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 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. 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: Jeep won't start, have a p0523 code

Diagnostic trouble code P0523 signifies that there is trouble with the oil pressure sensor circuit or an actual excursion, to the high side, in oil pressure. A "high" reading is being recorded by the PCM due to either electrical or...

Q: I have a P2771 code.

This code may be the result of a malfunctioning selector switch or an electrical problem within the circuit. The fault may not necessarily be in the transfer case itself, but the electronics can be tested. Consider hiring an experienced technician...

Q: Heater blowing lukewarm air. Had thermostat and gasket changed plus heater core back flushed. No change.

The heater is reliant on the engine temperature getting up to and maintaining normal operating temperature. Once this is verified then you can check both heater hoses in and out of heater core with blower on low speed and heater...

Related articles

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...
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...
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...