Air filter?
A coolant pressure test is used to detect a leak on the coolant system.
Coolant is typically changed every 30,000 - 50,000 miles.
Have the coolant system pressure tested, the pressure test will increase the coolant leak.
No, the oil level can affect the the oil pressure if it is too high or low. The coolant level has no connection with the engine oil pressure.
it is normal, when the coolant is hot and pressure built, the pressure cap allows the coolant to drain to reservoir to reduce pressure in the cooling system But, if it continually does this whereby the reservoir overflows and the vehicle overheats due to a lack of coolant actually in the radiator when cool, there may be an overheating problem or blown head gasket on the engine.
Have the coolant changed immediately and you will be ok.
Coolant pressure begins to rise above 0psi as coolant temp increases. The pressure cap on the radiator or elsewhere will contain this rising pressure until it reaches the preset spec. written on the cap. Then a relief valve opens, and coolant is vented to the overflow or the ground to maintain pressure. Usually about 15psi.
You could have a bad water pump causing no coolant flow, inoperable radiator fans, a coolant leak,............
Pressure in the system.
faulty pressure cap or center housing has rusted through to the outer seal ...
the cap controls the pressure in the coolant system. by allowing the system to be pressurized, it raises the boiling point of the coolant. it also controls the amount of fluid in the system, as the pressure increases it allows coolant to be diverted to the overflow to keep the pressure from blowing the hoses off.
If you are losing coolant, you probably have a bad cylinder head gasket. Too much coolant system pressure will drop your engine oil pressure.