Changing fuel filter

[Hamfisted]

You can get the heater valve from Rock Auto and replace it yourself to stop the leak. You should take the coil packs off #3 & #4 and blow the sparkplug wells out with compressed air to get any coolant out of there.


https://www.rockauto.com/en/catalog...355,heat+&+air+conditioning,heater+valve,6860

 

[TexEx]

Thx gentlemen, the fuel filter replacment was quite easy today & cheap, also bought the metal connection release tool..then blew out that area where the coolant was visible in hopes to get the heater control valve to leak again just to justify purchasi g a new one...ran the truck around the block with heater going then came back popped the hood & continued to let it run...no leaking but regardless tomorrow I will pull 3 & 4 coils just to check those out & clean em up. Must admit the truck is running better but still ain't right..we all know our 5.4s very well & how they should run & sound. Conclusively, I do think one of those coils are fouled up..thx again.

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[Trainmaster]

If the water got into the well, change the plug too. The insulator can be cracked. Cheap insurance. Don't even think of a cheap Chinese coil. If you replace one, get a real one.

If the plugs have been there for 70K miles or so, just replace 'em all. You got a miss.

 

[TexEx]

In hindsight you're right should have left it alone, but it turns out I got it off quick & easy & was lucky not to break the blue plastic lock on the tank side connection..the one on there was a motorcraft which tells me it had been replaced..Im the 2nd owner but have had it since'14.. I agree, definitely not the issue ..thx

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[Jb14]

Were you able to clean the injector connection points? looked like from the picture the points were dirty which could also cause a disruption in the signal from, and to the contact points.

 

[TexEx]

Sure did, it must be a coil or plug...running better tho..do you happen to know the exact function of the heater control valve? I see a swivel like arm that compresses but have never actually seen it work..thx

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[Hamfisted]

The heater control valve just regulates hot water flow to the front heater core. It's a common leak point with age. The rear is fed unrestricted hot water. The valve defaults to the open position and closes with vacuum applied when you request cold air. There is a blend door in the front HVAC unit but the hot water valve just aids in cutting off hot water flow to the heater core to aid in providing cooler air.

 

[TexEx]

So the lever should contract when the rear air( thermostat all the way red) is on?

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[Hamfisted]

So the lever should contract when the rear air( thermostat all the way red) is on?

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No, it contracts when you request colder air. The rear temperature selection has no affect on the hot water valve. Only the front.