tommysls Posted June 27, 2008 Report Share Posted June 27, 2008 Hello everyone- I need your thoughts and advice on a recent overheating issue that happened with my 1998 SLS. She has 150,000 miles. Head gaskets were replaced and timeserted at 105k. Has run great ever since except half case oil leak (about quart, quart and 1/2 a month) Ever since my headgasket problem, I always keep close watch on temperature guage. Recently while on 3 hour trip I noticed guage moving quickly towards hot while going 85 mph for some time. Upon slowing down to normal 60 mph range. the guage went back to normal. Just the other day while on highway, going 55, I passed a car ahead of me and quickly reached 80 mph and guage once again started moving towards hot (3/4 of way there). Upon returning to normal 55 speed, temperature once again returned to normal. I have no coolant leaks. Water pump was replaced at time of head gasket repair. I am thinking maybe my radiator is not working to capacity. Inspection shows normal bug dents to condenser, but radiator looks good. Maybe combination of bug dents and pellets have the radiator not working as it should??? Should I consider a radiator flush of replacement?? Appreciate any advice. Thanks Tommysls Link to comment Share on other sites More sharing options...
BodybyFisher Posted June 27, 2008 Report Share Posted June 27, 2008 Check your water pump belt and tensioner, if either is bad you can experience high speed overheating 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...
navion Posted June 28, 2008 Report Share Posted June 28, 2008 Check your water pump belt and tensioner, if either is bad you can experience high speed overheating If you find either the belt OR the tensioner bad, replace them both. A belt that has been slipping is usually due to a bad tensioner. If the belt has been slipping, it will get glazed and brittle from the heat generated by the slipping. Take Care, Britt Britt Link to comment Share on other sites More sharing options...
tommysls Posted July 1, 2008 Author Report Share Posted July 1, 2008 Thanks Guys - The belt and tensioner were both replaced about six months ago. Thanks why I'm thinking radiator. Thanks Tommysls Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 1, 2008 Report Share Posted July 1, 2008 If that is the case, check your coolant for combustion by products due to a bad head gasket before wasting money on a radiator. you can buy a tester at NAPA or have a radiator shop perform the test. A symptom of a bad head gasket is overheating at high speeds or under load. Are you using any coolant? Also check the air bleed line, while the car is idling pull its hose off the tank and a stream of coolant should pour out, if no coolant your bleed line is clogged and you have air in your system and the pump is cavitating. I would say check the cooling fans but at high speeds air is forced though the radiator. Unless your radiator is clogged and impeding coolant flow its not likely your radiator. Also made sure your coolant is 50/50 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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