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post #1 of 14 Old 10-24-2013, 08:12 AM Thread Starter
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Heater Issues

My heater is acting up. I have heat whenever I am on the throttle, but when I let off the throttle it starts blowing cold. It doesn't matter what position you have the vents blowing in. I have put the truck on a scan tool and it is showing no codes for the HVAC or anything else. Truck runs and drives normal other than the heat issue. Any help would be great.

Truck is a 2006 F350 DRW 6.0 Lariat

2006 F350 DRW Lariat 4" straight turbo back, 7" tip K&N intake
EGR Delete, oilstand pipes blue spring mod, hpop fitting, oil drain tube, dummy plugs, studs and gaskets to come soon!
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post #2 of 14 Old 10-24-2013, 01:30 PM
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I had same issue, check your coolant level, if fine, check heater bypass valve...if operating...and your truck never gets hot while towing....toasted hg's, ask me how I know


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post #3 of 14 Old 10-24-2013, 02:38 PM
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Where is this valve located I have the same issue. On the highway my ect is running about 185-190 coolant level does not change. But I sometimes have this problem.

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post #4 of 14 Old 10-24-2013, 02:52 PM
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Inline on the hose going to the heater core, should have a vacuum line attached to it. Make sure it actuates in the "off" position and the "max cool" positions


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99.5 F-350 SRW Short Bed, Ex Cab.
6637
Wicked Wheel'd,
Southbend
Autometer - Boost, Pyro
TW 6 Pos Chip
Water/Meth Inj
Diamond Eye 4" TB

7 year Veteran with SBFD
Airframe and Powerplant Mechanic
Head Marine Technician

Dont Tread on Me
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post #5 of 14 Old 10-24-2013, 02:52 PM
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There is always that notion of a sticking thermostat or bad water pump....but rarely


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99.5 F-350 SRW Short Bed, Ex Cab.
6637
Wicked Wheel'd,
Southbend
Autometer - Boost, Pyro
TW 6 Pos Chip
Water/Meth Inj
Diamond Eye 4" TB

7 year Veteran with SBFD
Airframe and Powerplant Mechanic
Head Marine Technician

Dont Tread on Me
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post #6 of 14 Old 10-24-2013, 02:56 PM
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OK I'll take a look tomorrow think my alt went bad on me today. It funny the heat if I'm on it it gets warm at idle its just over outside temp.

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post #7 of 14 Old 10-24-2013, 03:44 PM
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Quote:
Originally Posted by 04fording View Post
OK I'll take a look tomorrow think my alt went bad on me today. It funny the heat if I'm on it it gets warm at idle its just over outside temp.
Same way mine was with bad hg's


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99.5 F-350 SRW Short Bed, Ex Cab.
6637
Wicked Wheel'd,
Southbend
Autometer - Boost, Pyro
TW 6 Pos Chip
Water/Meth Inj
Diamond Eye 4" TB

7 year Veteran with SBFD
Airframe and Powerplant Mechanic
Head Marine Technician

Dont Tread on Me
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post #8 of 14 Old 10-24-2013, 03:50 PM
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I haven't had level change and oils still clean.

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post #9 of 14 Old 10-24-2013, 06:08 PM Thread Starter
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Me either. I would think if bad hg's there would be a change in level and oil, am I thinking right?

2006 F350 DRW Lariat 4" straight turbo back, 7" tip K&N intake
EGR Delete, oilstand pipes blue spring mod, hpop fitting, oil drain tube, dummy plugs, studs and gaskets to come soon!
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post #10 of 14 Old 10-25-2013, 06:19 AM
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I had trouble one time with my air conditioner doing the same way it was a bag in the vent on the passenger side in the floor vent

Last edited by doe12; 10-25-2013 at 06:26 AM.
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