How about a little heater help?

[soba_03]

Ok folks,

It's a 68 C10 307 auto. The heater worked perfectly earlier this year and fan was great, super strong. Now that it MUCH colder it seem that I can't get the blower out of low. It just barely blows. The heater switch is find and the levers and bushings are in tact. I can run a hot wire to the blower motor and it seems like it works perfectly. However when using the blower lever and the standard truck wireing it only blows low.

I suspect that it's the little spring (temp sensor) mounted in the heater duct behind the glove box. I can't think of it's corrct name right now.

Ok what is it's purpose? Can I bypass this "thing" and make the blower work on high and adjust my heat output with the levers? Just wondering. Tired of every night after work getting into a really cold truck and waiting forever for it to blow enough to clear frost and fog off the window.

Yes the coolant level is correct and the thermostat is correct as well.

Any help would be wonderful.

Thanks...