都总结好了, 就这样写给卡公司, 除了coolant overheating will not trigger check en

coolant overheating will not trigger check engine light, 值得商榷。我推理, Coolant overheating will lead to engine overheating,  then will trigger the light. 

强调一下, 有check engine light,一定有诊断吗。 都没有给诊断码, 就是忽悠人。