Ok wierd but....
When it's first started up in morning it overheats within 3-4 miles but if we catch it in time(before it gets to the redline and CEL comes on) we could floor it and it goes back down in like 2 seconds. WHAT COULD IT BE???

 

Check the coolant level in the rad when it's cold and make sure it's full.
It's also possible that your thermostat is sticking closed.

 

usually when u overheat, u can blame the thermostat. heres a quick check: next time it overheats stop the truck, open the hood and check two things. first if u got coolant coming out of the overflow res, then ur thermo is stuck closed. another common spot would be the water pump. the pump has a weep hole to allow the coolant to drain when the pumps bearings are worn. you will know its the pump when u see coolant flowing out like a stream from the pump. wait just got more ideas. if there is a white crusty corrosion around the pulleys and block then there is a hole in the rad and the fan is spreading the coolant around. also make sure the peacock is tight

 

Yeah, I'd vote for a sticking thermostat.

 

My 98" S10 Blazer had rising temperatures since I had it passed 36K miles. Don't mess around here. Avoid an OEM replacement. I bought a replacement from Summit Racing, changed the water pump too, and haven't had any problems since. These are low budget items that can save your engine.

 

might have air in the cooling system.

 

I know we have air in the cooling system cause it sounds like water bubbling when you step on the gas. How do you get the air out though?

 

try flushing the system, and try and flush the core as well.

 

you could also have a clog in the heater core causing the bubbling, but try everything else first for the bubbling, changing the heater core isn't fun

 

To get the air out, you first have to determine where the air is coming from. I would do a complete flush as suggested above. With the flush, replace the radiator cap AND the thermostat. Both are cheap items to CYA.

Look for any signs of leakage anywhere in the system. A faulty radiator cap can allow air into the system, but just to be safe, you need to check all other possibilities. Also, if you do not have the proper coolant level in the overflow tank, you could have air ingestion problems.