defog thru vents
twocitfly
10-24-2008, 11:16 AM
My 1998 s-10 blazer has the defrost coming out the front vents. Actually all the air and heat is doing this. I didn't find a vacuum leak. Could it be the switch that changes from AC Bilevel vent heater & defog. I sure could use help with winter fast approaching.
MT-2500
10-24-2008, 12:06 PM
My 1998 s-10 blazer has the defrost coming out the front vents. Actually all the air and heat is doing this. I didn't find a vacuum leak. Could it be the switch that changes from AC Bilevel vent heater & defog. I sure could use help with winter fast approaching.
Welcome to AF
Auto or manual ac/heater controls?
It is usually cause by weak or no vacuum from engine to heater controls.
Get a vacuum gauge and check for weak or no vacuum from engine to heater controls and check vacuum tank and lines for unpluged or broke.
Welcome to AF
Auto or manual ac/heater controls?
It is usually cause by weak or no vacuum from engine to heater controls.
Get a vacuum gauge and check for weak or no vacuum from engine to heater controls and check vacuum tank and lines for unpluged or broke.
Automotive Network, Inc., Copyright ©2025