Q: Heat blows cold when the car is idling

asked by on

My car has gone around 95,000 miles. When I drive and stop the car and it's idling, the heat would start blowing cold. What can cause this?

Hi there. The coolant level should be checked first as low coolant will cause this. If it is low then it may have a leak that needs to be found. If the level is fine then the heater hoses need to be inspected for restrictions or it may be the water pump failing and not circulating coolant. If you want to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose what’s causing the problem.

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
  1. Home
  2. Questions
  3. Heat blows cold when the car is idling

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 does not work and has a loss of power to the switches.

Hi there. If the motor works fine with power directly to it and when the switch is not working properly causing the motor to come on slower and weak, then switch cluster has failed and needs replaced. If you need...

Q: Serpentine belt broke, replaced it but lost AC. It broke again 2 days later

It would've been helpful to know if the A/C was working fine or having a problem when the first belt broke. I suspect that the A/C pulley is binding, causing the second and first belt to break. If the A/C...

Q: Car overheating 2006 Infiniti M35

Hello - the fact that your car maintains a steady temperature near design temp (center of the gauge), suggests the thermostat is working properly. Overheating while idling or at low speeds is usually a problem with a clogged radiator, faulty...

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 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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...