i have a monte carlo 2003 and even tho I have checked the head gaskets which are ok...I have a new radiator, new thermostat new waterpump and sensors..it still over heats.....when I open the cap and let it gush out and fill more coolant in it it drives fine for about 100 miles and over heats again...I am sooooo frustrated...please someone help me

 

Sorry 2 read about your problem(s)...

Who did the work on your Monte ? or did you do it yourself ?

How many miles on your Monte ?

I hope one of our expert tech mechanic's see's your post & can help you (?) (I'm not one of them)...

Did you ever replace your Water Pump ? Maybe ? it's going bad & not doing what it's suppose 2 do ?

Wish you Good Luck on finding your problem & getting it fixed 4>Sure

 

what size engine do you have? you checked your head gaskets but have you checked your intake gaskets? Chevy got stupid and used plastic intake gaskets so they go bad with low miles. your coolant system may need bled out since you are flushing it and adding more coolant. air pockets can get stuck and cause it to over heat. does it over heat while your driving it down the road, or only when sitting at idle speed?

 

I agree with nightmagic. How did you check the head gaskets?