epricedright Posted March 9, 2013 Author Report Share Posted March 9, 2013 Those sensors are known to "get stuck". I hit the reservoir from time to time and it helps. No kidding. I tried that and I think it worked....for a minute. But it came back. Tomorrow I hope to take the reservoir tank off and flush it out to clean any crud on the sensor. Q: Do I lose much coolant taking the hoses off the reservoir tank? Should I pinch off the lower hose with hose clamp pliers? Link to comment Share on other sites More sharing options...
BodybyFisher Posted March 9, 2013 Report Share Posted March 9, 2013 I don't think you will loose too much, especially if the coolant level was low as you noted. Take it out flush it, check the wires, jump the connector and you will know whats going on. Good luck with the car, and post some photos, 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...
epricedright Posted March 9, 2013 Author Report Share Posted March 9, 2013 I added Dexcool today and put it at about 1 and 3/4" below the lower ring of the neck. What is the correct amount? It took about 1/3 of a gallon. That really concerns me. And I noticed today that there is a white residue on the black insulation.that's attached to the underside of the hood. That tells me it may have overheated some time in the past....correct? I'm going to keep a close eye on the coolant level and redo that block test. I also noticed today it needs an engine mount. Just noticed the dealership had penciled in on his water pump repair receipt an estimate of $425 for a motor mount. The seller didn't divulge that....Pffft Link to comment Share on other sites More sharing options...
epricedright Posted March 9, 2013 Author Report Share Posted March 9, 2013 I don't think you will loose too much, especially if the coolant level was low as you noted. Take it out flush it, check the wires, jump the connector and you will know whats going on. Good luck with the car, and post some photos, Will do Mike. Were going to do a little detailing on her tomorrow. Do I need to upload the photos to say webshots or wherever to post them here? I'm going to use my turkey baster to get the coolant out of the tank before removing it. I was worried about coolant coming out of the hose that attaches to the bottom of the reservoir though...does that sit high enough where not much comes out? Link to comment Share on other sites More sharing options...
KHE Posted March 10, 2013 Report Share Posted March 10, 2013 If the car passed the block test, I wouldn't assume the worst unless the previous owner added a bunch of coolant before the test. Do you smell coolant as in an external leak? If the CHECK COOLANT LEVEL message is displayed and the level in the surge tank is at the proper level, it is a bad sensor. The surge tank needs to be replaced since the sensor is molded into the tank. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
epricedright Posted March 10, 2013 Author Report Share Posted March 10, 2013 If the car passed the block test, I wouldn't assume the worst unless the previous owner added a bunch of coolant before the test. Do you smell coolant as in an external leak? If the CHECK COOLANT LEVEL message is displayed and the level in the surge tank is at the proper level, it is a bad sensor. The surge tank needs to be replaced since the sensor is molded into the tank. No coolant smell anywhere and no signs of coolant leaks so far. Will keep a close eye on coolant level and leaks. Can there be a HG leak, but the coolant leaks out into the exhaust therefore fooling the block test? Link to comment Share on other sites More sharing options...
BodybyFisher Posted March 10, 2013 Report Share Posted March 10, 2013 No, combustion is muct more powerful than coolant operating pressure, combustion would get blown into the coolant passage tainting the coolant with by products. I recently used the block tester and it turned colors in 15 seconds. The only possibility is that straight coolant was in the tank, but the likelihood of that is nil. Put your nose in the tank and take a whiff. Have the cooling system pressure tested if you are losing coolant it will become obvious under pressure 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...
epricedright Posted March 10, 2013 Author Report Share Posted March 10, 2013 That's good to hear the block test is conclusive for HG failure. I hope there's no more coolant loss and maybe there was air in the system after the water pump replacement and the coolant was just never topped off. Link to comment Share on other sites More sharing options...
epricedright Posted March 10, 2013 Author Report Share Posted March 10, 2013 Newly acquired used cars sure can be a PITA! Link to comment Share on other sites More sharing options...
epricedright Posted March 10, 2013 Author Report Share Posted March 10, 2013 So what's the correct coolant level for the surge tank? There are no "FULL" marks I can see. Link to comment Share on other sites More sharing options...
KHE Posted March 10, 2013 Report Share Posted March 10, 2013 So what's the correct coolant level for the surge tank? There are no "FULL" marks I can see. My '05 Deville has a translucent surge tank and there is a "full" arrow that is molded into the translucent portion of the tank that indicates the proper level. My guess is the '03 is the same. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
epricedright Posted March 10, 2013 Author Report Share Posted March 10, 2013 I'll look again. Thanks Kevin. Link to comment Share on other sites More sharing options...
barczy01 Posted March 11, 2013 Report Share Posted March 11, 2013 Check and make sure the radiator cap gasket is intact, able to hold supplied pressure. Polish the brass filler neck on the expansion tank. Take the overflow hose and extended it and put it in a plastic coke bottle or milk jug if your thinking its a head gasket. Link to comment Share on other sites More sharing options...
airmike Posted March 12, 2013 Report Share Posted March 12, 2013 epricedright check out my new thread 'coolant sensor' for your tank . Link to comment Share on other sites More sharing options...
Cadillac Jim Posted March 12, 2013 Report Share Posted March 12, 2013 My 1997 Eldorado chrome rims are also in perfect condition. I have seen the beads and the chrome does not go past the rim, much less to the beads. I have been thinking that some of the rims that people report as having chrome all the way into the beads may have been originally pained, and chromed to increase their value or by owners who wanted to upgrade that way. Do ALL of the chrome rims of the 2001-2002 rims have chrome into the bead? -- 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...
BodybyFisher Posted March 13, 2013 Report Share Posted March 13, 2013 I have also heard that if someone ever used tire inflate/sealer that it can damage your wheels See this article on how the sealer can damage chrome wheels and MUST be cleaned out. http://en.wikipedia.org/wiki/Canned_tire_inflator 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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