Poor Heat from 2004 Explorer, and howling noise

[Mustang Mike]

Ok Guys,
I have an 04 Explorer that has virtually no heat until 20 minutes of driving. My 98 Taurus had the same problem and I fixed it with a heater core flush, see thread below. It worked amazing, does anyone have step by step instructions like I found on this forum?

http://www.taurusclub.com/forum/82-m...ml#post2131425


http://www.taurusclub.com/forum/98-s...ter-flush.html

Also have a howling noise from the vehicle, I just replaced the wheel bearing, rotors and brake pads. It drives perfect, just wondering what the noise could be. Ideas and thoughts are welcomed.

 

[Joe in NY]

probably rear differential. Very common due to fords "interesting" designers. You can throw all the money you want at fixing it, but it will always come back.

See if its goes away went you let off the gas while cruising. It should be loudest when maintaining speed, quieter accelerating, and almost completely gone when slowing down.