not unless there is a significant color change in the oil,
might be because of when the oil leaving the engine air is hitting it called aeration
The engine coolant drain plug on a Mitsubishi V6 engine is located on the bottom of the radiator. This allows for coolant to be quickly and easily drained.
From air trapped in he block of your engine. If you recently drained your coolant air is trapped in the system. You will need to bleed all air from the cooling system. If you have not recently changed the coolant this is a sign of a blown head gasket. Other symptoms are white smoke from the exhaust, loss of coolant with no apparent leak, oil level overfull, and a white foamy substance under the oil fill cap. Stop driving the vehicle unit this is repaired.
Let it settle. You maybe fooled about the bubbles if your are checking it while the fluid is hot. At rest with the engine cooled down, there wouldn't be any bubbles. Check the coolant level when engine is cooled off and not running.
The engine block coolant drain plug on 4.3 liter Chevy Blazer is located on the bottom of the engine, near the oil filter. It allows coolant to be completely drained from the block during maintenance.
With engine and radiator drained, it's 3.5 gal give or take a bit
Cold engine. Remove the radiator cap, top it off, start the engine, add coolant as necessary until all air bubbles stop escaping.
Until it cools down, which will be an indication that the coolant has depressurized.
you have a blown head gasket .
The plastic coolant reservoir on the fender feeds directly into the coolant system. Just add coolant to the reservoir and if you have drained the coolant or otherwise emptied the system, you may need to check the level in the reservoir after running the engine, or more accurately, after the engine has cooled. Once the coolant level has stabilized, just check it periodically to make certain that the coolant level never gets too low.
Loss of coolant with no visible leak. White smoke out the exhaust. Excess pressure and bubbles in radiator.
It is normal to boil when you turn the car off. When the coolant stops flowing, the coolant in the hot engine boils and pushes steam out of the engine. The recovery tank collects the excess and allows it to go back in when the engine cools.
This could be an indication that the engine coolant level is low. Check the fluid level when the engine is cool or take it in to get serviced. Low coolant allows air into the system and the sensor will read that the engine is hot.