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post #1 of 5 (permalink) Old 06-04-2010, 08:04 PM Thread Starter
Join Date: May 2010
Location: winnipeg manitoba
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I have a 2001 f-150 4.6L and heres my problem. I changed the thermostat still overheating so i changed the water pump still no luck.i was wondering if anyone out there has this problem or has had this happen to them befor.If someone could shed some light on this for me it would be great or even know what the problem is would be way better.thanks for your time
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post #2 of 5 (permalink) Old 06-04-2010, 10:38 PM
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could be multiple things

are you loosing coolant?
is there air in your cooling system?

hows the condition of your rad?
is the rad fan kicking on?

if you turn on the defrost when truck is up to temp is it hot air coming out of the defrost vents?

Any milky residue on the inside of the oil cap?
how does the engine oil look? normal? or chocolate milk creamy looking?
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post #3 of 5 (permalink) Old 06-04-2010, 11:07 PM
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Is the clutch fan working? Maybe the A/C compressor seizing? Are you running straight anti-freeze or pre-mixed?

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post #4 of 5 (permalink) Old 06-05-2010, 01:03 AM
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the thermostat isn't in backwards is it? Also check your upper rad hose to make sure it's not collapsing under load

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post #5 of 5 (permalink) Old 06-07-2010, 02:56 PM
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could be a air lock in system,check for coolant leaks and go to a shop that has a "air lift"coolant refiller

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