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Discussion Starter · #1 ·
My truck is getting worked on by at a shop and told me that I'm missing my vacuum pump? After doing some research it appears that is you have manual locking hubs and manual 4x4 shifter on the floor (no ESOF). So my question is what does the vacuum pump do and should my truck have come with one?

BTW, I think I've driven 100K+ miles without one or it just fell off.

Thanks,
 

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it would also control the HVAC on most models like blend doors and vent positions like defrost /floor ETC

now if you had a base model with manual controls I am not sure it is used ??
 

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that explains it after the vacuum pump fell off the redundant electrical backup took over the HVAC




LOL this does explain it all
I didn't know about the electrical activation my older model is all vac

time to have some fun with the shop ?
 
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