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Well thinking about the problem there e a flap in the vent pipes to shut off theatre and ac unit perhaps something has got in the pipe and stopping it closing or perhaps your heater control is US and needs replaceing . ( but I take it you have turned your heater to cold )
First suggestion, ensure the AC is properly charged... the AC system is very picky... so check belts pulleys and AC charge first... if the AC is healthy and this issue is still present... you have two possible solutions...1. heater control box in dash behind the radio...Expensive part $450+ and lots of labor to pull dash apart... or 2. the heater control valve in the engine bay... $130 part you can do IF you take your time
First, check the under hood fuse box, Fuse number 17 (40A) Heater Motor.
If that isn't it, leave a comment and I will investigate further.
Hope this helps you.
the only thing that can change the air from hot to cold, or vice versa is the blender door. under your dash is a box which has 2 compartments. one with your heater core which is hot and one with ac which is cold. the blender door basically diverts which on the air in your car is being drawn from. if it is cold, air is moving on the ac side. if its hot, air is moving through the heater core side. if its warm, the door is in the middle. your temperature control knob is conecteted to an actuator, which moves that door. the actuator is a motor, but if it goes out, the door will be stuck on whichever side it is on. i would check that first. hope this helps
Your problem is the air temp control blend door actuator is defective and not controlling temp u set. to change/access this part the dash assembly must be removed from the car.
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