Skip the auto shop - Our mechanics make house calls

Q: Only get heat when i rev up my car or push the gas. Other tham that i only get cold air coming out.

asked by on

I only get heat when im driving or i eev up the car. Itnwoll not get warm just sitting there. Then when i do get heat i only get it out of the driver side vents and its cold on the passenger side. I do not have dual controls. And i have had it flushed and coolant filled. When i got it flushed the heat worked better for a cpuple days then went right back to doing the same thing. I have gotten so many different answers from people i just dint know what for sure to fix.

My car has 175000 miles.
My car has an automatic transmission.

You may have a clogged heater core that may be prohibiting the outer linings of the heater core to get hot. As you know, the heater core is a series of tubes that the coolant runs through that generates the heat from the warm coolant after circulating through the motor. These tubes can occasionally develop a buildup on the inner walls such that when the heater core is "flushed" this buildup on the inner walls of the lines remains and still allows the coolant to flow through the heater core. It is important to note that when the heater core is "flushed" it is possible to get good flow through the heater core while the inside walls of the heater core remain caked with buildup. As a result, the buildup on the inner walls prevents the temperature from rising to its capability due to the insulating effect of this buildup on the inner walls which will prevent the necessary heat transfer to properly heat the inside of the car. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your heater core.

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
  • Home
  • Questions
  • Only get heat when i rev up my car or push the gas. Other tham that i only get cold air coming out.

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 making loud rumbling noise when on high 1996 Saturn SL2

Hi there - I believe the heater fan motor bearings are shot, and that's the noise you hear - increasing noise level as fan speed goes up. These bearings are generally not serviceable, and the fan motor should be replaced....

Q: Leaking fluids

It sounds like the car likely overheated pretty badly. The thermostat is not the only potential cause for an overheating vehicle, so replacing the thermostat may have done nothing to help the problem. It is possible for the car to...

Q: Car shakes and jerks

Hi there, when you say jerking do you mean a vibration or changing in speed? If the car changes in speed, then you should make sure your fuel pressure is okay. Other Impala owners have reported a shaking at startup...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.