98 Chevy blazer LS 4.3 Heater control issue
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Joined: Oct 2014
Posts: 55
From: Vermont
98 Chevy blazer LS 4.3 Heater control issue
So my heat works great in my truck minus the fact when i go to switch the control from Blowing face/floor/defrost it only wants to blow in the face direction...Any help or input greatly appreciated....Thank you!
Last edited by Athlon2012; Mar 24, 2015 at 12:17 PM. Reason: adding pics for better description
Beginning Member
Joined: Dec 2012
Posts: 17
From: San Jose , Ca.
Check the vacuum hose under hood.
Open your hood. On the driver side up by the master cylinder, there is a
vacuum hose "t". One of the hoses runs into the fender wall. If that hose is not connected to the nipple that sticks out from the driver fender wall, you heater control will not change from defrost to floor or to face.
Open your hood. On the driver side up by the master cylinder, there is a
vacuum hose "t". One of the hoses runs into the fender wall. If that hose is not connected to the nipple that sticks out from the driver fender wall, you heater control will not change from defrost to floor or to face.
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Joined: Mar 2009
Posts: 8,453
From: Belleville, Michigan
If there is insufficient vacuum to the black vacuum line at the mode switch in the dash, your system, (manual HVAC) will default to the BILEVEL, (face & floor) position. This thread explains testing for vacuum leaks: https://blazerforum.com/forum/2nd-ge...uestion-89161/
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