Hello, since about a few months after i bought my 2004 blazer LS i noticed it would overheat. After a while it got to the point where my check gages light would come on. I eventually solved the problem by simply letting air out of the cooling system. This fixed the problem for a while. However since it started getting hot out, my engine has been overheating well over operating temp(not too high though). I also noticed that every time i top my coolant off It ends up being all dumped out by the passenger side wheel. I also noticed an oil leak that would get all over the bottom of the vehicle. If anyone knows what is up I would love to hear any ideas.

 

Find the leaks, the passenger wheel well does not house any cooling components except the reservoir on top of it inside the engine bay, you have been putting it into the radiator right? replace the radiator cap if you haven't already. Make sure the re-circulation hose is connected to the spout below the flange for the radiator cap and the line is not broken, runs directly to the reservoir inlet. also check that the drain petcoc on the bottom passenger side of the radiator is closed, i can get a picture of it tomorrow but chances are its behind the skidplate on the front, being an 04 it might still have one.

 

I second inspecting the radiator to coolant reservoir tank hose and the tank itself could be damaged. That stuff is right on top of passenger's side wheel.

 

It's not uncommon for the plastic ends on the radiator to crack over time as they get old and start leaking, especially as the system heats up and pressurizes. I've seen that happen in a few trucks.

 

My rig lost its engine and later tranny once due to that, when my father owned it before it was sold to me the sidetank blew out on an unlit bridge at night, no where to safely pull over so it overheated in several seconds and it was donefor, the heat damage later contributed to the transmission failing too...