What to Do Immediately If Your Car Overheats
If your temperature gauge is in the red or the dashboard warning light is on, act fast — an overheating engine can suffer catastrophic damage in minutes. Here's the step-by-step:
- Turn off the AC and turn on the heater — this pulls heat away from the engine through the heater core.
- Pull over safely as soon as possible — don't try to make it home or to the shop. Every extra minute risks head gasket damage.
- Turn off the engine — let it cool for at least 15–20 minutes before opening the hood.
- Never open the radiator cap while the engine is hot — pressurized coolant can cause severe burns.
- Check the coolant level once cool — if it's low, top it off with water as an emergency measure and drive slowly to a shop. If coolant is pouring out, call a tow.
Why Your Car Is Overheating — 6 Common Causes
1. Low Coolant (Leak)
The most frequent cause. A cracked hose, a leaking radiator, a worn water pump seal, or a failing head gasket can all let coolant escape. Sometimes the leak is slow enough that you don't notice until the gauge spikes. Spokane's summer heat above 100°F pushes a low-coolant system over the edge fast.
2. Failed Thermostat
The thermostat regulates coolant flow. If it sticks closed, coolant can't circulate through the radiator and the engine overheats quickly. This is one of the cheaper fixes when caught early.
3. Broken Water Pump
The water pump circulates coolant through the engine and radiator. When its bearings fail or the impeller corrodes, circulation stops. You might hear a whining noise from the front of the engine before full failure.
4. Clogged Radiator
Years of mineral deposits and corrosion can clog the tiny passages inside a radiator, reducing its ability to shed heat. A radiator flush can help in early stages, but a severely clogged radiator needs replacement.
5. Failed Radiator Fan
The radiator fan pulls air through the radiator when you're stopped or moving slowly — like in Spokane's downtown traffic. If the fan motor fails or the relay burns out, you'll overheat in traffic while running fine on the highway.
6. Blown Head Gasket
This is the expensive one. A blown head gasket lets combustion gases into the cooling system or lets coolant into the cylinders. Symptoms include white exhaust smoke, milky oil, and coolant loss with no visible external leak. Driving with a blown head gasket causes progressively worse engine damage.
Spokane-Specific Overheating Risks
Spokane's 100°F+ summer days combined with the I-90 grades between downtown and the Valley put extra thermal load on cooling systems. If your car runs even slightly warm on a hot day, get the cooling system inspected before the next heat wave.
Call All Motors Center at (509) 655-7715 for a cooling system inspection. Catching a $30 hose before it becomes a $2,000 head gasket repair is always worth it.