coolant leak

[robert740il]

2000 explorer xlt 4L sohc. losing about a pint of antifreeze a day. put in new thermostat, then water pump, then k&w nanotech block repair. as long as i do not run the heater or a/c i get no leaks. as soon as i turn either on antifreeze pours out at the spot where the a/c naturally drips when it is running. any ideas? thanks, robert

 

[Joe Dirt]

I'd guess either the heater control valve or the heater core/hoses going to it?

 

[robert740il]

thanks, i'll check those out and let you know. robert