cadillacjeff7777 Posted July 26, 2014 Report Share Posted July 26, 2014 My 08 DTS has on two occasions this week been hissing when I shut the car off. The temp is elevated to maybe the next line. There's not any visable coolant coming out and I can't smell coolant but the hissing is coming from the pressure cap on the overflow. 2008 DTS with 125k. Thoughts? Quote 2008 DTS Link to comment Share on other sites More sharing options...
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