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

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!

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: 1997 Chevrolet Metro won't start won't turn over

Hello. It sounds like the timing belt is not in time and if the timing is off, the engine will not start. When replacing the water pump, the timing belt must be removed and this could affect the timing of...

Q: Cars overheating but engine is cold and the heater blows cold air

Hello...the simplest option is to just request an engine overheating diagnostic and the responding certified mechanic will identify the root cause(s) of the troubles you are writing in about and get the repair estimated for you. Repairs can be commenced...

Q: My car will start but won't move

Hello, and thank you for writing in. Your symptoms are pointing to an unresponsive transmission. When the transmission fails to respond, the first thing to do is check the level of the transmission fluid. If it is low, then there...

Related articles

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.