97e150 need help,no heat, tried everything

[popo007]

this is my 1st post,hello to all ,and thanks in advance my heater stopped blowing hot air,i 1st flushed cooling system,installed new thermostat correctly,has proper amount of coolant,all vacumn lines look ok,took off the control switch for hot and cold,opened that up all looks good,still no hot air,temp gauge reads normal,so I am completely stumped,please help, does anybody know where the 3 wires on the back of the control dial for hot, and cold go to ...

[goon]

if the engine is warm then two posible problems one did you have heat before you flushed if so then there might be something in the heater core try taking the lines off the heater core and use a hose and back flush the core.
if it happened before the flush stasrt the van up get it up to warm and with the fan on low, then take the temp knob and go from hot to cold and back to hot ( try doing this with the snap of your wrist) do several times then leave it on hot see if you have hot air if so get a new temp switch they are cheap.

[BroncoJoe19]

There should be a couple of vacuum actuators that move doors around within your ductwork. One is for the blend door. Make sure they are moving. It is possible to have a vacuumleak within the actuator and that will cause it to not function.