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Hello Sam, I suspect the white foam is nothing more than condensation. I would keep an eye on the foam and continue to change the oil and filter at your normal change interval.
flush your radiator first . if it appears again you need to do a pressure test .. there is a pressure tester you can screw on where your cap goes and see if there is pressure loss after pumping up the gauge. if there is possably a head gasket or leak internal somewhere
Not good! The coolant and lubricant in the engine should never come in contact with each other.
Check the oil dipstick - if it is white / foamy white - is indication of coolant entering the crankcase and mixing with the oil. This can happen if the engine block has cracked or head gasket is torn / damaged.
After the engine has been running / warmed up completely (you get full heat from the heater or thermostat indicates in the normal range), look at the tailpipe. There should be no visible "smoke." If you see white "smoke" it is probably coolant in the form of steam / water vapor and confirms the crack / head gasket issue. Low coolant / oil levels can also indicate this.
Neither problem is an inexpensive repair - but the a cracked block is usually the "point of no return" that few will fix unless the car is in great shape, low miles, etc.
I can't say without looking at it in person. A mechanic would check the radiator for excessive pressure and contaminated coolant. Its possible a cyl head is cracked and still leaking.
white foam indicates an air leak of some kind, have the system checked for possible leaks, they can add a dye when charging the system, that will point out any leaks
I would not worry till after the foam gets heavier and more frequent, then you may have a head gasket leaking. If you change your oil and check the level in the morning and there is still a foam on the dipstick I would monitor it frequently for excessive foam or swhite sludge, then worry about a leak.
The pump is low on fluid . If fluid level is a-ok check for foam and bubbles in the resvoir. If there is foam and bubbles drain and bleed the resvoir according to spec's. If after all this the pump still growles you may have a bad bearing but before you condem the pump, few more checks you can do. Before I go there lets see how you make out with the foaming and bleeding. Good luck
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