Q: Overheating car

asked by on

I put water in my car, but left the cap off and it started smoking white smoke, so I put the cap back on and the car overheated, took the cap off and heaps of water came out, and now the car keeps overheating what do I do?

Hello, thank you for writing in. To start lets discuss the radiator cap. The system is designed to work under a certain amount of pressure. If the cap is off, the pressure will release through the opening and cause it to overflow. If the system is overheating with the cap on, then there is a different issue. The first thing to consider is the water pump. If this is not providing adequate flow through the system, then hot coolant stays around the engine and does not transfer heat away from it. This will lead to overheating. The thermostat can also cause overheating by lack of coolant flow. It does this by not releasing new cold coolant into the passages around the engine. Check into the condition of these two components and take further diagnosis from there.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Overheating car

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: My car is overheating even after replacing waterpump and thermostat

Hi. It sounds like the heater core is clogged and restricting the flow of coolant in the coolant system. There is also the possibility that the new radiator is defective and is causing the car to overheat. The head gasket...

Q: What happens if the engine overheats?

If the coolant level in your car is low, the engine may overheat. The Fusion is designed with a fail-safe engine cooling mode that will activate if the temperature exceeds a certain amount. Here’s what you need to know: ...

Q: Overheating

Of course, be sure it is not just a temperature sender and/or gauge malfunction. If there is trapped air in the cooling passageways that can cause overheating. There are a few other common causes of overheating, namely a faulty thermostat...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.