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Discussion Starter #1
What could cause this? I'm leaning towards the t-stat but wanted to get some opinions before I jump into it. I'll probably start with that since it should be an easy enough task. If it's not where else should I start? First time working on a Ford so bear with me. I'm just used to my Dodge. Oh yeah its an 02 Expy with the 5.4.

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Mike
 

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that would be my guess. although, does it have electronic climate control? mine went out on my old 95 bonneville. it thought it was 20 degrees all the time, so we had no a/c, only full blast hot. maybe a short in the sensor wiring is giving it a weak signal from time to time.
 

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Discussion Starter #3
Well I swapped the T-Stat and still no luck. I'm gonna a$$ume it's the heater coil gone bad for the front heat as the rear heat still gets good and hot. Is it a pretty straight forward swap or should I take it somewhere? I'm still learning to wrench and the wife is pregnant so she needs heat pretty bad. No heat during an Alaskan winter isn't cool.

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Mike
 

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Sounds like the heater core is probably plugged then. If it is plugged, you should probably just take it somewhere, unless you are willing to remove the dash yourself. They're really not that bad compared to some vehicles, but it's a lot of bolts and stuff.
 
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