Ford Expedition not blowing heat and clicking noise

HI again
I am hoping someone can help me figure out what sounds like a loud pop in the exhaust when you start the expedition and let it warm up. Sounds like expansion and contraction pops?????
It is towards the rear of the car.
alwaysford2 helped me so much when the heater in the rear stopped. I am hoping someone can help me with this annoying noise.
Thanks

#16 of 17 2010 Expedtion passenger heat doesn't work by cmp48

Dec 12, 2012 (5:04 pm)

The passenger heater blows but not hot. The rear works fine on the passenger

side. I know you have had threads about this before but I can't find the

location of the blend door and what I have to do to replace it. From what I

have read this is probably my problem. Thanks for your input.

Replies to this message:

alwaysfords2 (Dec 12, 2012 7:47 pm)

#17 of 17 Re: 2010 Expedtion passenger heat doesn't work [cmp48] by alwaysfords2

Dec 12, 2012 (7:47 pm)

Replying to: cmp48 (Dec 12, 2012 5:04 pm)

The blend door is behind the dash. To fix it you need to remove the dash or use something like the Heater Treater that goes in through the back of the glove box

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