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Re: Heater blows cold air at driving speeds....
Verify the heat/cold blend gate is working. You can view/adjust it by pulling the glove box.
Make sure you have a 195 thermostat. A lot of folks put a 160 in trying to fix an overheat problem and forget to change back once the real problem is fixed. The PO on my truck did that. The heater never did get very warm until I put in a 195.
Quality control on thermostats today seems poor. I have had more than one fail in a few weeks. Often the real culprit for an overheat issue.
Even hot, my radiator rarely has much pressure on it.
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