I bought a used 2003 LS430 awhile back. As far as I can figure out from the manual and fiddling with the controls, the only source of heat is the heated seats. Is that right? It is darn nippy in the car. I am thinking of knitting a mitten for my nose :-)

 

Is your heater not working?
How much coolant do you have in the radiator?
Does the engine temperature guage get warm?

 

Set your temperature settings to 74F and make sure that the climate control system is on.
Once the engine warms up the car should be nice and warm.
If you don't have the climate control setup correctly it will not heat up the car.

 

Is the fan working?

 

That's it. I must have known this last winter, but it fell out of my brain.