greenhornet Posted July 2, 2008 Report Share Posted July 2, 2008 Hi All, Last week my i got a message saying my Check Coolant Level. After checking, my level was full, so i suspect the sensor in the tank went bad. I also notice that since i got that message my radiator fans run continiously. Could this be because of the bad sensor? If i disconnect the battery fo a few minutes do you think will reset??? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 2, 2008 Report Share Posted July 2, 2008 Its probably a bad sensor in the black coolant tank. The sensor is not replaceable you need to replace the tank. Check the wiring connector first at the bottom. 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...
greenhornet Posted July 2, 2008 Author Report Share Posted July 2, 2008 Body by Fisher, Do you know if that would cause the fans to run constantly? Link to comment Share on other sites More sharing options...
lothos Posted July 2, 2008 Report Share Posted July 2, 2008 Is your AC on? That will make the fans run all the time. WARNING: I'm a total car newbie, don't be surprised if I ask a stupid question! Just trying to learn. Cheers! 5% discount code at RockAuto.com - click here for your discount! Link to comment Share on other sites More sharing options...
greenhornet Posted July 2, 2008 Author Report Share Posted July 2, 2008 No A/C is off Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 3, 2008 Report Share Posted July 3, 2008 Body by Fisher, Do you know if that would cause the fans to run constantly? Yes I just check my manual, section 8A-31 Cooling Fan Diagnosis (electrical), High Fan Conditions, and it states this: The PCM turns on the cooling fans at high speed if a LOW COOLANT LEVEL is detected and engine coolant exceeds 85 degrees C. The PCM switches to LOW SPEED operation once the engine coolant temperature drops below 80 degrees C. 85 degrees C = 185 degrees F 80 degrees C = 176 degrees F Hope this helps I love the Northstar system, its so logical! 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...
greenhornet Posted July 3, 2008 Author Report Share Posted July 3, 2008 great thanks for the info. Do you think taking off the bat. terminals will reset the pcm? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 3, 2008 Report Share Posted July 3, 2008 great thanks for the info. Do you think taking off the bat. terminals will reset the pcm? Not likely, check the connector at the bottom of the tank. If you find the tank too expensive take a run by your local scrap yard you might get lucky. However the only reason I would hesitate using a scrap yard tank is that it will probably be dry and could have dried out, they have been known to crack. Good Luck 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...
BodybyFisher Posted July 3, 2008 Report Share Posted July 3, 2008 Check rockauto.com and gmotors.com for parts 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...
greenhornet Posted July 3, 2008 Author Report Share Posted July 3, 2008 BBF Thank You, as alway's you are a great source of info, And the same for all other members on this board. I have followered your post on a daily basis. Thank You all for your honest information. CADDYINFO.COM FOR LIFE. Thank you Once again Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 3, 2008 Report Share Posted July 3, 2008 You are welcome, report back when you fix this to complete this thread for future users, Thanks 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...
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