Skip the auto shop - Our mechanics make house calls

Q: Is my thermostat the problem or is it my oil pump? I've been researching but I don't know for sure.

asked by on

I got this truck from my brother over a year ago. Before I got it, I replaced the thermostat twice. It drove well all fluid levels were fine. Then back in July this year, my oil pressure gauge started going down when I'd stop then level off when I started to drive again. I checked the oil it was fine, I had a diagnostic ran on it nothing showed up. Well a couple of days ago the truck started to overheat. On my way back from AutoZone on Saturday, the truck started making a rattling sort of noise, and my temperature ran past the red. I barely got back to my apartment before it stalled out. I waited till it cooled down started it and parked it correctly. So what do you think? I'm not by any means familiar with what could be wrong, I've just researched and been asking questions, please help me out with some advice

My car has 177600 miles.
My car has an automatic transmission.

Hi there, thanks for writing in. The problem with oil pressure and overheating issues is that there are several individual components that may not be working correctly to cause these issues. My first guess would be that the thermostat on the radiator has failed, causing the accelerated overheating problem. However, the rattling noise also may indicate a problem with the water pump or radiator itself. The rattling noise may be coolant inside the oil, which is usually caused by a blown head gasket. The best bet for you is to contact one of our local mechanics to complete an engine is overheating inspection before you run out to buy any parts or to get quotes on repairs. This will allow the mechanic to determine the precise source of your problems and recommend the right corrective action.

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!
  • Home
  • Questions
  • Is my thermostat the problem or is it my oil pump? I've been researching but I don't know for sure.

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: Changed oil pump, still no pressure

Hello. At this point, it would be wise to hook up a mechanical gauge at the oil switch port and see if you are truly experiencing a low oil pressure issue or if there is something else going on. ...

Q: right rear wheel making dragging noise after hitting curb

Hi there. If you're hearing a dragging noise from the wheel that hit the curb, it's more than likely that you've either bent or damaged the wheel itself, a hub cap (if your car has one), or possibly suspension...

Q: What are the odds of all injectors(or however many it takes for truck not to start) get clogged up. Truck was running fine and now it won't start.

Hi there. Check the fuel injectors for power to the harness on each injector. Make sure that there is a voltage reference. If there is no voltage reference, then there may be an issue with the main harness from the...

Related articles

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...