Where's the antifreeze leaking from? Could just be low and have no coolant in the heater core.
Verify you've got a flow restrictor in place on the inlet side of the heater core (available from Ford, or you can maybe fabricate one) to avoid blowing out your new core.
Also, might wanna verify that your blend door is operating properly. If it's not opening and pulling air through the heater core, it could be that you've either got a bad door actuator, a vacuum leak, or damaged/disconnected vacuum line going to the actuator. This can be checked before you have to go tearing everything apart for the core replacement by using a vacuum gauge, or just tracing all the vacuum lines you can see and check for any hissing sounds and such.
leaking down my passenger side exhaust...coming down the pro chamber so while the cars on i smell burnt antifreeze......
after driving the car for about 10 mins i had lost about 1/5 of the radiator fluid in the radiator...
When my heater core went in my Fox, I luckily didn't get any antifreeze in the car. It all went out the weep hole (and fogged up my windshield). I'd look for external leaks first, just so you don't put yourself through replacing a heater core if it's unnecessary. It's a huge PITA.
The blend door is the door on the blower motor that opens and closes with the selector that determines if you get heat or not.
Dude, don't be afraid to do a heater core, it isn't nearly as bad as everyone makes it seem. I just did one in my buddie's 90 Saturday and it was a breeze. A lot easier than I ever thought it would be because everyone made it seem like it was gonna be impossible.
Just go to Napa, and the part isn't even $30. Save yourself a lot of money there.
1. A flow restrictor, if you don't already have one in there;
2. Screw-down hose clamps (instead of the crappy spring hose clamps from the factory);
3. New heater hoses (if your old ones are worn at all - better now than later);
4. Couple gallons o' antifreeze;
5. Band-Aids and Neosporin for many cuts and abrasions that will surely result from pulling dash and/or reaching around behind there;
6. Six-pack of Coors Li-- ... ummm, wait. Never mind. Make that Mountain Dew or Coke.
you gonna drive your car in the snow??? dont most people in the great white north winter their mustangs?
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