the bolts, disconnect the wires from the back of the stereo and remove
Toyota Previa was created in 1990.
how to replace a heater matrix in a toyota previa
remove the radiator, then remove 4 screws that holds the fan ,,done..
yes, you have. And change new seal too.
remove the radio.and once outside remove the tape deck wich is screw to te radio.
look in how to bleed air off cooling system