I have a 2003 Lincoln aviator. Yesterday it started pouring out coolant. Today I investigated and found out that it's coming out of the reservoir cap. I have no heat, it's not overheating. But its seems like its overpressure. If I run it with the cap off and give it gas it starts pouring out of the reservoir. Coolant level rises every time engine is running
please someone help
I'm assuming you are testing this while the engine is "warming up/hot" yes? I am going to make the assumption that your cap for your reservoir is a screw on cap, if so. Then it is natural for your engine coolant to rise when the engine is running or when you rev it. Cars with the screw on reservoir caps like to maintain a certain amount of pressure after hot, Replace the cap if so. If it is not a screw on cap and just a pop off one, check the radiator cap and thermostat as there would be not enough pressure in the system causing the coolant to beat up too quickly and overflow. You can also at the same time see if there is an air bubble and if so you can burp your car once cold.
@bruceree
Um yes the motor is warm/hot, the coolant goes past the screw on cap and the car has no heat from the vents
Last time I had that something like that happen it was due to a blown head gasket.
@chucktobias
Could u explain why I have no heat after this started happening
If you have enough coolant blowing out that the level gets low it will affect the heater.
@chucktobias
But there is enough coolant but it wont stay in the system it overflows through the cap
You may have another problem such as the blend door not operating correctly or if there is a coolant shutoff valve that may have malfunctioned, or the heater core could be plugged up. A 2003 model is 18 years old now and you may be looking at multiple issues.
Have you checked the temperature of the heater hoses? If one of them is cold the coolant is not flowing through the heater core.
https://itstillruns.com/heater-core-plugged-4866753.html