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So what is the engine temp. when driving? Did you burp all the air out of the coolant system? Are you running 50/50 mix coolant? Has any type of leak fix been added to coolant? Has the coolant added always been dex-cool? Some coolants mixed with dex-cool turn into gel! Do you have headers? could be heat soak. Also if temps rise when engine running and car parked it is probably your water pump (impeller) issue. Stock thermostats start to open @ 195 degrees. @ 221 degrees f. car should start and run fine, it maybe a different issue. Have any of your ground wires been loosened if yes, check them.
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