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If the thermostat was not installed correctly, the housing can crack but it would leak engine coolant not oil.
It is possible but it depends on where the crack is. If the crack is from the combustion chamber out, such as through a coolant passage it can also suck in coolant/antifreeze and loose compression.
If the radiator is cracked then the vehicle has ran dry on coolant. This would cause the radiator to crack if there wasn't any coolant.
Check the radiator coolant level! When it is low, and RPMs decrease at low speeds or idle, the coolant isn't being circulated through the entire cooling system, such as the heater core! Be sure the engine is cool before opening the radiator cap and adding coolant! NEVER add coolant to a hot engine because it will crack the block or cause the head gasket to blow!
No It would not unless beside that plenum on your block is a crack in your heads and your leaking coolant or even leaking internally check head gaskets
Probably coolant in the oil from a blown head gasket which might also cause excessive steam from the tailpipe and hard starting. The coolant also could get into the oil through a crack in the engine block.
a crack or a hole in the tank. or hose for that matter
crack in engine block or head, so the coolant leaks through crack into oil. very common problems with engine to get cracks, maybe a design flaw or when you ran without coolant, it may overstress engine!
A crack near or on the thermostat housing can cause a coolant leak in a 1996 Grand Marquis. The thermostat housing is located near the manifold on this vehicle.
The temperature contrasts would cause differential expansion of the bottle which, being brittle, would cause the glass to crack.
A faulty thermostat in a 2001 BMW 325CI can cause a coolant leak. The coolant may be leaking out a crack in the thermostat or through a warped edge. In some cases the problem may be just a bad gasket and not actually a problem with the thermostat at all.
check your coolant level in many models the heater core is in the highest position in the water jacket. It your coolant gets low many times a bubble migrates to the heater core, when you raise the rps or are driving around (same thing) the coolant rushes through the water jacket at a much higher speed warming the heater core produceing heat. The other option would be a lever or vacume actuated heater controlled valvel that is spring retun to close, A problem can arise if vacume driven if there is a leak or low vacume the valve will close completely or somewhat. Most likely its low coolant and if you have not adjusted it in a short ammount of time you will blow your head gasket or gaskets or crack your heads costing big money.