Clicking noise when I turn from cold to hot

[angelbell40]

Hello everyone I am new to the forum and looking for some assistance. This morning it was a bit chilly and when I turned the temperature from cold over to hot I heard a clicking sound. Can someone please tell me what that could be and if it is something that I can fix on my own.

I thank you in advance for any assistance in this matter as I am feeling overwhelm

 

[taranmalhi]

If the noise goes away after it warms up, look at the following things:

Exhaust Manifold Bolts on both sides (you can visually check the top ones, the bottom ones require some investigation), check your downpipe gaskets, collector pipe spring kit & gaskets.

The manifold bolts that ford used in the earlier year explorer were Cast Iron, this caused a huge headache to many people.

 

[polizi212]

It is not your manifold! It will be your blend door! Look here!

http://www.explorerforum.com/forums/showthread.php?t=323586&highlight=blend+door

Good Luck its a easy fix!