Skip the auto shop - Our mechanics make house calls

Q: Overheating, drop in oil pressure when coming to a stop

asked by on

I just bought a used vehicle and noticed that when i come to a stop and ive been driving for a while, the engine will start to overheat, a/c wont cool, and the oil pressure gauge will drop. Can you give me opinions on what this could be? My cooling fan works and im not loosing coolant, that i know of.

My car has 204000 miles.
My car has an automatic transmission.

I would start by checking the thermostat. If this is not working correctly, the car will quickly overheat. Driving may temporarily keep the temperature down due to wind circulation, however once you are stopped this goes away, especially if the coolant is not flowing properly.

You may also have a problem maintaining oil pressure as you mention a drop when you come to a stop. As you know as engine RPM’s are higher more oil pressure is maintained and thus temporarily keeping the oil pressure up, however if there is not enough when the RPM’s come down so will the pressure.

I would check the oil pressure sending unit as well as the oil level itself to be sure:

  1. You have enough oil.
  2. the oil pressure sending unit is working properly.

As to the A/C, you will want to check to be sure there is enough refrigerant in the system, check the A/C relays to be sure they are coming on at the right times, etc. I would recommend having an expert from Your Mechanic coming to your home to diagnose your overheating issue and 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: check engine light

Be sure the bulb for the check engine light has not simply burned out. To determine this, turn the key to the "on" position. If the check engine light briefly illuminates and then goes out (the light will normally illuminate...

Q: My truck is overheating and when I turn heat on only cold air comes out?

Hi there. Check for any external coolant leaks. Look at the radiator, heater hoses, radiator hoses, heater core, and the core plugs (freeze plugs) on the engine and see if there is any visible coolant leaks. If there is no...

Q: Rattle noise

Hi Mitchel. Typically when you hear rattling while the vehicle is in motion it's due to something loose within the driveline system. This could range from the input shaft, U-bolts, or even loose brackets that hold the driveshaft in place....

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
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.