Skip the auto shop - Our mechanics make house calls

Q: Overheating

asked by on

So i replaced the thermostat and got a brand new radiator because of calcium build up it helped alot but my car is still overheating more than it should be. There is no milky oil and the spark plugs are clean so i have no reason to beleive that i have a broken head gasket
My car has a manual transmission.

The next thing to suspect is the water pump. You have already seen corrosion in the radiator, so you can expect the water pump to be the same. You can test this by removing the water pump bypass hose, a heater hose, or any hose that you think will be flowing coolant when the car is cold. Once a hose is removed, start the car. If it shoots coolant out, then the pump is working. If it doesn’t, rev the motor a bit and see if it shoots water out. If not, you need a water pump. Keep in mind, the amount of flow to expect to see is subjective. It takes experience to know exactly how much flow to expect. If your unsure, you will need to remove the water pump and inspect the impeller.

If you discover the water pump isn’t the problem, the next thing to suspect is the head gasket. You can test this by renting what is known as a block tester from your local auto parts store. Be sure to read the instructions thoroughly before you begin using it. Youtube is a good resource for instruction on this.

If you decide to get some help with this, consider YourMechanic, as a certified technician can help you diagnose your overheating issue and help you figure this out firsthand.

Good luck!

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

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!

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: The car battery doesn't seem to be charging I replace the alternator and the battery the car runs for about 10 minutes and everyth

This may be related to a failing voltage regulator or potentially a bad ground connection. As you may know, the voltage regulator regulates the amount of charging the alternator provides to the battery. When this is not working correctly, this...

Q: Code P0441 pops up

Trouble code P0441 only means you have a leak in the vapor EVAP system and a proper diagnoses is needed to see where the problem is. A leaking hose, purge valve, or even gas cap can cause the code. A...

Q: Starting

Hi there. We typically do not offer repair or maintenance on aftermarket part upgrades or modifications. However, in this case, it is very likely that your issue is caused by a restriction of fuel inside the fuel lines when it...

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.