Q: Vehicle is starting to overheat at idle.

asked by on

Hello there. My Silverado has a cooling issue when sitting idle. If left for too long it begins to overheat with the temperature climbing steadily towards 235 and in a matter of no time, if left unattended for too long, will reach 260 (I have only done this once. Shut the truck down every time I leave it now). When driving down the road, the temp starts right at it just a hair below 210. When sitting at idle for lengths of time, as long as the heat is on full blast, it will just go past 210 reading in between the second and third line. I'm trying to determine if this is a failing fan clutch, thermostat, water pump or some combination of the 3. I have a degree in auto but have never been faced with this sort of issue. I'm not one to just throw parts at a vehicle either. I want to do the job properly and not have any other issues or unnecessary expense. Thank you in advance for your time and response on the issue.

My car has 157000 miles.
My car has an automatic transmission.

There is a technical bulletin TSB 04-06-02-006A that covers the issue you are getting. It states that the cooling fan clutch will disengage at lower rpm’s of the engine and will allow the engine to overheat. You should replace the cooling fan clutch with the new design that engages at the lower engine speeds and temperatures.

You may have to supply vehicle VIN to get the correct one for your motor. There are a couple different dealer parts listed depending on the motor ID you have. There may be aftermarket parts on the market but I cannot tell you if they will fix the problem you have.

If you’d like assistance with this, YourMechanic has mobile technicians readily available to diagnose your overheating issue and service your fan clutch if necessary. Best of luck.

Was this answer helpful?
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. Vehicle is starting to overheat at idle.

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: My car is giving me an error code - P2119

This code points to a problem in the throttle control actuator circuit. The ECU watches signals to and from the throttle body controls and reads the resistance in these circuits to make sure it tracks discrepancies in the signals; it...

Q: Engine cranking but no spark (no trigger signal )

Hello and thanks for contacting YourMechanic. The trigger for your ignition system lies within the computer system. Your computer is not allowing the ignition to trigger the power. The coil should have power to it and a ground wire. The...

Q: Overheating when fans off

Hello! It sounds like the system is working properly. The fans are designed to turn on when the engine reaches a certain temperature. However if the fans do not work properly the vehicle will overheat. If the vehicle has an...

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 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 Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...