:doh: Did you actually read my post?
Originally Posted by Kai
It sounds like the heater is stuck on. That could be a damaged part of the climate control system in the dash, a stuck heater valve, or similar.
Pulling fuses will NOT fix that. The heater is a purely mechanical system, hot coolant from the engine flows into a heat exchanger under the dash. The air coming though the vent system has to flow through the heater core, so if it is stuck on, it will blow hot air regardless of what temperature the slider is set at.
The engine takes about 3-4 minutes of driving to warm the coolant, that is why it will blow cold for a few minutes. There is no hot coolant in the heater core until the car warms up.
You must be thinking there is a little electrical heater in there... there isn't. The "hot" comes from engine coolant.