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My cold truck is now a sauna. The past couple of winters my 1991 Dodge Dakota didn't seem to warm up as much as I thought it should. This winter I bought one of those small thermometers you can stick into dash vents and found the air coming out was a lukewarm 90°. That was on a 40° day. No way that would be any good on a cold winter night when I get off work at 1:00 AM. I removed the heater hoses to drain the heater core. I grabbed a garden hose and flushed out the core. Didn't seem to be much dirt. Stuck a short hose on the core and put a funnel on it. Poured a quart or two of muriatic acid into the funnel and let it do its magic. Grabbed the garden hose again and flushed out the core. Lots more water flow now. Hooke up the hoses again and topped off the radiator and overflow tank. Went for a drive and the vent air was 145°! Woohoo! As Quizno's would say, Mmmm toasty! It's amazing what a little crud will do to heater efficiency.

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