Q: Truck over heating

asked by on August 12, 2016

2003 Yukon Denali xl.... At idle, AC on, engine starts running hot. I already replace fan clutch water pump and thermostat... What else could it be?

My car has 156000 miles.
My car has an automatic transmission.

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

How do you open the trunk without using the key or remote?
While you can definitely use the remote or the manual key to open your trunk, you can also open it from inside the vehicle. Here’s what you need to know: Locate the trunk release button. Push the button. The trunk...
How often should I change the coolant?
You should change your coolant every five years, or 150,000 mile-, whichever comes first.
Wipers are streaking
Stock wiper blades are pretty generic in terms of quality. Most manufactures choose cost over quality when it comes to wiper blades. If you want a dependable long lasting wiper blade I recommend rain x latitude blades. I've had a...
Leaking at water pump
Hello. If you had a sudden loss of engine oil and then the engine stopped running then you may have an engine failure. If the engine loses enough oil, then it can not longer lubricate the engine and it will...
Water pump is squealing
The water pump may be the cause, but it may also be the tensioner and pulley. The belt would need to be removed, and water pump pulley, as well as all other pulleys, checked for binding or problems. I recommend...
What happens if my gas cap is loose?
If your gas cap is not tight then the computer will detect a leak and cause the check engine light to come on, or it may illuminate a "check fuel cap" light if your car is equipped with one. You...
Problem with emission control code P0440 Check Engine Light. Is that a major problem and how do you fix?
Hi there, A P0440 code (https://www.yourmechanic.com/article/p0440-obd-ii-trouble-code-evaporative-emission-control-system-malfunction-by-jay-safford_2) is stored for an emission related fault; evaporative emission control malfunction. The evaporative emission system is responsible for preventing the release of fuel vapor into the atmosphere. When there is a fault in the...
Why do I need to charge my car's battery ever week or two but I cannot find an obvious problem withe the electronic system.
If you are starting the car and only operating it for a very short period, such short duration operation does not give the car's charging system sufficient time to re-charge the battery. Consequently, repeated short trips, especially in cold weather...
Car is sputtering when warming up in the morning.
Hi There, If the sputtering only happens when the engine is cold during warm up, this may suggest you have a problem with the cold start injection system. When you start your vehicle in the morning and turn the key...

Related articles

How a Car's Cooling System Works
Have Have you ever considered the thousands of times explosions occur in your engine? If you're like most people, that thought never enters your mind. Every time a spark plug fires, the fuel and air mixture in that cylinder blows...
A Buyer’s Guide to the 2012 GMC Yukon
When When you want a big SUV that can hold its own, come what may, you’ll be happiest with a GMC Yukon. Although the inside of one of these vehicles can sometimes resemble an upscale hotel room, the 2012 GMC...
How to Buy a Good Quality Cooling System Flush
Your Your radiator does the important job of helping to keep the engine cool. Overheating can cause serious, expensive damage like a blown head gasket (which typically requires complete engine replacement) or warped cylinders. The radiator circulates and cools the...