I have a 2013 Chevy silverado 2500 hd with the Duramax. I am getting the the check engine light that my coolant temp is not getting up to temp. based on the info that I have found my thermostats is stuck. I am getting ready to replace the thermostats, but i can not find any info on how to burp/bleed the coolant lines. I do not see a bleeder screw as mentioned in other posts. can someone tell me how to bleed the air out of the coolant system once it is refilled?