No heat 03 6.0 - Ford Powerstroke Diesel Forum
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Old 01-30-2014, 02:54 PM
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No heat 03 6.0

I know this has been beat to death and Ive tried and gone through the other threads but I have to ask.
03 6.0 2wd extended cab. I have no heat what so ever,blows cold at all times. Its bone stock,no aaftermarket parts at all.
I just replaced thermostat,checked to see if the control valve that changes from heat to defrost etc and it works.Both lines going into heater core are about the same temperature at firewall. No white residue at degas bottle and have pressure when opening cap.although the small line on top was leaking due to bad clamp and just replaced it but havent ran it yet.
I replaced AC compressor at beginning of winter when it locked up and havent had it charged yet.Water pump has been replaced. I do not have the heater control valve near the oil filler cap.Thats one thing I havent tried but dont know where exactly its located. Any ideas on what this could be? Thanks guys,sorry to beat this topic just at wits end with this thing.
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Old 01-31-2014, 01:27 PM
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Borrow or rent a vaccum filling system to fill the coolant. It could just be air bound. If you are certain that there is no air in the cooling system, get yourself a piece of clear hose, two pieces of 5/8" hard tubing and 4 heater hose clamps. Remove both hoses going into the heater core. Install the clear hose between the two removed heater hoses, effectively bypassing the heater core. Start the engine and verify flow. You should see very little, if any air, and the temp should come up quickly on the hoses. If you have good flow, its the heater core. If its all aerated, you likely have combustion gas in the coolant, ie. blown head gaskets.
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Old 01-31-2014, 03:57 PM
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Your coolant is full right? I was amazed, mine did the same thing, I put some coolant to the high mark, and BAM... hot air! I read that the blend door can also be the culprit too.. some guy on E-Bay builds new reinforced ones..
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Old 02-01-2014, 02:48 AM
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Yesterday of course I had no heat and I left control on dash in the off position. When I got home outside air temp was up to around 40 so when I parked I turned control to hot and the blend to dash and floor. Hot air came out for about 5 seconds then back to cold. This make any difference?
Also what tool do I need to disconnect the lines going to the heater core? Thanks guys!
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Old 02-01-2014, 02:11 PM
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I'd check the coolant make sure it's full, I'd also just let it idle for 10 mins with the cap off, see it that purged any air, With mine it was the thermostat was bad, after that I was good to go.
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Old 02-01-2014, 05:16 PM
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do you have a cts or other monitor to check coolant temps
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