Now that it's winter -no heat - Ford Powerstroke Diesel Forum
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Old 01-05-2012, 06:01 PM
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Now that it's winter -no heat

03 with 100K. Temp gauge shows normal range. Very little heat in the cab. I hope this isn't a stupid question, but do diesels have a thermostat or am I looking at a more costly fix. Let me know before I take her to the shop. Thanks

Scott
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Old 01-05-2012, 06:08 PM
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Yep, there is a thermostat. Look for the gooseneck on the top/front of the engine, just to the right of the intake elbow (as you are standing in front of the truck, looking at the engine). Don't go to some random autoparts store and buy one, unless it is a motorcraft thermostat. These thermostats fail in the open position (99.9% of the time). The others all pretty much fail in the closed position.

Another thing to check is the black rubber hose on the passenger side sitting on top of the valve cover. There is a valve in that line. There is also a very thin gray plastic line that should be connected to the front of this valve. The valve opens and closes to direct the hot coolant into the heater core.
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Old 01-05-2012, 07:06 PM
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Yes and that little grey line has a bad habbit of comeing off. The rubber piece doesn't fit very tight.
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Old 01-05-2012, 07:10 PM
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If your temp gauge is normal I would def look at the in line valve on the heat core hose
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Old 01-05-2012, 07:12 PM
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Yeah, but the stock gauge is a royal piece of crap.
There are but 3 gauges I believe to be partially accurate on the dash. Fuel level, speedometer and tach. Everything else is a joke.
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Old 01-05-2012, 07:22 PM
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Quote:
Originally Posted by NYC F-350 View Post
Yeah, but the stock gauge is a royal piece of crap.
There are but 3 gauges I believe to be partially accurate on the dash. Fuel level, speedometer and tach. Everything else is a joke.
Yeah I here ya. Hence all the more reason why I love my edge insight and still want to add more gauges, like the fuel pressure, which I just ordered
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