Heater won't get real hot.
I am having problems getting my heater to blow hot air. So far I have changed my thermostat to a 195. I'm getting hot water to my heater core and out. If I run the truck in the heated shop it blows real hot air but as soon as I move outside it starts blowing cold air. I think my problem is I'm drawing in air from outside rather than in the cab. I've heard that there is a blend air door controlled by vaccuum on the a/c model but is it the same on the non a/c models. Also do you know of a website where I could find detailed microfiche diagramns of are trucks?
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