2008 F-250 Noise Under Pssenger Floorboard

[Mikej2244]

I hate these mystery noise threads as much as anyone but now I need some help. I have a noise on my F250 under the passenger side floorboard driving me bananas. Took it in and the dealer says it is probably one of the heater actuators and normal.

I agree that it might be a heater actuator, I only notice it when the heater is on but it cannot be normal. It is a clunk that I can both hear and feel through my feet at idle or at speed and happens frequently, like every 60 secomds or so. Blower motor, actuator, something. Anyone else have this issue and can confirm its normalcy or give me something to check myself?

Taking the truck back in today becaise even though they said they replaced the water/fuel seperator sensor module I am still getting the drain message every time I drive the truck. Hopefully they will figure that one out and I will again show them this clunking noise but maybe you experts can help me out more than they can.

[shaston]

I have the same sound and it also only occurs when the heat is on. Sounds like a damper is opening and closing. I have not brought it to the dealer yet. Please let me know what your dealer says.

Shawn

[Mikej2244]

2 Different dealers have now told me it is just the built up pressure and the heater actuators around...normal. Sure is fricking loud. I hate it.

[shaston]

I have the same noise when i run the heat and I hate it too. I have not been to the dealer about it, but I will mention it on my next visit.

[greggara]

It is most likely the outside air actuator behind the glove box. I have the same noise. It can be alleviated by unplugging it.