heater question 70 c10

[FirstOwner69]

I Googled the forum for "high fan speed" and got a bunch of returns. I read the 2nd and 3rd. Below is a link to the results of the search. Happy reading... Incidently, my blower has never run on high, even when new, unless the ignition key is in the on position. At least, I think that's where the key has to be, but I can't double check since the truck is 150 miles away. That's not relevant though if you are saying yours isn't working on high with the engine running.

http://www.google.com/custom?domains...D%3A1%3B&hl=en