Overheating, drop in oil pressure when coming to a stop
My car has 204000 miles.
My car has an automatic transmission.
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:
You have enough oil.
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.
How to Identify and Fix Common car Problems ?
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Without sufficient oil pressure, your car`s engine will operate with decreased lubrication and increased friction resulting in more heat. Engine overheating can be a complex issue. While it doesn`t always mean low engine oil pressure, low engine oil pressure can lead to an overheating engine.
If it`s really low or actually empty, you need to add fluid to your vehicle. While it`s ideal to add a 50/50 mix of coolant and water (or a pre-mixed coolant), if you absolutely have to keep driving, you can add water to the radiator to get you to your destination.
If the level of oil in your engine drops, then it becomes harder for the oil pump to continue to manage consistent oil pressure.
The compressor is the part of the AC that pressurizes and heats the refrigerant gas. The refrigerant absorbs heat from the house as part of the cooling process. Therefore, if your AC overheats and the compressor is damaged, the AC won`t cool your house efficiently.
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I recommend having a certified mechanic, such as one from YourMechanic, come to your location to perform an inspection to determine why the Oil Pressure Light is on.
If you’d like, a YourMechanic certified mechanic can come to your home or place of business to inspect the vehicle and perform an oil pressure light is on inspection to diagnose the vehicle and suggest potential repairs.
It sounds like you may have a dirty or faulty idle air control valve that may causing the fluctuation in your idle at stops. As a result of the low idle, the oil pressure will also drop since the oil pressure sensor is designed to pick up a specific amount of oil pressure based upon normal idle RPM’s when at idle. I would suggest testing the idle control valve to check resistance by doing the followng: disconnect the IAC valve, connect an ohmmeter to pins 2 and 3 of the valve. If you get a resistance value between 10-14 ohms, this indicates IAC valve is working as it should. Next, connect the ohmmeter to pins 1 and 2. If you do not get a resistance value between 10-14 ohms, the IAC valve may need to be replaced. If you need further help with this, please do not hesitate to contact us here at YourMechanic as we are always here to help.