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No hot air from heater at idle?

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Old 04-14-2010, 11:29 PM
RaftWW RaftWW is offline
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No hot air from heater at idle?

Even after being fully warmed-up, the heater in my 2004 F350 6.0 doesn't put out any heat at idle. Within 5-10 seconds after driving down the road and getting the RPMs up, hot air finally comes out. Then after sitting at a light for a couple minutes, the heater blows cold air.

Any thoughts on the cause and the fix?

Thanks!
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Old 04-14-2010, 11:46 PM
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check your coolant level!
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Old 04-15-2010, 03:30 AM
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Poosible causes that I have seen:

Coolant level (as mentioned)
Slipping belt
Failing water pump
Failing thermostat

Start with checking the coolant level and inspecting the serpentine belt. Those are the easiest to inspect.
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Old 04-15-2010, 04:59 AM
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Most likely: failing thermostat.

Did you check temp gauge and is it low when you don't get cold air.

If not, if you have automatic temperature control, the problem is in the valve that regulates coolant flow.
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Old 04-15-2010, 09:48 AM
RaftWW RaftWW is offline
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Quote:
Originally Posted by redford View Post
Poosible causes that I have seen:

Coolant level (as mentioned) Just had it flushed and a new reservoir 2 months back
Slipping belt Doesn't look like it
Failing water pump Gawd, I hope not.
Failing thermostat That's what I was thinking...
Start with checking the coolant level and inspecting the serpentine belt. Those are the easiest to inspect.
Good input from all. Seems like I'll be fore-warned now when I take it to the mechanic.

Thanks!
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Old 04-15-2010, 01:43 PM
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I'll put my money on the water pump. It is a common issue on the earlier 6.0 PSD.

Well, low coolant is very common too, but a quick glance eliminates that.
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Old 12-21-2010, 12:20 PM
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Hey Guys does anyone know the outcome of this issue. (How was it repaired)
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Old 12-21-2010, 03:46 PM
RaftWW RaftWW is offline
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And the answer is...

Blown Head Gasket, Oil Cooler clogged with sand (left over from casting the block?) and low water levels!

New oil cooler, machined heads, upgraded head bolts (160 ft-lbs) and some other little things.

Grand Total: $5,300

Please don't say I got bent over the chair.
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Old 12-21-2010, 03:47 PM
RaftWW RaftWW is offline
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... and one small benefit

Fuel consumption improved up 2.5 mpg, a little consolation!
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Old 12-21-2010, 04:16 PM
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Glad to hear a positive outcome. Better mileage means a lot these days. We're paying $3.18 a gallon here, bet it's even worse on your end of the world.
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Old 12-21-2010, 07:18 PM
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As I was scrolling through the thread I was going to post head gaskets - my 03 had all of the above stuff like yours done...
... on warranty though!
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05, 2004, 60, air, belt, blows, cold, duty, f350, ford, heater, hot, idle, slipping, super, truck

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