Q: Vehicle is starting to overheat at idle.

asked by on October 21, 2016

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.

Car is overheating Inspection $79.99 - $99.99 Get a Quote
Fan Clutch Replacement $120.68 - $585.60 Get a Quote

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

If I am hooking up an aftermarket oil pressure gauge, do I need to keep the electronic oil pressure sending unit hooked up?

The aftermarket gauge that you are using would likely work either way. I would recommend trying to keep the factory sending unit in place if possible to prevent any potential issues that may occur. If the new gauge does not...

Does a 2011 audi Q5 use tubeless tires? I have a nail lodged in but tire has not deflated

Your vehicle uses tubeless tires. The tire won't deflate if the nail is very tight. That is typical and in fact lots of tires have nails, screws, glass shards and other objects but because these foreign objects can be really...

Both headlights went out (not at the same time) for 2013 Cadillac ATS. Checked fuses looked ok. Could both halogens go out at arou

If the bulbs are both the same age, it would not be exceptional for them to fail at around the same time. A standard halogen headlight bulb could operate as long as 1,000 hours or so. A long life bulb...

Where is the plug in for the code reader?

Your vehicle's OBD connector is located on the driver's side of the vehicle underneath the dash to the right of the steering column just above the gas pedal.

Tire and rotor problems

From the description provided it appears that you have quite the list of concerns going on with your Dodge Neon. With a situation with so many concerns, I highly recommend enlisting the assistance of a certified mechanic to come by...

Lights going in and out on my jeep.

You need to have your brake light bulbs checked for possible cross over connection inside the bulbs. The shorted bulb could do this. If all bulbs check out then the sockets need to be checked for making proper connections. If...

Related articles

The Best Used Cars to Buy If You're a Personal Assistant
As As a personal assistant, you have a lot of demands placed on your time. Often it’s important that you be able to get around town quickly, running a ton of errands, picking things up here, dropping them off there,...
2005 Jeep Wrangler vs. 2005 Chevrolet Blazer: Which One Should I Buy?
Sport SUVs are a class all of their own; these vehicles are meant for a fun drive through the woods and across the trail – but not necessarily to Grandma’s house! Think instead about going through the creek and through...
2012 Chevrolet Impala vs. 2012 Toyota Camry: Which One Should I Buy?
In the battle for the family vehicle, the 4-door sedan is a strong contender that just continues to be a viable option even with the rise of the crossover SUV and the popularity of passenger vans. These sedans offer a...