Compression Ignition Addict
Join Date: Jun 2013
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I had a similar issue...my temps stayed fairly even around 180 but couldn't get heat. Found my heater core was clogged...it's a $60 fix and really quite easy...there's a good "how to" video on YouTube. It's easy to check. Drop your glove box down and remove the heater core cover. With the truck warm feel the heater core. Mine was hot on top cold I the bottom. Or you can feel the heater hoses going to and from the core. The one with the vacuum valve is the in...it should be hot, the other should be about the same temp if not the core is clogged...I just replaced it since it was a cheap part, I guess you could back flush it though.
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2006 F350 Lariat
EL CAT1 coolant and coolant filter.
95k miles. Oil cooler changed at 93k.
Oversized turbo oil drain tube.