took my ke70 over the pits today and found out the demister dosnt work, its not blowing any air

 

any suggestion why??

 

 

any help will be much appreciated :)

is the fan connected? it's got two terminals that connect to the demister box.

fuse?

Get out your trusty $10 multimeter and turn it onto 12V DC. Put the black lead on a metal fitting for earth, unplug the wires on the fan and stick a probe into each wire with it all turned on.

 

If you can find a 12V feed there then you know power is getting to the fan, it should be the LG wire.

 

You can see from the diagram the main feed is through the heater fuse and the relay is switched on via the wiper feed. So full power goes to the heater motor and the speed is controlled via its earth, like the headlights work. You should have power to the LG (blue/green) and the LR(blue/red) with with ignition switched on. If there is no power to LG it is a fuse or wiring connection, but power to LG and not LR means the motor is burned out.

 

If you have power to both those and the heater fan doesn't work on "high", then the switch or it's earth is borked.

could also be worn brushes. Toyota wont have any but you can probably find something useful at a bosch dealership.

 

Easy enough to change but will need soldering

turns out that the cable connection to the switch was broken, so it was stuck on vent

 

kinda looks like someone cut it, which i thought was weird

 

pushed the cable in and now its stuck on defog, which is fine as i need it to get over the pits