Well better too much heat than none right?
Ever since I bought the truck 3 years ago, the heat was always 'on' to a degree. You can set it to vent and the temp to cold, and you'll still get fairly hot air out the vent, not just ambient temp. Same of you set it to floor or whatever. You also can't get air to one place, maybe 65% to where you want the rest goes where it wants. If the A/C is charged it will blow cold. Set to 'off' and its mostly off. This also shuts down the fan which helps too.
Even though its primarily a winter ride, I finally had enough and have decided to fix it.
The dash is pulled back from the firewall exposing everything.
Testing shows:
All the vacuum pods hold vacuum and move as they should.
The temp servo on the blend door is moving, blend door moves freely by hand with servo off. Can hear it thump on the end of its travel.
All other doors seem to move as they should.
Observation -
There is a vacuum-like hiss from under the dash when the truck is running. Goes away for a moment if you tap the throttle and continues for a second or two when you turn off the truck.
When I used a hand pump on the main supply line, it held vacuum, no noise.
Sooooo nothing looks 'wrong'
ideas?
