Oldsmobile/Buick Repair: engine heating, head gasket problem, radiator cap

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94 Bravada V=6 with 160 k miles.
..heats up to about 240 deg..and water overflows a little from the reservoir....radiator, thermostat and fan clutch ok. Could this be a head gasket problem...and how to test for that? thanks



Answer -
Sounds like it to me.


autohelp
Would a scanner test reveal this problem? thanks
Answer -
Doesthe reservoir OVERFLOW ? The NORMAL running temperature of the engine is 220 degrees.


autohelp
The reservoir DOES OVERFLOW...and more-so with the a/c on..

Answer
You can have a test performed whereas they remove the spark plugs and put 80 to 90 lbs of continous air pressure into one cylinder at a time and look for air bubbles coming out of the top of the radiator with the radiator cap off. If you see bubbles you most likely have a head gasket problem.


autohelp