4x4 vacuum-hub question/problem
This is the first 4x4 truck I have ever had with a manual hub, so I am not exactly clear on a couple things.
1) I was up in the SoCal mountains last week snowboarding and I engaged 4wd high. Light came on but no 4wd. I got out and switched the hubs and 4high and 4low worked. That told me I have a vacuum problem. The transfer case works fine because 4low engages right away without problem.
2) When I have the ventilation system on either on A/C or vent and I switch to 4HI it goes to defrost. Does that mean that I have vacuum at the pump but not at the front axle, or no vacuum at all?
3) I can hear the pump running when it is switched to 4HI. I looked underneath and can't find an obvious vacuum leak at the axles. Kinda confused as to what my next step is. I need to have 4wd working, but I don't really want to do the manual hub thing. I like to be able to shift on the fly.
4) Does it cause damage to drive for a period of time with the hubs locked but still in 2wd? I spend a lot of time in the mountains and sandy desert in the winter time, and the roads are often clear then snowy then clear again. I don't want to get out and switch them all the time. As for the desert sometimes the sand gets deep when I don't expect it and stopping to lock hubs is the kiss of death in sand. I can just lock them in early, but again, I don't want to screw with the manual hub thing.