Skip the auto shop - Our mechanics make house calls

Q: Overheating

asked by on

My father and I replace the thermostat on my vehicle over the weekend. This was Saturday. We both inspected my vehicle after it running hot a couple time. and came to the cheapest conclusion. Replace the thermostat. Low and behold when we removed the the thermostat from the housing the gasket was worn. And it was closed shut. We were pretty excited that we guessed correctly. We replaced the part and it ran fine for about 25mun with out over heating. The next day I perpared to go to work and it start to run hot about 5 ,miles from the house . Later that evening we relived some of the air pressure from the water pump reserve to see if that was the culprit. But it didn't help much. I have no leaks under the car and no cloudy oil that would indicate a blown gasket or cracked head. Please, what do you think the prob could be?

My car has 227000 miles.

This can be caused by a number of things such as low coolant levels or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this switch is not working properly, this can cause the fans to come on intermittently, all the time or sometimes not at all. When this happens you will notice a temperature spike and drop occasionally as the fan comes on and off.

When driving down the road at a decent speed, the temperature level may stay relatively low due the cooling effect of the wind passing through the radiator. When the car sits still at an idle, if the cooling fans are not working properly you may notice the temperature spike a bit due to a lack of air flow to help cool the radiator down.

To avoid any unnecessary repairs, I would suggest having an expert from Your Mechanic come to your home to diagnose your cooling system and help you make the right repair.

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: Overheating problems

Hi. Overheating is typically caused by three main concerns, either not enough coolant in the engine, not enough flow of coolant, (stuck closed thermostat, pinched hose) or the radiator isn't exchanging heat fast enough. If the coolant level looks ok...

Q: 2000 Toyota 4runner-both oxygen sensor replacement

If you input your year, make and model, as well as location (zip code) at YourMechanic's oxygen sensor replacement service page, the exact written quote you desire will be provided. Generally, after about 100,000 miles of use, it's not a...

Q: What does the Service Traction Control message mean?

The Service Traction Control message can appear in the driver information center (DIC). When the DIC displays this alert, there is an issue with the traction control system (TCS), and your vehicle needs to be serviced. After the TCS issue...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...