look in how to bleed air off cooling system
In the 1992 Toyota Previa, the spring in the door lock mechanism is typically located within the door latch assembly. It functions to return the lock to its default position after being actuated. To access it, you usually need to remove the door panel and then disassemble the latch mechanism. Always refer to a service manual for detailed instructions specific to your vehicle model.
To replace the rear door lock on a Toyota Previa, first, remove the interior door panel by unscrewing any visible screws and carefully prying off clips. Disconnect the wiring harness and remove the old lock mechanism by unscrewing it from the door. Install the new lock by securing it in place, reconnect the wiring, and reattach the door panel. Finally, test the lock to ensure it operates correctly before finishing up.
remove the screw that holds the inside handle of the panel then pry the top portion of the panelremove three screws that hold the bottom portion of the panel raise the glass then look inside where the lock goes remove the linckage that operate the lock remove the horse shoe clip that holds the lock and install the new one and reverse the prosiguies....
push the a/c buttom in and lift the lock gently and take the cover off
If the driver side door lock on your 1992 Toyota Previa is stuck, it could be due to a few reasons, such as dirt or debris in the lock mechanism, a faulty actuator, or a frozen lock in cold weather. Start by applying some lubricant, like WD-40, to the keyhole and trying to unlock it with the key. If that doesn't work, you may need to remove the door panel to inspect the internal components for any obstructions or damage. If the issue persists, consider consulting a mechanic for further assistance.
Turn the key to acc. and push the plunger in located on the Ignition lock housing
could be a short in the lock switch ,or there is a short in the door wiring some wire its binding with metal some where
To change the ignition key core on a 1992 Toyota Previa, first disconnect the vehicle’s battery to ensure safety. Remove the steering column cover by unscrewing it, then locate the ignition switch assembly. Use a flathead screwdriver to press the release pin on the ignition lock cylinder while turning the key to the "On" position, and then pull out the old cylinder. Finally, insert the new ignition key core, ensuring it clicks into place, and reassemble the steering column cover.
Sounds like "heater core" is shot-any coolant leaks inside the car coming from under the dash?, Have check, replaced. Or could just be an air lock in coolant system, which is better easy fix.
Remove the door panel, remove the lower side of the window channel, remove door lock mechanism. remove the black plastic cover help by 2 screws, then remove the black plastic door lock unit, with the connector on it, and replace. You can pry the unit open and replace the electric motor in it.
I have discovered the same problem for my 93 previa lx. One solution to solve that is when you're driving lock your doors, then when leaving manually open and lock it (w. out using the button). If you turned off your motor and locked your doors w. the switch. The car alarm will go off randomly. I'm not sure this would work. but you can try to ask the dealer to remove the alarm. But using my method above, will keep the van from going off =].
looks like you need to replace the actuator that activate the power locks in inside the door, but before you do that spray some elctric contac cleaner on the elements on the side of the door .