Should I have constant pressure in coolant?
Hi, I am new here and in need of some advice if anyone can help.
The HG went on my 75 1.8 and I replaced it with the multi layer gasket. I have now noticed that the cooling system is under constant pressure, even when it has cooled down. If I take the expansion cap off and release the pressure, after a short run at normal temp. the top hose is under pressure, as I would expect when hot. But when the engine is cold the pressure is still there, even if the car is not used for a few days it remains under pressure. It does not appear to be losing water (some forces its way out when i remove the cap, when cold.
I have not had this car long and have not had a K series engine before so I don't know if this is normal or if, as I suspect, combustion gasses are getting into the coolant. There are no signs of oil in the water or vice versa since the HG was replaced.
Any help/advice on this would be greatly appreciated.