I did a little reading here, and it led to an overwhelming amount of "issues" to check. Heres my problems:
I went up to the snow the other day, and had no problem putting the truck in 4 Hi, while driving on the snowy highway. I drove into a field (about 2' of snow), and parked. When I went to leave, the tires just spun. I noticed that only my passenger rear was spinning. I put it in N, then switched the dash selector to 4 Low. Same thing happened again. I got out, manually locked the hubs, and then my driver front, and passenger rear would spin, and the truck wouldnt go anywhere. Luckily a snow plow was passing, and he pulled me out. Once on the road, I switched back from 4 Low, to 4 Hi, and everything seemed to be just fine. It appears I have a problem with 4 Low. Im curious if its a vacuum issue (ie, pump, or leak in a line).
Part 2 of my issues, is my climate controls. Occasionally when I switch the vent on, the fan will come on full speed. I can then lower the speed manually and everything is fine. On other occasions, when I put the defrost on, the same thing (fan comes on full speed, then I have to manually turn it down). Ive also noticed that when I put the defrost on, itll kick on the a/c as well, which I have to turn off.
Due to some research here, Im thinking these two problems are related, and its most likely a vacuum issue. Is ther a way I can narrow it down to the pump, pulse vacuum solenoid, or just a leak in the lines? When i turn my ignition to "on" for the first time each day, I can hear the pump grind away for up to 45seconds, but with the noise from the engine, its hard to tell if/when it comes on while Im driving.
Last edited by mah77; 12-24-2012 at 08:14 AM.