Q: Blend door and throttle actuation problems

asked by on

The computer says "no heat was tracked to the blend door," and the engine light says "throttle actuation." And nothing comes across the dash like it should. If the throttle needs to be replaced, the diagnostics indicate the car runs the way its supposed to, and it does run nicely.

The air conditioning on your vehicle is computer controlled. It has many sensors both inside the passenger area, pressure sensors on the AC unit, and external temperature sensors. If one of these sensors is giving the wrong information the system will shut down certain functions. This will most certainly trip a code that a technician can use to properly diagnose the issue. The same is true for the throttle issue. The throttle actuator is a motor that actually opens and closes the throttle when you step on the pedal. If there is a fault code recorded, just because the vehicle is driving on now, it does not mean it has not failed. Again, just like with the AC system, a fault code is usually stored with this type of fault. A mechanic uses these codes along with diagnostic information to properly identify faulty components. I suggest seeking help from a qualified mechanic, such as one from YourMechanic, to help diagnose both of these issues.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Blend door and throttle actuation problems

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Why is my car blowing hot air and cold air at the same time?

The answer to this depends on whether you have switched on heating, cooling (A/C) or neither. In one scenario, for example, if you have not switched on the A/C system, but the A/C is running as confirmed by a visual...

Q: throttle body replacement - new part is differnt

Hello, thanks for writing in about your Ford Mustang. From what you've described, the two lines are coolant lines and not vacuum lines. You can hook the two lines together or plug them. The coolant lines to the old throttle...

Q: Car shaking

Shaking or vibration may be caused by many different things such as faulty spark plugs, poor fuel pressure or misfires. Other things such as a faulty idle air control valve may cause the engine idle to drop below the normal...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...