Cadillac Repair: Head Gasket, blown head gaskets, blown head gasket

Question
QUESTION: I have a 92 Deville, and it is running hot, one guy says it is a head gasket. When I am driving for about 15 mins on the highway it losses power and sometimes shut off. Please help

ANSWER: IS or HAS the CHECK ENGINE light ever illuminated on the dash while driving the car ?.

Overheating can be caused by:

thermostat, Water pump, Low coolant or blown head gaskets. You need to get these items tested before a diagnosis can be made.

---------- FOLLOW-UP ----------

QUESTION: I have replaced my thermostat and my water pump. How can I tell if is a blown head gasket? The engine check engine light only comes on when the car is starting then it goes out.

Answer
The most effective way is to remove all the spark plugs, Remove the radiator cap, Take your compression tester hose and remove the check valve from the bottom of the hose as it will unscrew just like a tire valve and thread it into each spark plug hole and put an air hose with about 60 lbs of pressure and attach it to your compression hose and see if coolant bubbles out of the radiator cap opening.

If it DOES, Blown head gaskets.