well, eventually the most critical thing that can happen is the engine will seize up.
when the head gaskets blow, the antifreeze and oil begin to mix together in the engine, mainly in the cylinders. when this happens, you are getting improper mixtures of everything within the engine. this will cause you to leak oil, antifreeze, get worse gas mileage, and the engine will over heat very very easily. have the head gaskets replaced as soon as possible to save yourself from a world of trouble.
You can warp or crack a head or blow a head gasket but I'm not sure how you blow a head. More info please.
Yes, it can.
Same problem vectra heater only blowing cold checked water coolant and it was empty. Topped up now blowing hot just hope I not got head gasket probe
Probably a blown head gasket
Most likely you have a blown head gasket.
check the thermostat dude may need replacing
Yes, the Honda Civic 1.6L 4cyl
You may not see anything on the gasket. Usually a head gasket "blows" because of overheating that causes the head to warp. A gasket can be bad but there should be a visable break very often in the ring around the cylinder.
As with any hed gasket problem as long as you get to the problem early enough as to not have any further major damage happen due to driving/running the vehicle too long after the head gasket blows I would say no to a complete engine rebiuld. Oil must be drained and new oil filter replaced, cylinder head must be sent out whiile you are at it send out the good head too and have the magnafluxed for cracks, have the engine to head surface checked for cracks as well, replace as needed, install cylinder head gasket and intake gasket set retorque and or replace head bolts as per manufacturers specs....happy motoring.
I can tell you if your vehicle is a GM, it has a gasket, and it blows out, and you need to replace the gaskets as soon as possible. Hopefully the leak is only external because if engine coolant leaks internally it will do serious damage quickly.
Usually when a head gasket blows, there will be a lot of steam coming from the engine. you may also see blueish smoke or cloudy looking oil.
Take it to a mechanic nobody can tell you how to replace a head gasket over answers.com it requires someone who knows how to rebuild engines when a head gasket blows it requires the engine to be disassembled and rebuilt.