I drive a 2007 dodge nitro and noticed that the driver side heat is not as hot as it used to be and is cooler than the passenger side heat.

I do not have dual heating controls. I notice that as you go from left to right from vent to vent it gets warmer.

Any ideas on a fix and if I would be able to trouble shoot / fix with minimal automotive knowledge.

If not, ideas on a cost estimate for repair?

Thanks!