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Re: 98 Blazer climate control,vacuum bundle
It is a black vacuum hose from engine to the back of ac/heater control panel switch.
To check at control panel you may have to pull control panel out of dash.
Check all rubber and plastic vacuum lines off of engine intake.
Some have a heater vacuum line on drivers side of intake below TBI. that feeds into the vacuum tank and into firewall to heater controls.
Look for a vacuum reserve tank sometimes hid in fender area..
Some use hard black plastic lines that have a habit of breaking.
What is yours doing or not doing?
Good Luck
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Remember proper testing gives us the answer to many problems.
MT
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