A vacuum leak can cause the engine to idle high, but worse than that it can cause one or more cylinders to run lean. That can result in exhaust valves and pistons running at a higher than acceptable temperature and cause premature engine failure.
The intake manifold are very bad about corroding a hole in them which means that you will have to replace it.
Bad thermostat, Low on engine coolant--( coolant leak ) Cracked head, Leaking head gasket,
Intake gasket leaking on the inside of engine.
Normally oil leaking from the top of an engine is a sign that you have a leak at a valve cover. The cover may be loose or the gasket may be defective. Tighten the valve cover bolts to no more than 5 lb/ft of torque. If that does not stop the leak, the gasket will need replacing.
A head gasket does not wear out and there is no specific reason for replacing one unless it fails. Usually, head gasket failure is related to engine overheating that causes the heads to warp. Thank you, but it's not the head gasket that has broken. I had the seal replaced last year because it was cracked/leaking and leaking oil. And now the garage says it needs replacing again. Should it been leaking again so soon (after 13,000 miles)?
Sounds like water pump needs replacing The main pulley is near the top of the engine. The water pump is toward the front of the engine. It is possible that water appears to be leaking from this pulley, but there is a manifold gasket right above it. Double check to find exactly where the water is exiting the engine block. My first hunch is a leaking gasket.
If the power steering rack is leaking, it is likely an seal or a gasket. Replacing the seal or gasket should stop the leak.
The head gasket may be leaking. Try having it changed.
yes there is an "O" ring that forms a gasket under the distributer
you might have a blown head gasket and the coolant is leaking into the cylender and the engine is burning it.
leaking head gasket
Your engine may have a leaking hose connection or a leaking gasket at the water outlet. It could also be a leaking hose.