Skip the auto shop - Our mechanics make house calls

Q: Why does the heater

asked by on

The heater and air conditioning only blow high when driving 45mph and over. When sitting at idle and the dial is set at 4-6 the air coming out of the vents is very faint if any at all

My car has 86000 miles.
My car has an automatic transmission.

A: Hello. There are several components that ca...

Hello. There are several components that can cause the blower motor to fail. Have you been having any other issues with the car? Start by checking the level of your coolant. The thermostat can also hinder the flow of coolant through the system. Both of which would cause the heating and cooling systems to malfunction. The second and possibly more critical issue is why the coolant is low. This means the cooling system is either leaking, or the engine is consuming the oil. If you do not see any visible signs of a leak, top off the coolant and keep an eye on the level. Check the coolant level in the radiator and overflow reservoir. Top off the coolant as needed and test the heating and A/C systems.

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・Save up to 30%

Get a quote

What others are asking

Q: My brakes stutter sometimes - 2007 Chevrolet Silverado 1500 Classic

As you may know, your car is equipped with wheel speed sensors at each of the four wheels. These monitor wheel speed while relaying this information constantly to the ABS and traction control system, which are controlled by the car's...

Q: There is a loud noise driver side

Hello there. Many different faults can cause a noise with your 2007 Chevrolet Cobalt. The most common would be the brake rotors and pads, something stuck in the rotor backing place, strut mount, wheel bearings, or a failing tire. You...

Q: Just put new alternater on but battery not charging

The alternator in your car charges your battery with the assistance from the voltage regulator which is something that regulates the amount of voltage being sent to the battery via the charging from the alternator. It's function is to not...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...