Skip the auto shop - Our mechanics make house calls

Q: Why would my Cadillac escalade overheat? It's at 215,000 miles.

asked by on

Our Cadillac Escalade 2003 with 215,000 miles has just started overheating and we have no idea what could be causing this.

A: Hi, thanks for writing in. I’d be happy to ...

Hi, thanks for writing in. I’d be happy to try to help you with this issue.

One thing that can cause an overheat is a clogged cooling system. If any part of the cooling/heating system is clogged, then the coolant cannot circulate. The radiator or heater core could be clogged.

Another is that the thermostat is not opening.

An overheat could also be due to the cooling fan not coming on due to a bad relay, bad fan motor, or bad temperature sensor.

One other thing that this overheating could be caused by is a failed water pump. The water pump impeller could have sheered off internally and is not circulating coolant.

If the cooling system has never been serviced or it’s been some time since it has, the least expensive place to start is replacing the thermostat and flushing the cooling system.

If you would like help looking at your car, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this overheating issue for you, and make or suggest any repairs as needed.

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: Check engine light is on, had it checked out they said thermastat but its not running hot. Do I really need to put in new thermos

Hi there. Unfortunately, without knowing what type of error code caused the check engine light to illuminate, it's difficult for us to give you an accurate recommendation of repair. It might be a good idea to have a professional mobile...

Q: Radiator / heater core issues 2002 Dodge Ram 1500

Hello - these two unfortunate events are probably only related in the sense that they are both caused by advanced mileage and age. New radiators utilize plastic end tanks that are crimp-sealed onto an aluminum fin section. The plastic in...

Q: Is the water pump internal,or external on a 2003 Mitsubishi Outlander

Hi there - the water pump on this model is on the external face of the engine block, as are most water pumps. However, it is "behind" the timing belt components, which must be removed to change the water pump....

Related articles

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...