Skip the auto shop - Our mechanics make house calls

Q: After fixing my radiator, radiator hose, thermostat, and idle control valve my car continues to idle very high and run hot. Help??

asked by on

When I crank my car it idles extremely high but I have already changed the control valve. Also, I have changed my radiator, radiator hose, and thermostat all which needed to be changed and my car still runs hot. Any professional suggestions because family members that know about cars and mechanics have all said that it can only be the heater core or the water pump but I don't know which one it is and I am afraid that I'll fix the wrong thing.
My car has an automatic transmission.

Hello, high idle can be represented by many conditions. A heater core would not cause this unless you have a coolant leak and the core was leaking. There are tests that can be performed to test a water pump (coolant pump). A vacuum leak can create high idle and even a high engine temperature. A suggestion is to read engine data and any fault codes in the system. This is done with a scan tool. The scan tool can read data which will give you information on the operating systems of the vehicle. If you’d like, a certified technician from YourMechanic can come to your location and do a complete evaluation of the overheating issues.

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
  • After fixing my radiator, radiator hose, thermostat, and idle control valve my car continues to idle very high and run hot. Help??

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: Chevy equinox won't move out of drive way.

Hi there. First check the transmission fluid and make sure that it's full and red in color. If the fluid is full, then the issue could be either the transmission valve body (module) has debris inside it causing the circuits...

Q: i had my complete brake system replaced. vacyum booster wheel sensors traction contril module master cylinder rotors and pads. ye

It sounds like you may be having an issue with your transmission rather than an issue with your break. I would recommend having your transmission inspected by a qualified professional in order to determine the exact cause of this issue....

Q: Emergency brake light on

The red brake light is primarily lit when you apply the emergency brake, but it also lights up when you have a hydraulic problem with the brakes. Things like low fluid levels, leaking wheel cylinders, or brake hoses can also...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.