Skip the auto shop - Our mechanics make house calls

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 1000 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!

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: Where is the Heating A.C. door actuators2 Lesabre Custom with manual control.

It is attached to the HVAC assembly behind the glove box. Sometimes you can remove the glove box and access it and other times you will need to remove a good portion of the dash. This is determined on a...

Q: reduced power and a question with the throttle body.

You got a loss of power due to a fault with the system closing the throttle as a built in safety factor. The reduced power indicator is telling you that it went in to a failure mode and caused the...

Q: How much to replace my power steering pump?

As you might know, the power steering system operates on very high pressurized hydraulic pressure (in some cases as much as 300 psi). As a result, the pump works very hard to maintain the ability to assist turning your steering...

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.