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  #1  
Old 08-17-2012, 12:45 PM
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What is this thing?

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!
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Old 08-17-2012, 12:49 PM
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heater bypass used when you select max AC it blocks coolant to the heater core

u just replace it
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Old 08-17-2012, 12:53 PM
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ps it looks like the vacuum tube is off of the end of the vac canister/actuator

common
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Old 08-17-2012, 12:55 PM
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actually it looks like someone put the vac line on the back of the actuator arm??
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Old 08-17-2012, 12:58 PM
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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.
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Old 08-17-2012, 01:00 PM
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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.
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Old 08-17-2012, 01:01 PM
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BTW it's Motorcraft part # 3C7Z18495AB
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Old 08-17-2012, 01:01 PM
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fix the vac line also lol
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Old 08-17-2012, 01:20 PM
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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?
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Old 08-17-2012, 01:22 PM
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the gray line on top of the leaky thing goes in the front of the leaky thing
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