2004 Yukon A/C fine but weak heat in front

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Campi3ell

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So, this one is confusing me a bit guys, and I thought it best to bring to the group here before spending any money.

The heat in the front of my truck blows cool. A/C works fine, no problems with it since I've had the truck. From cool to arctic I'm good.

Now the heat is what I've had...troubles with. Keeping the temp around 75 the heat works for a minute or 2 and then blows cool. Changing the temperature results in little to no change at all. Changing the fan speed has little effect.

Here's the kicker...if I turn the system OFF pushing "O," the heat comes on nice and strong. (Nothing showing on the dash panel, lights off ~ system off right?)

From there, turning the dial to adjust temperature will adjust the heat up and down fine for both driver and passenger side. Strangely enough with the comfortable fan speed I use.

Now, if I push the button to adjust fan speed heat wimps out and it's lukewarm air coming out.

Is this something I should have some one look at? Should I play with it a bit more and see how to work around this? Has this happened before to someone?
 

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