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

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 aclogged 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 thethermostat is not opening.

An overheat could also be due to the cooling fan not coming on due to abad relay,bad fan motor，或温度传感器不良。

One other thing that this overheating could be caused by is afailed 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 toinspect and diagnose this overheating issue for you, and make or suggest any repairs as needed.