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hi all , so its starting to get cold here in portland oregon and my 99 silvy has no floor heat at all ,the dash vents work fine , the defrost blows good but not like when i first acquired the truck, i got the truck used a year and a half ago and it worked great when i got it then it started to not work right( the heater ) could a vacuum leak cause this ? , does the heat come from the vacuum system ? should i replace the climate controls at the dash ? trying to figure out the most cost efficient way to get this fixed , any ideas would be great , thank you for the help

Robert
 

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Could be a mode actuator door not opening and forcing all of the air to the dash.
 
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