Why do I have to put anitfrezz in my car every ten to fifty miles there is no leaks my hearter core is bad but its been needed fix n it just stared me having to put it in every ten miles

SOURCE: hearter core

If you look down by the gas pedal you will see two tubes coming out of the heater box, that is where the heater core is. To replace the heater core you need to disconnect the heater hoses from the heater core in the engine compartment. Then remove the gas pedal from the floor, and disconnect the brake booster rod from the brake pedal. Next you will need to disconnect the shaft going to the bottom of the steering column. (Make sure not to turn the steering wheel while the column is disconnected or you may damage the clock spring). After all of that is disconnected you will have to remove a cover for the heater core tubes. Then remove the tubes from the heater core. There are a couple of screws that hold the core in. Remove those screws and the heater core will slide out of the heater box.
This is not as difficult as it sounds. Just make sure and not turn the steering wheel, and top off the coolant when you get done.
Good Luck.

SOURCE: 92 acura legend heater core

dose'nt matter long as you make sure they are exactly the same but if you are going to go through the pain of changing it you should put a new one in unless you would like to do it again.

SOURCE: Heateer core leak

yes you can take the 2 hoses going to the heater core and join the 2 together under the hood so that coolant flows thru the hoses but not thru the heater core

SOURCE: why is my cars still over heating when i have put

you might also want to check for any leaks in the cooling system. whether it be hoses or gaskets such as under your water pump.

SOURCE: Put new radiator in,and no

You might consider bleeding out the air you might have in your cooling system after you opened it,drain it to replace radiator.Let it cool down open rad cap start engine watch the burps of air come up when air locks are out coolant starts to swirl as it circulates might drop fluid level to have coolant on hand to top up after wards shut it of with rad cap off let it sit for as long as you possibly can any remaining air locks will burp out.Once coolant completely down put your rad cap back be sure fluid is full reservoir as well.Now see if you have heat.