Doesn't have one.
One can purchase a Chevy 4x4 almost anywhere. Whether one is looking for a new or pre-owned Chevy, local showrooms where GM cars may be purchased would offer this vehicule.
We need to know the year and engine size to answer that one.
A Chevy K5 Blazer can be purchased at many different locations including Chevy dealerships. Another option would be in sites such as eBay and Craigslist where one can find listings from individuals.
one on each cylinder bank and then before and after the cat converter. there all on the exhaust.
check out the website www.automotivehelper.com
The Owners Manual sez to be in Neutral when changing from one mode to the other.
One can buy Chevy Blazer part son Houston when one goes to the site Chevy+in+Houston. This site offers used Chevy as well as Chevy Blazer parts. Or one could go online to sites like Auto Trader.
it needs one I am very sure
there could be more than one factor it sounds like the actuator is bad or if your blazer has partial vacumm control then you could have a vacumm leak
A 1994 S10 Blazer shop manual would have what you need to perform that job. Try your local library or maybe e-bay to purchase one.
You can purchase a used one from your local salvage yard. This would be easier than building one.