fra66le25 Posted September 4, 2014 Report Share Posted September 4, 2014 My 1997 caddy started to over heat. I replaced the radiator, water pump and thermostat. Fans kick on at the right temp both high and low. I do not see white smoke coming from the tail pipe. When engine was cold I ran water through up and lower line of the hose I have ran water through upper and low side of engine to look for blockage I have removed thermostat at this point connected all line filled cooling system with water and started motor. after starting motor and letting it run for a while I can feel that upper radiator hose get hot but No water flow lower hose I feel water flow going through. I am stumped Link to comment Share on other sites More sharing options...
barczy01 Posted September 5, 2014 Report Share Posted September 5, 2014 Overheat, what were the temperatures? Did you install any stop leak Blue Devil, snake oil? Notice any oil leaks, or rough running when the car was started in the am and then cleared up? Stick your nose when the engine is cold/warm in the overflow tank and see if it smells like gas. Link to comment Share on other sites More sharing options...
MAC Posted September 5, 2014 Report Share Posted September 5, 2014 Probably air in the system. Bleed the coolant air purge line. Link to comment Share on other sites More sharing options...
winterset Posted September 5, 2014 Report Share Posted September 5, 2014 Make sure you didnt install the thermostat in backwards. And you cannot test it with just water, you need to have the right concentration of dexcool Link to comment Share on other sites More sharing options...
fra66le25 Posted September 7, 2014 Author Report Share Posted September 7, 2014 no rough idle No smell from over flow tank I do at this time have all water. at this time there is no thermostat I have removed the upper line off the tank to bleed the system of air ( with water only) It seems to hold at the 12 o'clock and after 15 min just to 1 o'clock. I have seen the fan kick on both high and low speed While driving it will hold between 12 & 1 o'clock for temp and then just all the way over to the red. I have check all codes and nothing motor related Link to comment Share on other sites More sharing options...
fra66le25 Posted September 7, 2014 Author Report Share Posted September 7, 2014 There was blue devil installed on the motor Link to comment Share on other sites More sharing options...
fra66le25 Posted September 7, 2014 Author Report Share Posted September 7, 2014 and system is now run on GM Fluid dexcool Link to comment Share on other sites More sharing options...
barczy01 Posted September 8, 2014 Report Share Posted September 8, 2014 If your purge line is clear and Blue devil is installed someone knew there was a problem (headgaskets) Link to comment Share on other sites More sharing options...
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