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.

A: I would start by checking the <a href='http...

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.

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・Save up to 30%

Get a quote

What others are asking

Q: Randomly, car stutters, idles, stalls, and won't start

The Volvo 850's are notorious for having main fuel relay failures due to burned contacts in the relay. This will cause intermittent fuel delivery issues which result in stalling, shuddering, and no-starts. This is an inexpensive part to replace, and...

Q: My car overheated and wont start.

Hello. If you ran it low on coolant and overheated the engine, then you may have seized the motor. A motor does not run low on coolant without a leak or a head gasket problem. I would recommend having the...

Q: Brake pedal going to floor.

I strongly recommend this car not be driven before this problem is addressed as a safety concern. If the pedal goes down to the floor it means one of two things, either air has become trapped in the sealed system...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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...