Leaking radiator fluid when defrost is on.... help?

Looks to be a vaccum controlled valve for the heater core.

i believe that is what controls how much coolant goes into the heater core...when you move the "hot/cold" mixer control, this is what it activates.

ummm i'll go look it up it leaks right were it meats that hose to the left of it and the rubber is all bubbly like it over heated think that could be why my ac doesnt work?

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Its possible. I would expect it to be more of a weak AC system though. Have you tried getting your AC recharged?

Take it to a parts store. Find the smartest looking guy you can and ask him to come outside and look at it for you. He may know what its real name is and sell you a new one.

ummm i'll go look it up it leaks right were it meats that hose to the left of it and the rubber is all bubbly like it over heated think that could be why my ac doesnt work?

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the only reason a heater control valve would make ac not work is if it was open all the time letting hot water into the core. to see if your ac works or not, you need to start the car, turn on the ac and watch the compressor to see if the clutch engages. if it does, then the only thing preventing refrigerant from getting to the interior would be a plugged orifice tube.

i already took it to auto zone and they said find the real name and then bring it back and we will see if we have it

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lmao, they are so helpful. Ill see if i can find the name of it for ya...

Slam them in the hood while repeating "NOW DO YOU KNOW WHAT ITS CALLED???"

Either you'll catch a charge or get some help.

see if thhere is a pn on it, should should start with a F

The seal inside the heater vac. control valve is bad. Also could be why your a/c isnt working. Turn the truck on and a/c on and let it idle, see if the output of the air changes from colder to hot without turning the heat on, thatll tell you.

looks like it to me...do a physical side by side to make sure though when you get it

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Heater-Valve-Factory-Air_15490015-P_394_R|GRPCOOLAMS_888884589___