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.

A: Hello, high idle can be represented by many...

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!

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: Audi A4 makes noise In Sport Mode

Switching to sport mode only changes the transmission software. So I don't think you are actually experiencing a transmission problem. But the "sport mode" program enables the engine to reach higher speeds before shifting gears, so it could be that...

Q: Front weels will not turn after hitting curb

As with any accident that damages the steering control, you will need to not try and drive the vehicle until you have the vehicle fully inspected to see why you lost steering control. You may have broken the tie rods...

Q: Car is making unusual sounds - 2004 Chevrolet Impala

Hello, the engine position is such that all the rotating components are located on the passenger side of vehicle area. There is a coolant pump, alternator, pulleys, and a power steering pump that require a belt to rotate them. The...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...