I have a 2004 Chevy S10 Blazer 4x4 and it started to overheat yesterday as I was stuck in stopped traffic. once I started moving again the temperature went back to normal, it drove fine all the way home but once I stopped in my driveway and let it idle for just a couple of minutes i the temperature started climbing quickly again. What could be the issue?

Thanks

 

Cooling fan. At idle it should be running. I am not familiar with what we have for fan clutches but that is where I would look.

 

I'm assuming you have a fan shoud installed? I discovered how important a fan shroud can be with my 68 Mustang. Without it, overheating while idling on any summer day. With it, no more.

 

Perhaps this is too obvious but the coolant level should be checked.

 

first replace the thermostat and get a " fail-safe" if you can , then warm it up and see if that helps , if not squeeze the upper rad hose and you should feel the pressure , if not and it squeezes easily ,make sure the engine is fully warm , but then your looking the water pump , cheapest and easiest stuff first though .,