Quote:
Originally Posted by Andy4639
Check the thermastat see if it even has one. A lot of people take them out during the summer to let the motor stay coolier. 
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I replaced it last week. I've been all through the heating system in the last week. Sometime before I bought the truck, a mouse had taken up residence in the heating system so I took it all apart and cleaned it all out. I just absolutely cannot get this thing to run warm, I can watch the temp gauge rise til the thermostat opens, then it drops way down.