Are you sure it's boiling and not bubbling through? I've seen this happen before, on other cars, and it never seemed to cause problems. I can understand if the stuff boils a little when going into the overflow because it's going from about 16 psi down to atmosphere, which decreases boiling point since it's going to a lower pressure. Stuff burns and boils faster in a vacuum, fyi. Also, check for the proper mix of 50/50 glycol/water. I suspect your ratio may be off, and it's more water than glycol.
To check compression you have to borrow or buy a tester, which any auto parts place should have. You need the kind with a length of rubber hose connecting the gauge to the adapter that threads into the spark plug holes. You can see a pix of it at www.summitracing.com by putting in the keywords "compression tester". Priced from $20.
When you use it, always crank the engine over with the starter the same number of times per cylinder. I use 4 times 'around'. With the 4 spark plugs removed, you will hear one 'pulse' on each compression stroke due to the tester being in one cylinder.
it's steam coming out the radiator, maybe you have a little tinny hole somewhere (low water level), mine was in the radiator, your car it's overheating but you still have water so the ECT keep control the fan.
check the water level in the radiator and the reservoir, also check for leaks, check you oil too.
my temp gauge are never in the middle, like 1/4, if i travel it's move up and down (thermostat) but never in the middle.
be carefull about engine temp
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