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San Antonio, TX
does it make the noise at idle in park or in gear or when driving down the road?
I agree with Gillespie's,have it checked! it could be a blend door actuator ( I could fill a 50 gallon barrel with all of the ones I replaced) or the door inside the plenum itself.
you will need to retrieve codes to begin diagnosis that will point you in the right direction,but I have personally replaced dozens of shift motors on these trucks.
I would check for power and ground at the switch and then power and ground at the seat motors when operating the switch.
Make sure your coolants level is good then check the temp at the inllet and outlet of theheater core hoses.could be low coolant level ;thermostat, clogged heater core or heater plenum concerns
I would do a real thorough leak test with a water hose and then inspect the interior for leaks espcially near ny control modules orfuse panels. I have seen this on other car models.
You can remove the pump without dropping the tank. I de-pin the connector of the evaporate sensor and have someone pry down on the exhaust pipe and out she'll come.
If you buy a new cylinder from ford it will not come with keys for this model. You will need to put the supplied tumblers Ianthe correct position in the cylinder for your existing keys.
These vehicles are very well known for faulty intake gaskets causing bad vacuum leaks that will cause idle problems especially When cold
Make sure the vane airflow meter's door springs open and closed, have seen these go bad.