Not sure what you're asking. A steady stream of small bubbles in the coolant recovery tank points to a leaking cylinder head gasket. There's a chemical test that can be performed at the radiator to verify that. Typically that will include losing coolant over time. Another test to verify that is to add a small bottle of dark purple dye to the coolant, then check a day or two later with a black light. The dye will show up as a bright yellow stain. If the head gasket is leaking, the dye will be found inside the tail pipe. Auto parts stores will have the correct dye for the fluid being tested, and those that rent or borrow tools should have a black light.
The milky stuff under the "Oil" cap is from water. Most commonly that is condensation from moisture in the air being pulled through the crankcase, and that builds up from too much short-trip driving when the engine doesn't reach normal temperature. The water doesn't have a chance to vaporize so it can be drawn out. Quite often you'll even see droplets of clean water under the cap. Before you get too excited over that, take the car on a good 30 - 50-mile trip at highway speed. The water condenses on the cap because that is one of the coldest parts of the engine.
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Wednesday, December 13th, 2017 AT 4:42 PM
