jamesallenpylant Posted November 5, 2010 Report Share Posted November 5, 2010 New radiator and thermostat, but still loseing water could the cap be leaking and cuase it overheat.Its a 98 seville sls. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 5, 2010 Report Share Posted November 5, 2010 A bad cap won't hold pressure, and allow it to boil over yes The best way to find out what is going on is to pressurize your coolant system and look for leaks 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...
jamesallenpylant Posted November 5, 2010 Author Report Share Posted November 5, 2010 there is water around the cap and its not completly cover heating just hotter than normal. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 5, 2010 Report Share Posted November 5, 2010 The coolant tank can leak, its common as the car gets older, it will leak under pressure The best way to find a leak is to pressurize the cooling system 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...
Ranger Posted November 6, 2010 Report Share Posted November 6, 2010 Open the cap and stick your nose in the tank. What does it smell like? Link to comment Share on other sites More sharing options...
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