loosing coolant have to fill every stop

what would the rad cap have to do with anything and plus there isn't a cap on the rad only on the rez

WOW! Really! You dont know what a radiator cap does.... pitiful.!!!!!!.., Just where do you think the coolant is going?????

Bruce , you're ruining the fun! Should we tell him now , that the 'radiator cap' even on the 'overflow' is pressurized , and by increasing system pressure you also increase the 'boiling point'? ............Might be time for a 'pro'(god knows NOT me!) to have a look-see , before it blows a gasket! Good luck, be patient and OBSERVE ...you'll get it!

I understand all that but why is it only boiling out when the car is in idle like at a stop light or sign or when ever it is not moving

OK..... When it's doing its' boiling over thing , tell me this , is the system pressurized (cap on reservoir) or is the upper radiator easy to squeeze? IF it's easy to squeeze and that makes coolant come out of the overflow quicker as you squeeze it , then REPLACE the cap , with one of the correct pressure rating DEALER is best , may be more$ , but might be worth it in this case. Let us know!!!

how do i find out what pressure rating i need for a 98 ford contour se 2.5l v6 i mean it looks like the original over flow cap thats on there now

IF the fans are working??? ..One of these FOUR answers will solve your problem,, with the overheating car,, if you will just read!! If not have a combustion leak test performed to check for a head/gasket issue. Good luck and good bye!

its not over heating if you would read all the answers its just loosing coolant

you may have a small crack in radiator. plastic ones tend to do that.

GO to the DEALER and get a cap there!!! NO guesswork involved!!! good luck!

yea its been drove like 188 miles since I put the radiator in and what do you mean burped

Burp is to remove all the air from the cooling system.

I don't know how would I check that and yea I fill it about 1/3 full and after driving it a little you can hear it boiling out till nothings left

ok the level drops then after a the fans kick on then it stats to boil back up then start so boil out but never over heats and yes it is the right way and im using 50/50 mix and yes the bottom hoes is getting hot