Question about 2006 Ford F 350 Super Duty

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2006 f350 6.0 heater

Heater only blows hot when at high idle or when engine turning over 2000 rpm

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Sounds like the water pump is not performing correctly. some of the fins on the pump sometimes corrode and come off.

Posted on Jan 15, 2009

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Posted on Jan 02, 2017

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Engine idles at 1000 RPMs.At 60 MPH 2000 RPM's.Is this normal?


the 4.0L engine?
is this engine cold or hot.
why is 2000 rpm wrong for 60mph., (depends on engine and axle size and what gear you were in , then)

the idle speed for hot is too high
did you scan the PCM yet?
if hot , idle is high, is the thermostat holding water temp 180f or above. ? if not that is the problem.

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Heater temp on high only bows luke warm air after driving. A/C works just fine.Plenty of cold air from it


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Heater stopped blowing hot air. engine won't idle hen hot


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2002 Nissan Altima Cold air blows at idle but is warm at higher engine RPM


Heater core may be clogged. Try flushing it to see if water flows through freely. Also check the heater water control valve for restrictions.

Dec 15, 2017 | 2002 Nissan Altima

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Engine overheating on low rpm


Could not agree with you more - was thinking that it was a circulation problem with coolant when you mentioned your suspicions.

May 04, 2017 | 2006 Pontiac Montana SV6

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Heater blows cold air when the truck is idling or in stop and go traffice


a question to an answer: is your truck has any heat when you rev it 2000 rpm, or above?
have you check your coolant level? if level is low you have a small coolant leak, a water pump may be at fault, and causing air pockets in your heater core, check for leaks your self, dealer wont tell you if vehicle still under warranty.
good luck

Feb 03, 2011 | 2006 Nissan Frontier

1 Answer

When car picks up speed the heat blows. when u stop or slow down. cold air blows


Tell me when you speed up is the heater set on hot and high speed?????
WHEN you slow down is the fan still going at the same speed or dose it go very slow when on idle.
If the Fan stays on high but runs cold when going about 80 in top but when you speed up it gets hot and then back off slightly then its sounds like Water pump isent pumping the water around the engine correctly ,but then it should make the engine run overheated.or it could be a slipping fanbelt, but then that should make the Alternator to make a noise,so {throttle to 2000 rpm from idle standind still} and see if there's a noise coming from the water pump area.
The belt should have just a little free movement more on the longest part of the belt(a very little about 1/8' movement
So check it out and let ne know how you get on .
Ron

Nov 28, 2010 | 2003 Nissan Altima

1 Answer

2002 Wrangler 4.0 idles too high in park.


normal for an engine to start at elevated rpm and then die back as it takes a few seconds for the ECM doing it's sensor checks and idle back to the correct idle speed
check the idle rpm with an external rpm counter as most in dash units are inaccurate at rpm lower than 1000
as for the temperature
If you have a climate control module, it uses a mixture of heater and ac to maintain the temperature that you have set
so check it for operation

Nov 13, 2017 | 2002 Jeep Wrangler

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