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AC Weird

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Old Jul 25, 2011 | 12:22 AM
  #1  
Utah Jake's Avatar
Utah Jake
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AC Weird

2006 F350 6.0 Powerstroke. Towing my 5th wheel, going flat roads, AC normal but as I climb hills, I start loosing cool air and it starts blowing warmer. The water and oil temps stay within 15 degrees of each other ( ECT 230 max - EOT 247 max). It seems the warmer the engine oil temp, the warmer the AC. Cool air recovers as I go down the hill and EOT cools.
I checked and the AC condenser is in front of everything. Just can't figure this one out.
 
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Old Jul 25, 2011 | 12:32 AM
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the almighty schmuck
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From: nola
is the a/c on auto ? mine does similar thingwheni have it set toauto but not when i tell it which vent to come from
 
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Old Jul 25, 2011 | 12:33 AM
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the almighty schmuck
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From: nola
Originally Posted by the almighty schmuck
is the a/c on auto ? mine does similar thingwheni have it set toauto but not when i tell it which vent to come from
damn i need a new keyboard frigging spacebar never working
 
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Old Jul 25, 2011 | 02:09 AM
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hotroddsl
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The PCM is using your heater to help cool the engine? That's the only logical explanation I can come up with! Monty is wagging his approval so I must be right....lol
Jim...& fat Monty
 
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Old Jul 25, 2011 | 09:50 AM
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230 is hotter than I think I'd be comfortable with. I think I'd check that out as well.

Try using Max A/C. That will close off the coolant flow to the heater core. That might make a small difference.

The only other thing I can think of is that the PCM is shutting the A/C compressor off above a certain coolant temp to try get cooler air over the radiator.

You might get better answers in the 6.0L Diesel forum.
 
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Old Jul 25, 2011 | 09:57 AM
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Is your fan coming on? At 230 degrees it should sound like a jet is taking off under the hood.
 
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Old Jul 25, 2011 | 02:37 PM
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1) The fan was coming on at the right temp.
2) I tried it in manual, no change.
really strange, I can't see the connection between the hills and AC. Not a loose of vac closing mixing doors since a diesel has a stand alone electric vac pump.
I will try max AC next time but I thought that just had to do with fresh air vs cab air.
 
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