There could be a crack in the block or you have a bad head gasket.
You can get a coolant system pressure test done to see if it is holding pressure up to specification. Pressure is necassary for the cooling sytem to work.
Also, have you confirmed that the cooling fan(s) are working. Make sure they come on when the engine reaches operating temperature. This should be around 200 degrees farenheit. You can get an infra-red temperture gauge for under $20 at most auto parts stores. Point it at the thermostat housing and compare it to the dash gauge and see when the fan comes on. You can also check fan operation by turning on the A/C and the condenser fan should come on rather quickly if not immediately.
If the fan does not come on, there is an electronic PCM control that acts as the realy that could be bad or the temperautre sensor could be bad.
SPONSORED LINKS
Saturday, December 2nd, 2017 AT 2:54 PM
(Merged)