I have a 2004 chevy Monte Carlo SS. It keeps over heating

210 is just about where the radiator fans will turn on, I would suggest that you get it live scanned to see exactly how hot it really is and what the ECM is seeing. It is possible that the radiator flow may still be low.

Do you think it should be cheaper to buy a radiator, I found one on Amazon for around $80.00. Getting it scan sounds $$$. The auto shop of course go a run whatever test they think to get a profit if ithey do do a scan, what ever that consist of

If it is that cheap then it would be a good idea just because of the crud you got out of it in the first place. After you get it in and all of the air out, then watch the temp and when the cooling fans turn on and continue to watch until they turn off, all of this can be done at an idle, it just takes time. On is about 210 degrees , off is about 197 degrees. HTH

I wouldn't consider 210°F excessive in the summer with the air conditioning on. Your thermostat opens at 195°F. I would suggest replacing the radiator after you're sure that all the crud is out of the block. Once you've done that and got the air out of the system fill it up with a 50/50 mixture of water and antifreeze. Use either Dex-Cool, Havoline, or All Makes/All Models for the antifreeze. Nothing else. Then drive without the air conditioning on as a test. It'll probably run right around the 200°F mark, which is normal. With the air conditioning on, 210°F, as I said, isn't excessive. In fact, if you're stuck in traffic on a summer day with the air conditioning on, the gauge may creep up to 220°F. Under those conditions that'd be considered normal as well. HTH. -Jim

also have the temp checked at the inlet and outlet... this will tell you if the rad is removing the heat..use or buy a inexpensive( IR non contact thermometer)... ALSO..There is a bleeder screw by the water pump. Open it to let the air out of the system. Close it when coolant streams out of the bleeder screw.