Skip the auto shop - Our mechanics make house calls

Q: I changed my antifreeze yesterday, while sitting at an idle in my 1995 Nissan Altima, i have heat. But driving down the road I hav

asked by on

I have heat at an idle but no heat while driving

My car has 130000 miles.
My car has a manual transmission.

Hi there. From the description you have provided and assuming this was not a problem, prior to changing the antifreeze leads me to believe, there is air trapped inside the heater core. Sometimes, the air will purge on its own, and all you have to do is add more antifreeze to the radiator with engine cold. Sometimes, it is necessary to purge the air. This requires experience to purge the air. If, this was a problem before the antifreeze change. It could be, a faulty (stuck open) engine thermostat. I recommend your vehicle’s no heat while driving be diagnosed and repaired by a certified technician from YourMechanic.

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!
  • Home
  • Questions
  • I changed my antifreeze yesterday, while sitting at an idle in my 1995 Nissan Altima, i have heat. But driving down the road I hav

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: Heater/AC blows a burning smell

Hello. It sounds like you have a burnt out wiper motor. Due to the motors location, when it fails, the smell from the motor enters the ventilation system in the car. I typically start by checking the power going to...

Q: What happens when the vehicle security system is activated?

If your vehicle security system was armed correctly, it should activate when someone attempts to break in through a door, a window or the trunk. Here’s what should happen: The headlights will flash. The horn will honk. After...

Q: How do I lock the doors with the Intelligent Key?

The Intelligent Key allows you to lock the doors of your vehicle without actually using the key. All you need to do to lock the doors is exit your vehicle, and make sure all of the doors are closed. Then,...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.