Verizon newsgroup wrote:
> I had my truck inspected & they had to replace the Idler arm. Ever
> since my 4wh H (electronic engage) clicks when I hit the button but will
> not engage. Also, I have a steep hill to climb traveling home every
> time I get close to the top my AC center vents go to defrost. I'm not
> sure if these problems are related but they started at the same time (I
> also had to have my emergency brake cable replaced for Inspection).
>
> I have taken it back to the place that worked on it and they can't find
> the cause for either problem. I bought an AC control at a junk yard
> (Grade A) didn't help the AC vent problem. Could it be the round black
> part that holds the vacuum (mounted to the hood).
>
> My plan is to have a trany shop take a look at the 4wh. I really do use
> it every day to climb my steep gravel driveway. I've had several people
> ask me what do you need 4wh for this time of year.
>
> Thanks,
> Gary

I would check the vacuum hose that feeds the actuator for the
front axle. If it is loose or broken, it could cause both
symptoms. I had an S-10 that did this. Battery gas had eaten thru
the hose. I was on a pass over the Continental Divide in Colorado
when I discovered this.