my selection switches like the defrost and heat on my gl-10 arent working i tried changing the selection switches but that didnt work cant seem to figure it out. just thought some of you might have some ideas. thanks.

I think the selector switch uses a vacuum line from the engine in order to control the selected mode, so check the vacuum line to the selector switch.

Edited May 7, 201213 yr by Cougar

Check your vac lines on the passenger side fender. Mine did the same thing. My vac line kept comming lose so I used a zip tie and it works great..

i checked all my vac lines and they all look like they are hooked up. unless i have them hooked up wrong.

but i think they are hooked up right

Do the selected lines have a vacuum going to them?

there is a rubber plug that has vacuum fittings in the driverside foot well somewhere behind the center console. check there. also, make sure all the skinny lines from the vacuum canister are connected, and the one from the canister to the intake manifold.