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Old 02-12-2014, 11:39 AM
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Question No Heat?

I have an '06 F350 with the 6.0 diesel. Here we are in some of the coldest weather in years in the Northeast and now the heat in my truck doesn't work very well at all. Any ideas where to start looking?

Unfortunately I am not that mechanically inclined. Second, this truck has costs me thousands in repairs over the last couple of year. I am hesitant to bring it to the dealer because whenever I do I spend huge amounts of money. So I am going to see what I can do myself.

Any guess would be appreciated.
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Old 02-12-2014, 11:50 AM
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We need to know more. Fan work, coolant level, etc
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Old 02-12-2014, 12:39 PM
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No Heat

Sorry to be scant on the details.

All fluid levels look good. The fan blows, and increases air pressure amounts as the desire is increased. But the air gets luke-warm at best at all speeds. With just one bar on the meter, or turned all the way up, the air is just not getting hot or very warm.

All gauges on the dash read normal and do show the truck engine temperature to be in the middle, right where it always gets too after about 10 minutes of driving in these cold temps. There are no warning lights on in the dash indicating a problem anywhere.

I don't know if it matters, but I had the egr valve, egr cooler and oil cooler all replaced in early 2012 so they are just now about 2 years old.

Please let me know if you have any other questions. Thanks for replying.
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Old 02-12-2014, 12:41 PM
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The core could be plugged. It sounds like everything else is good.
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Old 02-12-2014, 02:14 PM
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Core Plugged?

Is that something you recommend a novice try or something a person with more experience would need to look at? I don't know how many things would need to be dismantled to clean it out.

OK, I admit, I don't even know what core you are talking about. Yup, I am that mechanically handicapped.

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Old 02-13-2014, 04:32 PM
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Could be thermostat also. I don`t trust dash gauges, had no heat, dash read normal cts read 135 coolant temp. thermostat was sticking open. hope that helps.
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Old 02-13-2014, 04:48 PM
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There is a vacuum actuated valve on the passenger side of engine above the valve cover. Check to see if vacuum line is connected to it and check to see if it is moving when you raise or lower the temperature setting. Check the hoses going into the firewall to the heater core they should both be hot. Could also be the heating blend door not opening bad actuator. Sounds like you have auto climate control there is a test you can run on it to see if it and your actuator is working just don't remember what buttons to push to get it to go into self test mode. You can Google the procedure. Good luck
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Old 02-13-2014, 06:07 PM
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absolutely, check that vac line, and valve operation first
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Old 02-18-2014, 10:07 AM
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Thanks for all the info/suggestions. I will see what I can do.
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Old 02-21-2014, 07:51 PM
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I'm late at looking at this and I hope you have got it fixed. I just have one thing to add and it was mentioned in an earlier response. I did have a Ranger and I had the same thing, blew air just not warm, it was the thermostat. I finally had it looked at (not at the dealer) and someone had drilled out the inside of it and left the outer layer. Go figure, some idiot took the time to get to it and screwed it up instead of replacing. Heater worked after putting a new one in it.
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