adallak Posted February 13, 2011 Report Share Posted February 13, 2011 Okay, I have noticed that the first time I changed the coolant and now I can confirm that again - adding a tube of Bar's Leaks Golden seal powder (same stuff comes in tablets and is recommended by GM) raises the coolant temperature in LT1 engine by some 6-7 F. Probably the viscosity of coolant changes or there is more restriction in narrow passages resulting in lower flow rates. The engine temperature on a highway is around 174F with no supplement and is around 181F with supplement. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Texas Jim Posted February 14, 2011 Report Share Posted February 14, 2011 Interesting... I never would have thought it would make any difference. But isn't 174F TOO COOL?? I thought they were supposed to run at around 190 or so. Link to comment Share on other sites More sharing options...
93SixtySpecial Posted February 14, 2011 Report Share Posted February 14, 2011 But isn't 174F TOO COOL?? I was thinking the same thing. Is that an OE temp thermostat? That reminds me of yesterday when I was looking at thermostats on oreillyauto.com. They "claimed" that it was an OE temp and said 180 degrees yet the AC delco ones below it were 190 or 195 (I don't recall which). -Dusty- 2006 Cadillac DTS Glacier Gold Tri-Coat with 175,000 miles 1993 Cadillac Sixty Special Gold Mist with 185,000 miles Link to comment Share on other sites More sharing options...
adallak Posted February 14, 2011 Author Report Share Posted February 14, 2011 Interesting... I never would have thought it would make any difference. But isn't 174F TOO COOL?? I thought they were supposed to run at around 190 or so. Jim, it is a small block Chevy LT1 V8 5.7 liter engine. The thermostat is stock 180F. Never experimented with my 4.9 engine. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Texas Jim Posted February 14, 2011 Report Share Posted February 14, 2011 Interesting... I never would have thought it would make any difference. But isn't 174F TOO COOL?? I thought they were supposed to run at around 190 or so. Jim, it is a small block Chevy LT1 V8 5.7 liter engine. The thermostat is stock 180F. Never experimented with my 4.9 engine. Oh... ok... Yep..SBC are supposed to be at 180. Link to comment Share on other sites More sharing options...
BodybyFisher Posted February 14, 2011 Report Share Posted February 14, 2011 Just a thought but...is it possible that Water Wetter was added and you flushed it, reportedly it can drop your coolant temp as it sheds heat more efficiently. The guru never said the supplement raised the temp in my memory http://www.redlineoil.com/Products.aspx?pcid=10 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...
adallak Posted February 14, 2011 Author Report Share Posted February 14, 2011 Just a thought but...is it possible that Water Wetter was added and you flushed it, reportedly it can drop your coolant temp as it sheds heat more efficiently. The guru never said the supplement raised the temp in my memory http://www.redlineoil.com/Products.aspx?pcid=10 The records show the dealer changed coolant when they replaced the water pump. I do not think a dealer would add Water Wetter. Besides. I have changed coolant several times without adding Water Wetter. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
BodybyFisher Posted February 14, 2011 Report Share Posted February 14, 2011 Interesting I misread your first post, I thought you said this was the first time you changed the coolant Was the supplement required for the 5.7? According to this, it has a cast iron block and cylinder heads, maybe that has something to do with it http://motorera.com/cadillac/cad1990/CAD95F.HTM 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...
adallak Posted February 15, 2011 Author Report Share Posted February 15, 2011 Interesting I misread your first post, I thought you said this was the first time you changed the coolant Was the supplement required for the 5.7? According to this, it has a cast iron block and cylinder heads, maybe that has something to do with it http://motorera.com/cadillac/cad1990/CAD95F.HTM Mike, the FSM says the supplement is a must. I frequent Impala SS forum The same powertrain), and the folks up there get rid of supplement not to clog the heater core! lol The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
BodybyFisher Posted February 15, 2011 Report Share Posted February 15, 2011 Well then you BETTER stop using it, it seems that you have had a bad experience along with others 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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