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coolant coming out of overflow tank

21K views 13 replies 6 participants last post by  Bernie 
#1 ·
When I'm hard on the fuel i'm getting coolant blowing out of the overflow tank cap. Anyone else having this problem??
 
#11 ·
try getting a new degass cap, cap could be bad and its a cheap first shot. Hope thats all it is
 
#12 ·
Just had a stock one doing this when towing a trailer. It was the thermostats not functioning properly. I was at a loss but there was a ssm for this particular build of truck to do with this. You have to drive the truck and watch the temps on a scanner and compare to the chart with the ssm. There are updated thermostats for certain builds of 6.4s
 
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