While a blown head gasket *can* cause overheating, other possibilities include:
* Coolant leaks: Check your coolant level. Low coolant, regardless of where the leak is (hose, radiator, water pump), will cause overheating.
* Radiator problems: A clogged radiator, faulty radiator fan(s), or a malfunctioning thermostat can prevent efficient cooling.
* Water pump failure: A non-functioning water pump won't circulate coolant, leading to overheating.
* Thermostat stuck closed: This prevents coolant from flowing through the radiator.
* Low engine oil: This can lead to increased friction and heat.
* Faulty fan clutch: If the fan isn't engaging properly, the radiator won't cool sufficiently.
How to determine if it's a head gasket:
Overheating *with* a blown head gasket often presents *additional* symptoms, such as:
* White smoke from the exhaust: This indicates coolant is entering the combustion chamber.
* Sweet-smelling exhaust: Coolant has a distinct sweet smell.
* Milk-chocolate colored oil: Coolant mixing with oil changes the oil's color and consistency.
* Low coolant level without obvious external leaks: The coolant might be leaking internally into the engine.
* Compression test showing low compression in one or more cylinders: This is a more definitive test that should be performed by a mechanic.
What you should do:
1. Let the engine cool completely before attempting any further checks.
2. Check the coolant level. Add coolant if necessary (after it has cooled) but only use the correct type specified for your Cadillac's engine.
3. Inspect the radiator and hoses for leaks. Look for any visible cracks, holes, or signs of coolant.
4. Check the engine oil for milky coloration.
5. Examine the exhaust for white smoke.
6. If you have any doubts, take your Cadillac to a qualified mechanic. They can properly diagnose the issue and recommend the necessary repairs.
Running the engine at high RPM for an extended period stresses the engine significantly. Even without a pre-existing problem, it could have exacerbated an existing minor issue, leading to the overheating. A mechanic will be able to determine the root cause.
