Q: Won't blow heat on the inside

asked by on

The heat will not blow on the inside the thermostat has been changed and the heater core has been flushed. What do I need to do?
My car has an automatic transmission.

You should start and run engine for at least 5 minutes at 2000 rpms to warm the engine up to full operating temperature. Set heater on medium blower speed and measure vent temperature as temperature is increased with controls. If there is no temperature change at all then the most common cause is the temperature control actuator on the heater a/c temperature blend door. Replace the actuator and check door operation when actuator is off to be replaced. This checks door operation.

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. Won't blow heat on the inside

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: No power when I turn the key.

Check the battery ground cable (black cable going to the chassis of the car) to be sure you have a proper ground connection as this sounds like a common ground problem. Also, check the battery health to be sure it...

Q: Just replace iac, tps, new hoses and cleaned throttle body, and still have a high idle. 2200 rpms everytime.

This may be a sign of a vacuum leak. High idle speeds or in some cases rough idle, stalling and hissing sounds are common signs of a vacuum leak. When a vacuum leak is present in an engine, this causes...

Q: Is spending $6000 for repairs too much on a 2006 Navigator

When you look at the pricing for a brand new similar vehicle of over $40,000 and up $6000 to replace the motor with a new one may seem to be acceptable. You should look at and get the overall value...

Related articles

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...
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.