I recently purchased a 2016 ford fiesta turbo charged ST variation and lately, in 100+ degree weather it has started to overheat. It'll only overheat while going uphill with the a/c on. I was just wondering if this is normal due to all these factors or if it could be something else..?
Technically, as long as the engine operating temperature during these occasional excursions does not exceed 230 degrees, you are OK. Ideally, engine temperature should remain within a narrow band but there are a lot of variables to consider including vehicle cooling system design, operating environment, vehicle loading and so forth. If you are consistently above the 215-225 range, there probably is a fault in the cooling system.
The most common causes of overheating include low coolant level (including that due to leaks), a faulty thermostat, a plugged radiator, a faulty radiator pressure cap, collapsed hoses, non functioning cooling fans, and a faulty water pump or drive belt. Certain engine faults, such as a leaking head gasket or poor engine running condition can also cause overheating. If you desire that this problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine overheating diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.
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