Margarita Posted October 20, 2010 Report Share Posted October 20, 2010 Why would the big hose to radiator collapse and go flat and reshape itself after taking pressure off antifreeze cap ??? THERMASTAT sticking ???? antifreeze was good level Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 20, 2010 Report Share Posted October 20, 2010 Why would the big hose to radiator collapse and go flat and reshape itself after taking pressure off antifreeze cap ??? THERMASTAT sticking ???? antifreeze was good level That is odd and not something I have not seen Are you overheating? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Cadillac Jim Posted October 20, 2010 Report Share Posted October 20, 2010 There's a pressure relief valve in the radiator cap that is supposed to let air into the system as it cools down so that the system doesn't draw a vacuum. This is not the same one that is set to 15 psi to limit pressure in the radiator. With a sticking relief valve, or the wrong radiator cap, or a clogged relief hose, you can see collapsed radiator hoses. Make sure that the relief hose is clear and that you have the right radiator cap for your car. Any old generic radiator cap may not work properly with the particular cooling system configuration of your car. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
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