Climate & Cooling guide
Why Is My Car Overheating? Causes and What to Do
Written by the ASE-certified technicians at Auto Repair Shops America · 15+ years of hands-on repair experience
The short answer
Cars usually overheat because of low coolant from a leak, a stuck thermostat, a failed water pump, a clogged radiator or a broken cooling fan. If the gauge climbs, turn off the A/C, turn on the heater, pull over and shut the engine off.
Common causes of overheating
Coolant leaks from hoses or the radiator, a thermostat stuck closed, a worn water pump impeller, or a failed electric cooling fan.
What to do immediately
Switch the heater to full hot, pull over, turn off the engine and wait at least 30 minutes before checking coolant.
Risks of driving hot
Overheating can warp cylinder heads and blow the head gasket — repairs that can exceed $2,000.
Frequently Asked Questions
Can I add water instead of coolant?
In an emergency, yes, but have the system properly filled afterward.
How much does a water pump cost?
$350–$800 installed on most vehicles.
Get it fixed by a mobile mechanic
We come to you in 30+ metros including Dallas, Houston and Los Angeles.
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