Here i go... To start with I rarely drive this truck. maybe once a month sometimes longer. I noticed this summer the A/C started to fade in and out. Go from cold to hot at first. Then not work at all buy the end of summer. Went to dive it this morning and the heat went from hot to cold. Then no heat, at all, after an hour drive.. WTHeck? Checked system psi, low side service port and high side all checked out fine. Could it be the interior temp sensor? Any ideas? or should i bit the bullet and drop it off at a shop for dio?