What is this thing?

[Jayson41]

I have coolant leaking out of this very slow but enough to notice. What is it? What does it do? How do I get it to stop leaking? It is coming from the phillips head screw there, should i just replace it? Thanks!

[ZMANN]

heater bypass used when you select max AC it blocks coolant to the heater core

u just replace it

[ZMANN]

ps it looks like the vacuum tube is off of the end of the vac canister/actuator

common

[ZMANN]

actually it looks like someone put the vac line on the back of the actuator arm??

[Jayson41]

I'm not 100% sure they are all in the right place, i do know my A/C blows cold even in the 110 degrees its been lately, the grey in color vac line was broke, and i noticed coolant dripping thats how i found the leak. I just cant find the part # for the busted part.

[Razorsedge]

Check RockAuto Auto Parts under 'heater control valve'. They have the Motorcraft part for $15.99. I had to replace mine shortly after I got the truck because it was leaking just like that. Easy replacement, no problems since.

[Razorsedge]

BTW it's Motorcraft part # 3C7Z18495AB

[ZMANN]

fix the vac line also lol

[Jayson41]

any chance i can get one of you too post a picture of yours so i can see this vac line issue your talking about please?

[ZMANN]

the gray line on top of the leaky thing goes in the front of the leaky thing