joecutlass Posted May 1, 2012 Report Share Posted May 1, 2012 (edited) 2005 impala. 3400. You can start this car, drive it as far as you want, but as soon as you shut it down and let it cool, the next time it runs, its overheating. New limg, tstat, water pump, and radiator cap. Pressure tests are fine. No air pockets. Anyone have this issue before? Any advice on what it could be? This is my friends grandfathers car and im assuming head gaskets, but a few mechanics i know say its not that because i smell no radiator fluid in the exhaust. Its not the heater core because theres no smell in the car. Edited May 1, 2012 by joecutlass Quote Link to comment Share on other sites More sharing options...
95 vert Posted May 1, 2012 Report Share Posted May 1, 2012 Try this to verify head gaskets. Very accurate. http://www.blockchek.com/ Quote Link to comment Share on other sites More sharing options...
joecutlass Posted May 1, 2012 Author Report Share Posted May 1, 2012 Block check is good. Quote Link to comment Share on other sites More sharing options...
ChibiBlackSheep Posted May 1, 2012 Report Share Posted May 1, 2012 Actually overheating, or is the gauge going bad? Can you hook up a scanner to the car and see what the actual temp is? Quote Link to comment Share on other sites More sharing options...
tornado_735 Posted May 1, 2012 Report Share Posted May 1, 2012 Actually overheating, or is the gauge going bad? Can you hook up a scanner to the car and see what the actual temp is? This, x10 Quote Link to comment Share on other sites More sharing options...
joecutlass Posted May 2, 2012 Author Report Share Posted May 2, 2012 Yea. I brought it to my friends shop today so i had all the tools i.needed to work on it. Snap on scanner. No codes. Everything is checking out fine. Ive never seen anything like this before. Quote Link to comment Share on other sites More sharing options...
rich17 Posted May 2, 2012 Report Share Posted May 2, 2012 Faulty tstat Quote Link to comment Share on other sites More sharing options...
carkhz316 Posted May 2, 2012 Report Share Posted May 2, 2012 Faulty tstat.....OR gauge/ sending unit since everything was checking out fine. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted May 2, 2012 Report Share Posted May 2, 2012 05 impalas use a single coolant temp sensor, which is read by the PCM. the PCM sends the signal to drive the cluster via class 2 data. if the coolant temp sensor is reading correctly with a scanner, but not on the gauge, it's the cluster that's the issue. Quote Link to comment Share on other sites More sharing options...
3pt1lumina Posted May 2, 2012 Report Share Posted May 2, 2012 05 impalas use a single coolant temp sensor, which is read by the PCM. the PCM sends the signal to drive the cluster via class 2 data. if the coolant temp sensor is reading correctly with a scanner, but not on the gauge, it's the cluster that's the issue. ^ This. Saw it a bunch of times at the GM dealer I was working at. Clusters seem to go bad in these all of the time. Quote Link to comment Share on other sites More sharing options...
joecutlass Posted May 3, 2012 Author Report Share Posted May 3, 2012 Its not the cluster. So far, weve gathered that it heats up, and it sits, the coolant that reaches the oveflow, doesnt flow back into the radiator. Gone through 3 new caps think maybe faulty rad cap and still same issue. Quote Link to comment Share on other sites More sharing options...
Garrett Powered Posted May 4, 2012 Report Share Posted May 4, 2012 the barb on the radiator neck was leaking on me before causing the system to lose pressure and stuff. the straw effect wouldn't work right for the overflow tank either. luckily I found it and had it braised. Quote Link to comment Share on other sites More sharing options...
joecutlass Posted May 16, 2012 Author Report Share Posted May 16, 2012 Turned out being the radiatir Quote Link to comment Share on other sites More sharing options...
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