coolant leak from upper radiator hose - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 03-30-2014, 05:33 PM Thread Starter
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coolant leak from upper radiator hose

Hi recently i replaced a bad water pump and thermostat and swapped to the dual alternator upper radiator hose to bypass the serpitine belt. About 200 miles later i noticed the truck was steaming from what appeared to be the head light. After opening the hood i noticed the coolant was boiling out of the upper radiator hose where it connects to the radiator. I have no idea what happened. truck is fine for short drives like 10 miles to work. but going at high speeds or 45 mph for duration i notice the coolant is leaking and when i stop a puddle forms under the truck. it appears to be coming from the upper radiator hose by the radiator but could be else where too or just might be the fan slinging it around. please help thanks
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post #2 of 7 Old 03-30-2014, 05:51 PM
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the t-stat you installed, was it short or long shanked? need a long stem.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #3 of 7 Old 03-30-2014, 05:54 PM
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The stamped steel thermostat housing on these trucks has a reputation for leaking. I replaced mine with a billet housing from DynoProven and haven't had any further problem with it leaking. It's possible this might be your trouble.

2001 F-350, 4x4 Longbed/crew, Autometer gauges, 4" exhaust, 6637, Sinister coolant filter, F8 chip, Galaxy 3 running Torque, 278k
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post #4 of 7 Old 03-30-2014, 06:04 PM Thread Starter
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Ok this is all helpful but I was just about to upgrade to 203 degree thermostat
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post #5 of 7 Old 03-30-2014, 06:05 PM
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ya, i think your t-stat isn't opening

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #6 of 7 Old 03-30-2014, 06:34 PM Thread Starter
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would the upper radiator hose still get hot if it wasn't opening?
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post #7 of 7 Old 03-31-2014, 06:12 AM
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yup...its why when their stuck closed, the pressure/coolatn will pop the cap. Yours holding up to 16#, can take notice somewhere else before the cap shows sign

99.5 x-cab 7.3l, 6spd, 161k miles.....
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