Skip the auto shop - Our mechanics make house calls

Q: My car runs hot, then cools down, and then heats up again

asked by on

Car runs hot then cools then will heat up again. I I have no warm air coming into the car when the car is running hot I've been putting antifreeze in but it's using it up as fast as I can put it in is it possible that my water pump is bad

My car has 149688 miles.
My car has an automatic transmission.

Hello. Your attention should be turned toward the fact you are going through a lot of coolant. If you can not visibly see a leak spraying or any evidence of a leak on the ground, then your engine is consuming the coolant. You should check your oil and see if there is any milky looking fluid or residue there. This is going to tell you whether coolant is mixing in with your oil, and the cause in this case would likely be a failed head gasket. These are easy to replace, but very hard to access, making for a tricky repair. Not that we recommend inhaling exhaust fumes, but if you smell a sweet odor coming from the vehicle, that too is a sign you are burning coolant. A cracked head will also cause this symptom. Further testing and an inspection by a certified technician, such as one from YourMechanic, is needed to properly diagnose your coolant level problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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

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: Bubbles and pressure in the overflow tank

If the coolant level was low due to a leak, such leaks can be found during a leak diagnostic with simple pressure testing. If the cooling system doesn't maintain pressure, and no external leak is visible, coolant could be leaking...

Q: What is the prcedure of replacing an accelerator pump on a 73 monte carlo with a 2 BBl

For a carburetor and car of this age I would not recommend just trying to install another accelerator pump in the carburetor. The fuel system in this car was not designed to work with the new fuels in use today...

Q: Corrosion around my water pump 2001 Toyota Camry

Hi there - while your water may not be the source, there is a small leak of coolant onto the water pump which is the cause of the corrosion you mention. Modern coolants cause some oxidation of aluminum over time,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...