Q: My heater only blows out hot air when going down the road and rpms reach about 2 if or when i slow down or stop it blows cold

asked by on December 18, 2017

my heater only blows hot air when driving down the road, rpms close to 2, if i slow down or stop it blows cold air normally when rpms below 2

My car has 200000 miles.
My car has an automatic transmission.

This can sometimes happen when the coolant level is low or leaking. The coolant gets hotter as the RPMs rise. This can cause hot coolant to reach the heater core during high RPMs but not low RPMs. I recommend having your cooling system inspected by a qualified professional to determine if there are any leaks. If any leaks exist in your cooling system I would recommend having the leaks repaired and the system topped off with new coolant in order to resolve this issue. Consider YourMechanic as this can be done at your home or office.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car heater not working

When the engine reaches operating temperature, the thermostat opens, allowing hot coolant to flow through the heater core. The heater core then heats the air that is blown through it by the blower motor. This makes the interior nice and...

Car isn't cranking

It sounds like you may have a problem with the battery cables. Check the ends by the battery thoroughly, especially if they have been replaced by universal ones. The main ground cable runs with the starter positive cable and is...

My car periodically won't start - 2005 Toyota Tacoma

Hello. I would need to know if the vehicle has an automatic or manual transmission. If it has a manual, it is typically caused by a bad clutch pedal switch. This closes the circuit for the starter when the clutch...

When the electric power steering system warning comes on, the car immediately loses gas and slows to a halt.... why does it do th

Hi there. Are there any other lights illuminated? When the EPS light does come on, the electric steering system has detected a fault and can cause the vehicle to proceed into what may seem like a limp mode; we wouldn't...

Slow Acceleration of Vehicle after start up

Hi there. That check engine light is probably the warning that something is afoul and creating your concern. There are more than likely codes and data stored to aid in the diagnosing of the concern. Remember that codes are not...

I need help to solve the code p0304 on my 2007 mustang gt i changed the coil and the sparkplug and the check engine light is still

Hello, thank you for writing in. You started out in the right direction as spark is typically what you check first when you have a misfire. With that out of the way, you do want to scan the vehicle again...

How do I replace the fuel pu on a 1990 Lexus es250

On this vehicle, the fuel tank has to be completely removed from the vehicle to access the fuel pump. The fuel pump is held in a retainer that is mounted in a large access hole at the top of the...

What is the cost of replacing your transmissions valve body, including the part and labor?

The cost depends on the model and engine type/size. Also, do you want a Toyota OEM valve body (new from dealer), a rebuilt valve body or a site re-built valve body? An additional complication is you have to be sure...

P0507 idle code

The code P0507 is for a problem with the idle control valve. If all other checks are good with vacuum leaks and inlet air tubes then you may need to replace the idle control valve.

Related articles

A Buyer’s Guide to the 2012 Nissan Cube
The The unique appearance of the 2012 Nissan Cube draws attention everywhere it goes. However, drivers appreciate the numerous standard features like speed-sensitive steering, keyless entry, cruise control and 16-inch alloy wheels to name a few. The result is a...
A Buyer’s Guide to the 2012 Nissan Armada
If If you need an SUV that lives up to the name “full-size SUV”, the 2012 Nissan Armada just might be your best option. With up to eight passenger seating and a 317-horsepower V8 engine that hauls 9,000 pounds with...
Understanding Nissan Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Nissan service indicator lights let you know when and what service your car needs.