Question

Why is overcooling in an engine is harmful?

Answer 1

heater control valve closed no vacuum or just bad, vacuum leak, thermostat defective, or stuck open or missing, restriction in heater lines, vacuum programmer in the automatic controls is defective, and or all the above what ever you did was not what was wrong with it in the first place , start over step by step and make sure no mistakes, if the thermostat was installed in correctly or up side down it would over heat OK, so kink line means restriction as well, i have read all your answers and well I can only one or two know something about colling systems but not much this is why you take to a really good mechanic these people are clueless this is why I made so much money on cooling systems they have failed the simplest test you are running cool so there is no way its a plugged thermostat, your not over heating !, the only thing working is the fan so work back wards ,controls, then firewall vacuum lines to the heater control valve when motor running use your hand safely and touch the hoses and see where the restriction is if on is hot the and one is cold then you did not take the plug out of the new core, if both are hot then its in the car the automatic controls, the leavers, its vacuum on other side of em, , are the radiator hoses warm ? its realy simple, good luck