Problem With Vents On 94 Blazer

[4 IN THE FLOOR]

Help I Have A Problem With My 94 S10 Blazer.ac Goes From Vents To Floor And Defrost When Accelerating.ihave Checked The Vacuum Lines Going To The Vacuum Ball And Replaced The Rotary Knob Vacuum Control Located Behind The Controls.ive Looked Almost Everywhere For A Vaccum Leak And Everything Looks Good.please Help?

[LeSabre97mint]

Originally Posted by 4 IN THE FLOOR

Help I Have A Problem With My 94 S10 Blazer.ac Goes From Vents To Floor And Defrost When Accelerating.ihave Checked The Vacuum Lines Going To The Vacuum Ball And Replaced The Rotary Knob Vacuum Control Located Behind The Controls.ive Looked Almost Everywhere For A Vaccum Leak And Everything Looks Good.please Help?

I would think you still have a vacuum issue some where. Goto AutoZone and rent a vacuum pump/gauge and check the vacuum moduals. Your Heater system is designed to goto defrost on default when no vacuum is present. I would put a T in the vacuum line that goes to your heater controls and run another line to the vacuum gauge. I would be willing to bet that you see a loss of vacuum. Now it's a processs of elimination of which item is leaking.

Also, you may want to post this in the Blazer location. This may be a known probem with them.

Regards

Dan