I've been a stalker of this page for about a year now, since buying my 2005 5.4 Crew Cab. My biggest takeaway so far was realizing changing the spark plugs was over my head so I had it done along with the COPs.

A couple of days after the spark plug change I noticed coolant dripping under the passenger side of the truck just behind the front wheel. I've tried tracing it back, but haven't been able to locate the source yet. Any ideas??


Thanks for all the past and hopefully future help.

 

Or a heater hose leak . Possible radiator drain stuck dripping on frame running back that way . Pressure check it and get under there ,jack it way up . You can put a hose on those drains to see if that's the point of leak .

 

Hooked up the pressure with everything cooled down and couldn't find anything, and the pressure held steady. Some of the insulation around the fire wall was wet, but I think that could be from the coolant coming out of the hoses that were unhooked to reach a couple of the plugs. There were no signs of dripping from the hoses. I guess I'll just keep an eye on it for now.