gjgogol Posted November 24, 2014 Report Share Posted November 24, 2014 i purchased a thermostat for my 2002 cad deville dhs and they sold me one rated at 180 degrees. my manual states thermostat should start opening at 188 degrees and be fully open at 206 degrees. will the 180 thermostat hurt my engine? what thermostat should i be using? Quote Link to comment Share on other sites More sharing options...
Texas Jim Posted November 24, 2014 Report Share Posted November 24, 2014 Get the right thermostat... The one rated at 180 will NOT let your engine get to proper operating temperature. Quote Link to comment Share on other sites More sharing options...
Cadillac Jim Posted November 27, 2014 Report Share Posted November 27, 2014 The proper one *is* a 180 F thermostat. It regulates the temperature of the water coming in from the radiator, mixing with the block water, and the ECT sensor is located on the rear head near the crossover, which will read about 15 F higher. I would get it from a dealer, using your VIN to match the part, and get a new gasket as they are sold separately. Make sure you don't put it in backward. Quote -- 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...
winterset Posted November 27, 2014 Report Share Posted November 27, 2014 Ironic how Leland lead the new way to use the Johannson Gauges so cadillac parts can be interchangeable. Fast forward 100 years, and we have to use a vin to get a part as common as a thermostat. I'm not criticizing anyone or anything or saying it is good or bad, just that it reveals the complexities in design that imo really accelerated starting in the mid 1990's. Quote Link to comment Share on other sites More sharing options...
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