Posted on Jan 10, 2009

Heat won't blow on floor when in floor position on 2002 chevy s10

When in floor mode the heat blows out the defrost instead of the floor

2 more comments
michael_s988 Jan 24, 2009

How to I get to the vacuum line for the heater selector switch? I have the same problem as another poster and need to replace or fix the line for floor heat. It only works right now on vent or defrost. I am hoping I do not have to take the dash apart. Any help would be great!

Thank You

mgs
japad Jan 31, 2009

I have same problem so which color vac line was it? Was the vac line the problem?
kilgtonskier Feb 26, 2009

I have a 2003 S-10 which at times blows little to no heat and at times blows normally. I also noticed when only the floor heat is on, there is also heat flow through dash ducts.

If this is a vacuum tube problem any suggests where I should look first?

Thanks!!!
michael_s988 May 11, 2010

I checked all the lines out and I did not see a tear or crack. Does anyone know what color the vacuum hose to the floor is? I seen six and they are (brown,grey, black, yellow, blue,orange ) I am getting excellent heat from vent and defroster but when I switch to floor or floor/defrost it is all defrost. It almost seem to me that the diaphragm maybe getting stuck. I am getting great vacuum on the line that I checked except the orange one located behind the glove box.

1 Answer

machinehead2

Contributor 14 Answers
Posted on Jan 10, 2009

machinehead2

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Joined: Jan 09, 2009

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Your dial in your truck works off of a small vacuum line switching the gate for flow. I had the same problem in my s10 truck and it seemed like after a minute or so i would finally work. Come to find out there was a small rip in the hose next to the dial causing a leak.

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